Langyou Chemical
PRODUCTS
Retention Aid
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HS Code |
603838 |
As an accredited Retention Aid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Retention Aid: Packed in 5 - kg bags for easy handling and storage. |
| Storage | Retention Aid chemicals should be stored in a cool, dry place away from direct sunlight and heat sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Store it separately from incompatible substances, like oxidizers or acids. Ensure proper ventilation in the storage area to avoid the buildup of potentially harmful vapors. |
| Shipping | Retention Aid chemical is shipped in sealed, corrosion - resistant containers. Special care is taken to prevent spills during transit. It's transported by approved carriers following strict chemical shipping regulations to ensure safety. |
Competitive Retention Aid prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please call us at +8615371019725 or mail to sales7@bouling-chem.com.
We will respond to you as soon as possible.
Tel: +8615371019725
Email: sales7@bouling-chem.com
Historical Development
It is very interesting to study the art of Retention Aid and observe the evolution of its history. The ancient papermaking, I have not heard of the name Retention Aid, but craftsmen have used it secretly in the pulp processing room. Or add various things to increase fiber aggregation, although it is not the precise formula of today, it has already taken its embryonic form.
It has caught the modern world, technology has advanced by the day, and the paper industry has flourished. Retention Aid has been widely known since the beginning. The developers have studied the material properties and used chemical methods to make exquisite additives. At the beginning, the effect was not perfect, but after repeated trials, the ingredients have been improved, and the effectiveness has gradually become apparent. Today's Retention Aid has a wide range of categories, according to the needs of papermaking, each has its own strengths, and has made great contributions to the prosperity of the paper industry. The changes in its history, from ignorance to clarity, from crude to refined, all depend on the unremitting efforts of craftsmen and scholars.
It has caught the modern world, technology has advanced by the day, and the paper industry has flourished. Retention Aid has been widely known since the beginning. The developers have studied the material properties and used chemical methods to make exquisite additives. At the beginning, the effect was not perfect, but after repeated trials, the ingredients have been improved, and the effectiveness has gradually become apparent. Today's Retention Aid has a wide range of categories, according to the needs of papermaking, each has its own strengths, and has made great contributions to the prosperity of the paper industry. The changes in its history, from ignorance to clarity, from crude to refined, all depend on the unremitting efforts of craftsmen and scholars.
Product Overview
Retention Aid is also an auxiliary agent for papermaking. Its properties can make the fibers and fillers better attached, stay in the paper, and increase the uniformity and strength of the paper. In ancient papermaking, fibers and fillers are easy to lose, and the quality of paper is difficult. Today there is Retention Aid, which is applied to the pulp, stirred evenly, and can quickly develop. Or a polymer, with the principle of electric charge attraction, poly fibers and fillers. Or with a special structure, in the shape of a network, solidify both. With this auxiliary, the production efficiency of paper can be increased, and the consumption of materials can be reduced. It is a good tool in the paper industry, making paper products more beautiful and important to the industry.
Physical & Chemical Properties
Retention Aid is related to the physical and chemical properties of substances and is very important in various industrial applications. Its physical properties, such as morphology and particle size, are related to the mixing and dispersion of other substances. If the particle size is uniform, it can be evenly distributed in the system and play a better role.
Its chemical properties, such as active groups, determine the interaction with other substances. With specific active groups, it can form chemical bonds or strong interactions with fibers, fillers, etc., enhancing the effect of Retention Aid.
Furthermore, solubility is also the key. Only when it is well dissolved in the application system can it fully contact the object and realize its function. Soluble, it can be evenly dispersed in the solution, and it can be efficiently combined with the material to improve the retention performance. Retention Aids the Physical and Chemical Properties of Substances.
Its chemical properties, such as active groups, determine the interaction with other substances. With specific active groups, it can form chemical bonds or strong interactions with fibers, fillers, etc., enhancing the effect of Retention Aid.
Furthermore, solubility is also the key. Only when it is well dissolved in the application system can it fully contact the object and realize its function. Soluble, it can be evenly dispersed in the solution, and it can be efficiently combined with the material to improve the retention performance. Retention Aids the Physical and Chemical Properties of Substances.
Technical Specifications & Labeling
Today's Retention Aid products, its technical specifications and identification (product parameters) are the key. Looking at its technical specifications, it is necessary to accurately determine various indicators, such as the proportion of ingredients, physical properties, etc., so that the details are correct and suitable for use. On the logo, the product parameters should be clearly identifiable, and the information contained in the efficacy and scope of application should be conclusive and clear to people. In this way, the technical specifications and labels can be obtained in the right way, so that this Retention Aid product can be used by the industry and play its due effect, so as not to have the risk of misuse and misuse, so as to achieve the state of excellence. It is also in line with the ancient way of governance and industry. Only by being prudent and sure can you become a tool.
Preparation Method
"Method of Making Retention Aid"
Retention Aid, the auxiliary used in papermaking, is related to the quality of paper products. Its production method is quite critical.
The selection of raw materials should be based on high-quality natural polymers and synthetic polymers. Natural ones such as starch and vegetable gum, synthesizers such as polyacrylamide and the like. When preparing, the natural raw materials are finely ground to make the particle size uniform; the synthetic raw materials are polymerized at a suitable temperature and catalyst according to precise proportions.
The production process requires control of the reaction conditions. In the reaction kettle, adjust the temperature, pressure and reaction time. Heat up to a specific degree to fully react the raw materials, and then condensate, filter and purify to obtain a pure product.
The response steps should also be appropriate. According to the needs of paper products, different concentrations should be prepared. Add it at a specific stage of the papermaking process, stir well, and ensure that it is fully combined with the fiber.
Activation mechanism, by means of physical or chemical means, to improve its activity. Physics such as ultrasonic treatment, chemistry adds activators to make it play the best retention effect, so as to obtain high-quality Retention Aid.
Retention Aid, the auxiliary used in papermaking, is related to the quality of paper products. Its production method is quite critical.
The selection of raw materials should be based on high-quality natural polymers and synthetic polymers. Natural ones such as starch and vegetable gum, synthesizers such as polyacrylamide and the like. When preparing, the natural raw materials are finely ground to make the particle size uniform; the synthetic raw materials are polymerized at a suitable temperature and catalyst according to precise proportions.
The production process requires control of the reaction conditions. In the reaction kettle, adjust the temperature, pressure and reaction time. Heat up to a specific degree to fully react the raw materials, and then condensate, filter and purify to obtain a pure product.
The response steps should also be appropriate. According to the needs of paper products, different concentrations should be prepared. Add it at a specific stage of the papermaking process, stir well, and ensure that it is fully combined with the fiber.
Activation mechanism, by means of physical or chemical means, to improve its activity. Physics such as ultrasonic treatment, chemistry adds activators to make it play the best retention effect, so as to obtain high-quality Retention Aid.
Chemical Reactions & Modifications
In the field of chemistry, the chemical response and modification of Retention Aid are very important. In the past, there have been many explorations on it, but there are still unknowns.
Husband Retention Aid, in different chemical environments, responds differently. Or combine with other substances to form a new structure, and its properties also change. This chemical response can adjust its characteristics, such as viscosity and stability.
As for modification, it is by means of chemical methods to change its inherent properties. Or add functional groups, or modify molecular structures to suit diverse needs. After modification, Retention Aid is used in many applications, making it more effective and can be used in papermaking and pharmaceutical industries to improve the quality of products.
However, the road to exploration is not achieved overnight. It is still necessary to study its chemical mechanism in detail, and to clarify its response and modification rules in order to make good use of it and seek more benefits for industry and scientific research.
Husband Retention Aid, in different chemical environments, responds differently. Or combine with other substances to form a new structure, and its properties also change. This chemical response can adjust its characteristics, such as viscosity and stability.
As for modification, it is by means of chemical methods to change its inherent properties. Or add functional groups, or modify molecular structures to suit diverse needs. After modification, Retention Aid is used in many applications, making it more effective and can be used in papermaking and pharmaceutical industries to improve the quality of products.
However, the road to exploration is not achieved overnight. It is still necessary to study its chemical mechanism in detail, and to clarify its response and modification rules in order to make good use of it and seek more benefits for industry and scientific research.
Synonyms & Product Names
Although the name Retention Aid is not included in the "Compendium of Materia Medica", the discussion of synonymous terms related to it is also very interesting. Looking at the art of papermaking today, in the preparation of pulp, there is a thing that can help the retention of fibers and enhance the strength of paper. This thing may be called "retention aid", and its effect is to make the fibers better retained in the papermaking process and not easily lost. Although the ancient papermaking, although there is no such precise term, there must be a way to achieve a similar effect. Or use natural things, such as some plant slime, which can bond fibers, similar to today's Retention Aid. Although the names are different in ancient and modern times, the purpose of improving the retention of fibers is also the same. Therefore, exploring the ancient papermaking skills and understanding the modern papermaking chemistry is also a lot of inspiration.
Safety & Operational Standards
Retention Aid Product Safety and Operating Specifications
Retention Aid is also a papermaking retention aid. In the papermaking industry, it is related to the quality of paper products, and its use is quite heavy. When using it, you must follow safety and operating specifications to ensure that everything goes smoothly.
Safety is the first priority, the first protection. When using Retention Aid, you must wear appropriate protective equipment, such as gloves, anti-goggles, etc. This agent may be irritating to the skin and eyes. If you touch it accidentally, rinse it with plenty of water quickly. If you feel unwell, seek medical attention. And its storage is also exquisite. It should be placed in a cool, dry and ventilated place, away from fire and heat sources, to prevent it from deteriorating or causing danger.
Operating specifications should not be ignored. Read the manual carefully before use to know its performance, dosage and usage. When mixing the liquid, measure the drug and solvent with a precise measuring tool according to the specified ratio, mix slowly, and stir continuously to promote uniformity. Apply to the pulp, control the timing and speed, so that the drug is evenly dispersed, and achieve the best retention effect. After operation, clean the equipment used to prevent the corrosion of the equipment caused by the residue of the drug or affect the next use.
Furthermore, regularly check the equipment to ensure that it is running well and avoid the leakage or improper use of the agent due to equipment failure. Operators also need to be regularly trained to be familiar with new standards and technologies to improve the standard of operation. In this way, strict adherence to Retention Aid product safety and operating standards can ensure both safety and efficiency in the papermaking industry.
Retention Aid is also a papermaking retention aid. In the papermaking industry, it is related to the quality of paper products, and its use is quite heavy. When using it, you must follow safety and operating specifications to ensure that everything goes smoothly.
Safety is the first priority, the first protection. When using Retention Aid, you must wear appropriate protective equipment, such as gloves, anti-goggles, etc. This agent may be irritating to the skin and eyes. If you touch it accidentally, rinse it with plenty of water quickly. If you feel unwell, seek medical attention. And its storage is also exquisite. It should be placed in a cool, dry and ventilated place, away from fire and heat sources, to prevent it from deteriorating or causing danger.
Operating specifications should not be ignored. Read the manual carefully before use to know its performance, dosage and usage. When mixing the liquid, measure the drug and solvent with a precise measuring tool according to the specified ratio, mix slowly, and stir continuously to promote uniformity. Apply to the pulp, control the timing and speed, so that the drug is evenly dispersed, and achieve the best retention effect. After operation, clean the equipment used to prevent the corrosion of the equipment caused by the residue of the drug or affect the next use.
Furthermore, regularly check the equipment to ensure that it is running well and avoid the leakage or improper use of the agent due to equipment failure. Operators also need to be regularly trained to be familiar with new standards and technologies to improve the standard of operation. In this way, strict adherence to Retention Aid product safety and operating standards can ensure both safety and efficiency in the papermaking industry.
Application Area
Today there is Retention Aid, which is widely used. In the papermaking industry, it can increase the aggregation of fibers, make the paper uniform and strong, help retain fillers, reduce the consumption of raw materials, reduce pollution in water, and achieve environmental protection. In the paint, it can stabilize its quality, prevent sinking and separation, make the coating uniform and beautiful, and use it. In the field of printing and dyeing, it also has its ability to promote the attachment of dyes, uniform and firm color, and improve the quality of dyes. It can be seen that Retention Aid is of great use in all industries, and it cannot be ignored by the industry. If it is used well, it will increase the efficiency and make the industry prosperous.
Research & Development
Since modern times, the art of papermaking has been improving day by day, but the problem of pulp fiber loss has not been well solved. Our generation has devoted themselves to research, hoping to break it. Retention Aid is also a potion to help keep fibers.
At the beginning of this research, there are many difficulties. The choice of raw materials and the adjustment of formulas need to be cautious. After countless attempts, you can find a clue or two.
Looking at the results now, Retention Aid has improved the retention rate of fibers, and the results are gradually becoming apparent. It can reduce resource waste, reduce production costs, and be environmentally friendly. However, the road ahead is still far away, and if you want to push it widely, you still need to strive for refinement. In the foreseeable future, this potion can shine brightly in the paper industry, contribute to the development of the industry, solve the difficulties of fiber retention, and promote the long-term progress of the paper industry.
At the beginning of this research, there are many difficulties. The choice of raw materials and the adjustment of formulas need to be cautious. After countless attempts, you can find a clue or two.
Looking at the results now, Retention Aid has improved the retention rate of fibers, and the results are gradually becoming apparent. It can reduce resource waste, reduce production costs, and be environmentally friendly. However, the road ahead is still far away, and if you want to push it widely, you still need to strive for refinement. In the foreseeable future, this potion can shine brightly in the paper industry, contribute to the development of the industry, solve the difficulties of fiber retention, and promote the long-term progress of the paper industry.
Toxicity Research
There are Retention Aid products today, which are related to toxicity research, and the matter is very important. After further research, I will carefully investigate its quality, study its nature, and want to understand its toxicity.
Looking at the system of this product, the materials used are worthy of careful review. Its formation, or its contents, or its changes, must not be ignored. Test it with ancient methods, put it in various environments, observe its response, measure its changes, and record its conditions.
After years and years, I have obtained all kinds of data. It is still said to be stable in normal circumstances; when it encounters abnormal circumstances, or changes, there is a risk of toxicity. Although there is no major disaster, the slight changes should not be ignored.
In the follow-up research, we should scrutinize it in more detail, widely adopt various methods, and investigate it in depth. It is necessary to clarify the authenticity of its toxicity, so that those who use this product can check it, ensure the safety of everyone, and do not cause damage.
Looking at the system of this product, the materials used are worthy of careful review. Its formation, or its contents, or its changes, must not be ignored. Test it with ancient methods, put it in various environments, observe its response, measure its changes, and record its conditions.
After years and years, I have obtained all kinds of data. It is still said to be stable in normal circumstances; when it encounters abnormal circumstances, or changes, there is a risk of toxicity. Although there is no major disaster, the slight changes should not be ignored.
In the follow-up research, we should scrutinize it in more detail, widely adopt various methods, and investigate it in depth. It is necessary to clarify the authenticity of its toxicity, so that those who use this product can check it, ensure the safety of everyone, and do not cause damage.
Future Prospects
Looking at the product of Retention Aid, think about the future prospect. Today's technology is new, and this product has made its mark in the industry. Although the current application is still limited, its potential is profound. In the future, it may be able to use the improvement of materials science to optimize performance and apply its capabilities in many fields. In industrial manufacturing, it may improve product quality, reduce costs and increase efficiency; in scientific research and exploration, it may become a key help to promote breakthroughs and innovation. And the wind of environmental protection is growing, if it can fit the green concept, it will be more promising. When the technology is mature and the application is expanded, Retention Aid will surely shine on the stage of the times and draw a new chapter in the future.
Where to Buy Retention Aid in China?
As a trusted Retention Aid manufacturer, we deliver:
Factory-Direct Value: Competitive pricing with no middleman markups, tailored for bulk orders and project-scale requirements.
Technical Excellence: Precision-engineered solutions backed by R&D expertise, from formulation to end-to-end delivery.
Whether you need industrial-grade quantities or specialized customizations, our team ensures reliability at every stage—from initial specification to post-delivery support.
As a leading Retention Aid supplier, we deliver high-quality products across diverse grades to meet evolving needs, empowering global customers with safe, efficient, and compliant chemical solutions.
What are the main components of Retention Aid?
Retention Aid, an auxiliary used in papermaking, aims to improve the retention rate of fibers and enhance the quality of paper. Its main components are complex and have various characteristics and effects.
The first is natural polymer, such as starch. Starch is a common energy storage polysaccharide in plants. It is specially modified during papermaking to enhance the bonding force between fibers. Its molecules contain many hydroxyl groups, which can be connected to the hydroxyl groups on the surface of the fiber by hydrogen bonds, so that the fiber interweaves more tightly and improves the retention rate. And can improve the physical properties of paper, such as enhancing the strength of paper.
In addition, synthetic polymer, polyacrylamide is common among them. According to the ionic characteristics, it can be divided into cationic, anionic and non-ionic. Cationic polyacrylamide can attract negatively charged fibers by electrostatic attractive force, forming an adsorption layer on the fiber surface, promoting fiber flocculation and improving retention. The anionic type is often matched with cationic additives to optimize fiber retention through charge neutralization and bridging.
In addition, inorganic particles are also important components of Retention Aid, such as bentonite. Bentonite is a clay mineral with good adsorption and expansion. In the papermaking system, it can be adsorbed on the surface of fibers and polymers to build a denser network structure, improve the connection between fibers, improve the retention effect, and improve the uniformity of paper.
There are also indispensable retention aids in the retention aid system, such as the combination of cationic starch and bentonite. The synergistic effect of the two, cationic starch is first adsorbed on the fiber, and bentonite is then adsorbed on it to strengthen the connection between the fibers, accelerate the dehydration process, improve the retention rate and water filtration performance, which is of great significance to the efficient production of papermaking. The components of Retention Aid cooperate with each other to improve the quality of paper and optimize the papermaking process, playing a crucial role.
How to Use Retention Aid Properly
Retention Aids, retention aids are also used in the papermaking process to improve the retention rate of fibers and fillers. If you want to use it properly, you should follow the ancient principles as recorded in "Tiangong Kaiwu".
Although "Tiangong Kaiwu" does not directly describe retention aids, its method of papermaking can be used for reference. At the beginning of papermaking, the preparation of materials needs to be fine. Cut bamboo and hemp, you must choose good materials, wash and pound, so that the fibers are uniform and fine. This is like the application of retention aids, when the material characteristics, fiber length, thickness, type of filler, and particle size are known in advance, they are all related to the effectiveness of retention aids.
After soaking and drying, when copying paper, there should be a way to apply retention aids. The dosage cannot be exceeded or lacking. Excessive amounts of paper will cause many diseases, such as reduced strength and difficult water filtration; lack of paper will cause poor retention, damage to materials and sewage. When seeking the appropriate amount with a small trial, it is like a light boat testing the water at the beginning, and slowly explore it.
In addition, the method of applying medicine is also important. Or enter when beating, or add it before the Internet, depending on the state of the fibers and fillers. If you enter when beating, you can get in touch with the fibers as early as possible. If you add it before the Internet, you can respond quickly and help keep it in time. This is like marching and setting up an array, and the timing and location are all important.
In addition, environmental factors should not be ignored. Water temperature and pH value all affect the activity of retention aids. The water temperature should be suitable, the cold agent is difficult to dissolve, and the activity is easy to lose when it is hot; the pH value needs to be adjusted, and different additives have appropriate acid and alkali environments, such as grass and wood when it rains, and each has its place.
In short, with Retention Aid, when using the ancient papermaking prudent attitude, check the material, control the dosage, choose the opportunity, and take into account the environment, so that you can get good paper, and make good use of this agent.
How Effective Retention Aid Is in Different Settings
Retention Aids are also related to the retention of pulp fibers in the papermaking industry, which affects the quality of paper products greatly. Its effect varies depending on the environment, and the following is a trial discussion.
In a warm and humid environment, the molecules of retention aids are active and can quickly interact with fibers and fillers. For example, in a warm and moist place in the south of the Yangtze River, in a summer workshop, the air humidity is about 60%, and the temperature is around 25 ° C. Retention aids can adhere to fibers and fillers by means of hydrogen bonds, electrostatic attractive forces, etc. At this time, the fiber network structure is stable, the filler is not easy to dissipate, and the paper product has good uniformity and strength. Looking at the handwritten sheet, it can be seen that the fibers are evenly distributed, without agglomeration or vacancy, and the burst resistance and tensile strength are good.
However, if the environment is dry, such as the paper mill in the northwest desert, the air humidity is often less than 30%, and the molecular diffusion of the retention aid is limited. Although the dosage is as usual, it is difficult to fully combine with the fibers and fillers. The bonding force between the fibers is weak, the filler is easy to lose, the uniformity of the paper is poor, and the strength is also reduced. The copied paper has visible holes and spots, which are easy to break when used.
As for high temperature environments, such as tropical regions, where the temperature exceeds 35 ° C, the stability of the retention aid is challenged. Its molecular structure may change and its activity decreases. At this time, it is difficult to add the retention aid to achieve the expected retention effect. Fibers and fillers are easy to flow away with water. The net part of the paper machine filters water quickly, but the retention rate is low. The paper products produced are uneven in thickness and poor in physical properties.
In the high-salt environment, if the coastal paper mill uses seawater treatment or recycled water with high salt content, salt ions and retention aids compete for the check point on the fiber surface. The adsorption amount of retention aids is reduced, and the retention function is greatly reduced. The retention of fillers in paper products is less, which affects whiteness and opacity, and the stiffness of paper products is insufficient due to poor fiber bonding.
From this perspective, environmental factors have a profound impact on the effectiveness of Retention Aid. Operators should observe changes in the environment and adjust the selection, quantity and use of retention aids in a timely manner in order to achieve optimum results and produce high-quality paper products.
What are the advantages of Retention Aid compared to other similar products?
Retention Aid, in the art of papermaking, is also an auxiliary for increasing fiber retention. Compared with other similar products, it has a number of advantages.
First, efficient retention can make fibers and fillers better retained when the paper is formed. Like the ancient sieve, a fine sieve can keep small things, and Retention Aid is like a delicate sieve, which allows more papermaking raw materials to be retained on the paper, improving the strength and evenness of the paper product. Other materials may be kept inefficient, resulting in the loss of raw materials and poor quality of the paper, and Retention Aid can avoid this risk.
Second, good filtration assistance. In the papermaking process, dehydration is essential, which can promote water to quickly separate fibers and fillers, such as a boat traveling in water, unimpeded. Compared with other products, it may cause dehydration to be slow, and paper drying is time-consuming, while Retention Aid makes water filtration efficient, improves papermaking efficiency, and saves energy consumption, just like a good boat helps a boat to run quickly.
Third, stabilize the operation of the paper machine. It can reduce the disorder of fiber flocculation and make the fiber distribution uniform. In the operation of the paper machine, it is like a stable car, which is smooth and smooth. If other things make the fibers disordered, it is easy to cause the paper machine to fail and damage the equipment, while Retention Aid keeps the paper machine stable and protects its long-term operation.
Fourth, it has a wide range of adaptability. It can be compatible with a variety of papermaking chemicals, such as the ruler of medicine, and coexist harmoniously to promote the improvement of paper products. Compared with other products, or with other things, the effect is difficult to show, while Retention Aid is widely compatible and can play a good role in the papermaking system.
In summary, Retention Aid has significant advantages in papermaking compared with other similar products in terms of retention, filter assistance, machine stabilization, compatibility, etc., and is a good choice for the papermaking industry to improve quality and enhance efficiency.
What is the shelf life of Retention Aid?
The shelf life of Retention Aid is also related to the usable time limit of this object, which is extremely important. However, if you want to know the geometry of its shelf life, it cannot be directly referred to in "Tiangong Kaiwu".
"Tiangong Kaiwu" is a collection of ancient Chinese craftsmanship and technology. The book details the methods of creation and the properties of materials. However, the name of Retention Aid is not its inherent title, so it is difficult to find the exact record of its shelf life.
Although the ancient craftsmanship is not explicitly stated in the word "shelf life" today, it also has an understanding of the timeliness of materials. In terms of material preservation, the ancients were well aware of the influence of many factors such as environment and season. For example, certain ingredients, pigments, fabrics and other materials are properly stored according to the season and climate, so as to prolong their availability.
In ancient creations, materials are used in a timely manner, and the quality is changeable over time. If it is a common sense, if Retention Aid is a type of auxiliary retention material, its shelf life should depend on its material, production process and storage conditions. If it is made of grass and wood, or the shelf life is short due to perishability, it may vary from several months to half a year under suitable storage conditions; if it is refined with gold and stone, its properties may be stable, and the shelf life may be slightly longer, or up to several years. However, these are all speculative words, because there is no exact basis for "Tiangong Kaiwu", it is difficult to determine its accuracy. In general, in order to know the exact shelf life of Retention Aid, it is necessary to study it carefully according to its specific material, production and preservation. It cannot be hidden by ancient books.
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