Styrene Maleic Anhydride Copolymer Used in Plastics Enhancing Performance Across Industries

2025-03-12

Introduction

Styrene Maleic Anhydride Copolymer (SMA) is a high-performance copolymer formed by the polymerization of styrene and maleic anhydride. With its unique combination of properties, SMA is widely used in the modification and enhancement of various plastics, improving their performance in critical applications. Whether you're in automotive, electronics, packaging, or construction, SMA plays an essential role in delivering durable, heat-resistant, and high-strength plastic materials.

At Yangchen Tech, we specialize in manufacturing high-quality Styrene Maleic Anhydride Copolymer that meets the specific needs of various industries. Let’s dive into the advantages and applications of SMA in plastics.

Styrene Maleic Anhydride Copolymer

What Makes Styrene Maleic Anhydride Copolymer Special?

SMA is well-known for its exceptional characteristics, which make it an ideal additive for modifying plastics, especially engineering resins. The key benefits of using SMA in plastics include:

Improved Heat Resistance:
SMA increases the heat distortion temperature (HDT) of plastics, allowing them to withstand higher operational temperatures without degrading. This is particularly important in industries like automotive and electronics, where materials need to perform under intense heat.
Enhanced Adhesion:
SMA has excellent adhesion properties, which makes it ideal for coatings and adhesives, enhancing bonding strength and durability.
Increased Mechanical Properties:
The incorporation of SMA can improve the tensile strength, impact resistance, and hardness of plastics. These enhancements make the materials more suitable for high-performance applications.
Chemical Resistance:
SMA improves the chemical resistance of plastics, making them more resistant to degradation from exposure to chemicals and solvents.
Compatibility with Other Polymers:
SMA is highly compatible with a variety of polymers, including ABS, PVC, polyolefins, and polyamides. It helps improve the overall properties of polymer blends, resulting in materials that are more durable and reliable.

Basic Information

Test Item	Test Standards	Test Data
Molecular weight and distribution	GPC	Mw=12~16*104.PDI=2.0~3.0
Glass transition temperature/℃	DSC	160~210℃(Adjustable)
Initial decomposition temperature/℃	TGA	395-405℃
Density	ASTM-D792	1.00~1.15g/cm3
Appearance	NG	Off-white powder

Applications of Styrene Maleic Anhydride Copolymer in Plastics

Automotive Industry:
In the automotive sector, SMA is used to enhance the properties of plastic components that are exposed to high temperatures, such as interior parts, under-the-hood components, and exterior trim. Its heat resistance, mechanical strength, and compatibility with other materials make it an ideal modifier for automotive applications.
Electronics and Electrical Applications:
SMA is widely used in the manufacturing of high-performance plastic housings, connectors, and insulators for electronic and electrical devices. It increases the material's ability to endure high temperatures and resist electrical stresses, which are common in electrical components.
Packaging:
SMA is used to improve the properties of packaging materials. Its increased chemical resistance ensures that the packaging remains intact even when exposed to harsh chemicals, oils, or moisture. Additionally, its enhanced tensile strength and impact resistance make it ideal for protective packaging.
Construction Industry:
In the construction industry, SMA-modified plastics are used in various applications like pipes, roofing materials, and insulation. The copolymer's ability to withstand weathering and high temperatures ensures that these materials maintain their strength and longevity over time.
Coatings and Adhesives:
SMA is frequently used as a modifier for coatings and adhesives due to its excellent adhesion properties. It enhances the bond strength, making it ideal for applications such as automotive paints, adhesives in packaging, and surface coatings on electronics.
Consumer Goods:
SMA is used to improve the performance of plastics in consumer goods such as kitchenware, toys, and household appliances. Its ability to improve the durability and heat resistance of plastics makes it an ideal choice for products that need to withstand everyday use and high temperatures.

Why Choose Yangchen Tech for Styrene Maleic Anhydride Copolymer?

High Purity and Consistency:
Our SMA copolymers are manufactured to the highest standards of purity, ensuring that our products deliver consistent performance in all applications.
Custom Solutions:
At Yangchen Tech, we understand that each industry has unique requirements. That’s why we offer customized SMA formulations to meet your specific performance and processing needs.
Cost-Effective:
We are committed to providing high-quality SMA at competitive prices, helping our customers optimize their production costs while maintaining exceptional product quality.
Experienced R&D Team:
Our in-house research and development team continuously innovates to improve the performance of SMA and develop new applications across various industries.
Reliable Global Supply Chain:
With our well-established global distribution network, we ensure timely delivery of SMA to customers around the world.

Styrene Maleic Anhydride Copolymer manufactured by Yangchen Tech offer superior heat resistance, mechanical strength, and compatibility with a range of materials. At Yangchen Tech, we are proud to manufacture high-quality SMA products that enhance the performance of plastics in automotive, electronics, packaging, and many other industries.

If you're looking for a reliable supplier of Styrene Maleic Anhydride Copolymer, look no further than Yangchen Tech. Contact us today to learn more about our SMA solutions and how we can help improve the performance of your products!

#Heat resistant modifier for ABS #Styrene Maleic Anhydride Copolymer #Styrene-NPMI-MAH Copolymer ABS heat resistant modifier agent #abs heat resistant modifier

What is a pall ring used for?

2025-03-07

Pall Rings are primarily used in packed towers for the following applications:

Gas Absorption
- Removing impurities or specific components from gas streams (e.g., CO₂, H₂S, SO₂ removal in flue gas desulfurization).
- Example: Scrubbing acidic gases in chemical plants.
Distillation
- Separating liquid mixtures based on their boiling points (e.g., in the petrochemical industry for refining crude oil).
Stripping
- Removing volatile components from liquids (e.g., stripping ammonia from wastewater).
Heat Transfer
- Serving as a medium in cooling towers or heat exchangers to improve heat transfer efficiency.
Chemical Reactions
- Enhancing contact between reactants in catalytic or reactive distillation processes.

#pall ring #metal pall ring #316L pall ring #25mm pall ring #304 pall ring #50mm pall ring

Can polyacrylamide be used in cosmetics?

2025-03-07

Yes, polyacrylamide (PAM) can be used in cosmetics, but you need to pay attention to its specific functions and safety specifications. The following is the key information of the comprehensive search results:

1. The role of polyacrylamide in cosmetics

Moisturizing and film-forming: Polyacrylamide can absorb moisture, increase the water content of the stratum corneum, form a protective film, and reduce skin moisture loss.
Antistatic: It reduces static electricity generated by friction through hygroscopicity and improves the feel of product use, especially in hair care and skin care products.
Stable formula: As a binder and stabilizer, it helps other ingredients to be evenly dispersed and extend the shelf life of cosmetics.
Absorption cleaning: It can absorb oil and dirt on the surface of the skin and assist the efficacy of cleaning products.

2. Safety and potential risks

Acrylamide monomer residue problem: Polyacrylamide itself is highly stable, but acrylamide monomer (neurotoxin and potential carcinogen) may remain during the production process. International standards strictly limit its residual amount (such as the EU requires that the residual amount of acrylamide in cosmetics is ≤0.1mg/kg).
Skin irritation: Some people may be sensitive to polyacrylamide, and long-term use of high-concentration products may cause dry skin or allergic reactions.
Usage suggestions: Choose a regular brand to ensure that the product meets safety standards.

3. Avoid direct contact with damaged skin or mucous membranes.

If redness, swelling, itching, etc. occur after use, stop using it immediately and consult a doctor.

III. Typical application scenarios

Skin care products: such as lotions and creams as thickeners and moisturizers.

Hair care products: used for anti-static and smooth hair.

Cleaning products: assist in absorbing oil and improving cleaning effects.

Polyacrylamide has multiple functions in cosmetics, but the purity of raw materials and production processes must be strictly controlled to reduce the risk of acrylamide residues. Consumers should pay attention to the product ingredient list and safety certification, and reasonably choose and use related products.

#PAM Anionic Polyacrylamide Water Treatment Chemicals #Anionic Cationic Nonionic Water Treatment Chemicals #Reliable Anionic Polyacrylamide Flocculant Paper Making Chemicals #Flocculant Sewage Sludge Treatment 100% Pure Powder #Ultra High Molecular Weight Dry Powder Anionic Polyacrylamide #Flocculant Anionic Polyacrylamide (APAM) PAM

What are the main raw materials of anionic polyacrylamide?

2025-03-07

The main raw materials and synthesis-related components of anionic polyacrylamide (APAM) are as follows:

1. Main monomer raw materials

Acrylamide (AM): As a basic monomer, it forms a polyacrylamide skeleton through polymerization reaction. Acrylamide is usually prepared by catalytic hydrolysis of acrylonitrile.

Acrylic acid (AA) or sodium acrylate: used to introduce anionic groups (such as carboxylic acid groups) through copolymerization or hydrolysis reaction. For example, in the copolymerization method, acrylamide is directly mixed with acrylic acid/sodium for reaction, while in the hydrolysis method, carboxyl groups are generated by reacting polyacrylamide with alkali (such as NaOH).

2. Auxiliary raw materials

Initiator: An oxidation-reduction system such as potassium persulfate is used to start free radical polymerization.
Alkaline substances: Such as sodium hydroxide, which is used to catalyze the conversion of amide groups into carboxylic acid groups in the hydrolysis process.
Other additives: May include stabilizers (to prevent the polymerization process from being too fast), solubilizers (to improve solubility), etc.

3. Synthesis method

Copolymerization method: Directly mix acrylamide and acrylic acid/sodium monomers for copolymerization to generate anionic polyacrylamide in one step.

Homopolymerization followed by hydrolysis: first synthesize polyacrylamide homopolymer, and then introduce anionic groups by alkaline hydrolysis.

4. Influence of raw material selection

Raw material purity directly affects the molecular weight and solubility of the product. For example, impurities will reduce the efficiency of the polymerization reaction.

The monomer ratio (such as n(AM)/n(AA)) affects the charge density and application performance of the final product.

5. Related derivative raw materials

If other processes (such as inverse emulsion polymerization or precipitation polymerization) are used, solvents (such as white oil) and emulsifiers may be involved.

If you need specific raw material ratios or process optimization details, please refer to the synthesis case literature.

#Cationic Nonionic PAM Manufacturer Oil Drilling #Anionic PAM Manufacturer Paper Making #Polyacrylamide Anionic PAM Manufacturer #Anionic Cationic Nonionic PAM Manufacturer Sedimentation Chemicals #Anionic Cationic Nonionic PAM Manufacturer Sand Washing Chemicals #Hot Sale Anionic Polyacrylamide Flocculant

What is the difference between pall rings and intalox saddles?

2025-03-06

Pall rings and Intalox saddles are both types of random packing used in industrial processes to enhance mass transfer in packed columns. However, they differ in design, performance characteristics, and specific applications. Here’s a detailed comparison:

Design:

Pall Rings:

Shape: Cylindrical with an open structure and internal struts.
- Surface Area: Provides a high surface area due to the internal and external geometry.
- Material: Made from metal, plastic, or ceramic.
  
  Intalox Saddles:
- - Shape: Saddle-shaped with a contoured surface and open structure.
  - Surface Area: Offers a large surface area due to the saddle shape.
  - Material: Typically made from ceramic, plastic, or metal.

Performance Characteristics:

Pall Rings:
- Efficiency: High mass transfer efficiency due to excellent gas-liquid contact.
- Pressure Drop: Low pressure drop, making them energy-efficient.
- Capacity: High capacity for gas and liquid flow.
- Mixing: Promotes turbulent flow, enhancing mixing and mass transfer.
Intalox Saddles:
- Efficiency: High mass transfer efficiency with good gas-liquid distribution.
- Pressure Drop: Very low pressure drop, even lower than pall rings.
- Capacity: High capacity, often higher than pall rings.
- Mixing: Provides uniform liquid distribution and good mixing.

Applications:

Pall Rings:
- Suitable for a wide range of applications, including distillation, absorption, and stripping.
- Often used in processes requiring high efficiency and low pressure drop.
Intalox Saddles:
- Ideal for applications requiring very low pressure drop and high capacity.
- Commonly used in distillation, absorption, and other mass transfer operations, especially in processes where minimizing energy consumption is critical.

Advantages:

Pall Rings:
- Robust design with high durability.
- Versatile and suitable for various industries and processes.
Intalox Saddles:
- Excellent liquid distribution and low pressure drop.
- High capacity and efficiency, making them suitable for large-scale operations.

Summary:

While both pall rings and Intalox saddles are effective in enhancing mass transfer, the choice between them depends on specific process requirements. Pall rings are known for their robustness and versatility, while Intalox saddles are preferred for their superior liquid distribution and extremely low pressure drop. Selecting the appropriate packing can optimize process efficiency and reduce operational costs.

#pall ring packing #pall ring #intalox saddles #metal intalox saddles

what's the difference between support plate and hump support?

2025-03-06

Support Plate:

Design:
- Flat or slightly curved plates with openings (holes, slots, or grids) to allow the passage of gas and liquid.
- Typically made from metal, plastic, or composite materials.
Function:
- Primary Role: To provide a stable base for the packing material and distribute the weight evenly.
- Flow Distribution: Ensures uniform distribution of gas and liquid across the packing bed.
- Drainage: Allows liquid to drain effectively while preventing excessive hold-up or flooding.
Applications:
- Used in both random and structured packing systems.
- Suitable for a wide range of industries, including chemical, petrochemical, and environmental.
Advantages:
- Simple and robust design.
- Provides excellent support and drainage capabilities.

Hump Support:

Design:
- Curved or arched plates with a "hump" shape, often with openings for gas and liquid flow.
- Made from materials such as metal or plastic.
Function:
- Primary Role: To support the packing material while minimizing pressure drop and improving liquid distribution.
- Enhanced Drainage: The hump shape facilitates better liquid drainage and reduces the risk of liquid pooling.
- Gas Flow Optimization: The design allows for smoother gas flow, reducing resistance and energy consumption.
Applications:
- Commonly used in columns with high liquid flow rates or where minimizing pressure drop is critical.
- Ideal for applications involving random packing.
Advantages:
- Improved liquid and gas distribution compared to flat support plates.
- Lower pressure drop, leading to energy savings.
- Reduces the risk of flooding and channeling.

Key Differences:

Design:
- Support plates are typically flat or slightly curved, while hump supports have a distinct arched or hump-like shape.
Pressure Drop:
- Hump supports are designed to minimize pressure drop more effectively than flat support plates.
Liquid Drainage:
- Hump supports offer better liquid drainage due to their arched design, reducing the risk of liquid hold-up.
Application Specificity:
- Support plates are more versatile and widely used, while hump supports are often chosen for specific applications requiring optimized flow and drainage.

Comparison Summary:

Feature	Support Plate	Hump Support
Shape	Flat or slightly curved	Arched or hump-shaped
Pressure Drop	Higher compared to hump supports	Lower
Liquid Drainage	Good	Excellent
Applications	General-purpose, wide range	High liquid flow, low pressure drop

#support plate #hump support #flat support plates

The properties of polyacrylamide conductive hydrogel

2025-02-21

Polyacrylamide conductive hydrogels are a type of smart material that combines the electrical conductivity of a conductive polymer with the unique properties of a hydrogel. These hydrogels have various applications, including bioelectronics, tissue engineering scaffolds, and sensors. Here's a general overview of the preparation and properties of polyacrylamide conductive hydrogels:

Preparation:

1. Synthesis of polyacrylamide (PAM): Polyacrylamide is often synthesized by free radical polymerization of acrylamide monomers. The reaction can be initiated using a chemical initiator or photochemical initiation.

2. Introduction of conductivity: To impart conductivity to the hydrogel, a conductive polymer, such as polypyrrole (PPy) or polyaniline (PANI), is often incorporated into the PAM matrix. This can be achieved through in-situ polymerization or by mixing pre-formed conductive polymer particles with the PAM solution.

3. Crosslinking: Crosslinkers are added to the PAM solution to form a three-dimensional network structure, giving the hydrogel its gel-like properties. Common crosslinkers include N,N'-methylenebisacrylamide (BIS) or poly(ethylene glycol) diacrylate (PEGDA). Crosslinking can be achieved by thermal, chemical, or photochemical methods.

4. Swelling and purification: The hydrogel is usually immersed in a solvent, such as water, to allow it to swell and remove any unreacted monomers or chemicals. The purification process is often repeated to ensure the removal of impurities.

Properties:

1. Electrical conductivity: The incorporation of a conductive polymer into the hydrogel matrix imparts electrical conductivity to the resulting material. This electrical conductivity allows for the transmission of electrical signals or the sensing of electrical stimuli.

2. Swelling behavior: Hydrogels have a high water content and can absorb large amounts of water or biological fluids. The swelling behavior of the polyacrylamide conductive hydrogel can be controlled by varying the crosslinking density, pH, temperature, or the addition of specific ions or molecules.

3. Mechanical properties: The mechanical properties of polyacrylamide conductive hydrogels can be tailored by adjusting the crosslinking density or incorporating reinforcing fillers or fibers. This allows for the development of hydrogels with specific elasticity, strength, and toughness suitable for various applications.

4. Biocompatibility: Polyacrylamide is generally considered biocompatible, and conductive hydrogels based on PAM have been extensively utilized in tissue engineering and biomedical applications. However, the biocompatibility of the hydrogel can be further enhanced by incorporating bioactive molecules or modifying the surface to promote cell adhesion and growth.

5. Stimuli-responsiveness: Hydrogels, including conductive ones, can exhibit stimuli-responsiveness when specific chemical or physical conditions change. For example, pH-sensitive hydrogels can undergo volume changes in response to changes in pH, while thermo-responsive hydrogels can change their properties with temperature variations.

Polyacrylamide conductive hydrogels offer a unique combination of electrical conductivity and hydrogel properties, making them versatile materials with a wide range of potential applications in various fields.

#PAM Polyacrylamide for Sand Washing #Processing Plant Water Treatment Chemical Polyacrylamide #Waste Water Treatment Chemicals Flocculant Polyacrylamide #Top Quality Industrial Grade Polyacrylamide #Textile Chemicals Treatment Flocculant Polyacrylamide

A Introduce of the application fields of polyacrylamide in China and their respective proportions

2025-02-21

Polyacrylamide (PAM) is widely used in China, and its usage ratio changes dynamically according to industry demand and technological development. The following is a detailed analysis of the main application areas and their ratios, combined with the latest industry data and development trends:

I. Main application areas and ratios

1. Oilfield exploitation (about 81%)

Application scenarios: As an oil displacement agent and drilling mud conditioner, it is used to improve crude oil recovery (tertiary oil recovery technology). Domestic Daqing, Shengli and other oil fields have significantly improved crude oil recovery by injecting PAM aqueous solution to improve the oil-water flow rate ratio.
Technical features: High molecular weight PAM can increase oil displacement capacity and reduce mining costs, especially in low permeability reservoirs.

2. Water treatment (about 9%)

Application scenarios: Mainly used for urban sewage treatment (sludge dehydration), industrial wastewater treatment (such as printing and dyeing, electroplating wastewater) and drinking water purification. As a high-efficiency flocculant, PAM can accelerate the sedimentation of suspended particles and reduce sludge volume.
Growth trend: As environmental protection policies become stricter, the demand growth rate in the water treatment field is the fastest, and it is expected that the proportion will continue to increase in the future.

3. Papermaking (about 5%)

Application scenarios: As a retention aid, filter aid and dry enhancer, it can improve paper strength, reduce fiber loss, and be used for papermaking wastewater treatment. Anionic PAM can improve filler retention and reduce production costs.
Market potential: The domestic papermaking industry has a strong demand for PAM, especially in the production of high-end paper products.

4. Mines (about 2%)

Application scenarios: used for mineral processing wastewater treatment, coal washing wastewater sedimentation and tailings concentration. PAM recovers useful mineral particles through flocculation to reduce resource waste.

5. Other fields (about 3%)

Agriculture: as a soil water retainer and fertilizer slow-release agent, it improves crop drought resistance.
Textile printing and dyeing: used for wastewater treatment and fabric finishing to reduce dye residues.
Medicine and building materials: have specific applications in drug separation, gypsum reinforcement and other fields.

II. Industry development trend

The fastest growth in water treatment and papermaking: driven by environmental protection policies and industrial upgrades, it is expected that the proportion of water treatment will exceed 10%, and the annual growth rate of demand in the papermaking field will reach 8%.

Oilfield exploitation is still the core market: Although tertiary oil recovery technology is mature, the oil industry's reliance on PAM is difficult to replace in the short term and will still dominate in the future.

Emerging application expansion: Agricultural water retaining agents, highly absorbent materials and other sub-sectors are gradually emerging and may become future growth points.

Regional and enterprise distribution

Production concentration: 53% of domestic PAM production capacity is concentrated in East China (such as Shandong and Jiangsu), and major companies include PetroChina Daqing Refining and Chemical, Beijing Hengju, etc.
Technology upgrade: New processes such as microbial catalysis improve product purity and promote the localization of high-end PAM (such as ultra-high molecular weight type).

If you need more complete industry data or specific cases, you can further refer to other sources.

#Linear Injection Anionic Cation Emulsion PAM Polyacrylamide #Flocculant Agent Anionic Polyacrylamide #High Quality Chemical Flocculant Polyacrylamide #Papermaking Cationic Polyacrylamide #Industrial Auxiliaries Polyacrylamide PAM #Cationic Anionic Nonionic Polyacrylamide

How to perform turbidity test on polyacrylamide?

2025-02-21

To perform a turbidity test on polyacrylamide, you can follow these general steps:

1. Prepare a polyacrylamide solution: Dissolve a known amount of polyacrylamide in a suitable solvent, such as water or a buffer solution, according to the desired concentration. Ensure that the polyacrylamide is completely dissolved before proceeding.

2. Set up a spectrophotometer: Calibrate the spectrophotometer at the appropriate wavelength (usually in the visible range) according to the instrument's instructions.

3. Fill cuvettes: Fill a cuvette or test tube with the prepared polyacrylamide solution. Fill another cuvette with the solvent used for dissolving the polyacrylamide (e.g., water or buffer solution) as a blank.

4. Measure the blank: Place the blank cuvette into the spectrophotometer and measure the absorbance of the blank solution using the calibrated wavelength. Note down the reading.

5. Measure the sample: Replace the blank cuvette with the cuvette containing the polyacrylamide solution. Measure the absorbance of the polyacrylamide solution using the same wavelength and note down the reading.

6. Calculate the turbidity: The turbidity of the polyacrylamide solution can be determined by comparing the absorbance of the sample to that of the blank. The higher the absorbance, the higher the turbidity. This can be calculated using the following formula:

Turbidity = Absorbance_sample - Absorbance_blank

Keep in mind that the specific details and requirements of the turbidity test may vary depending on the intended purpose and the properties of the polyacrylamide being tested. It's always a good idea to consult any relevant protocols, standards, or specific procedures provided by regulatory bodies or scientific literature in your field.

#Superfloc Chemical Additives Polyacrylamide #Polyacrylamide for Construction Waste Water #Polyacrylamide Manufacture Anionic Cationic #Cationic Polymer Hydrolyzed Polyacrylamide #Polyacrylamide Flocculant Papermaking Pulp Additives

What are the applications of polyacrylamide in cosmetics?

2025-02-21

Polyacrylamide, a synthetic polymer, has several applications in the cosmetic industry due to its unique properties. Some of the common applications of polyacrylamide in cosmetics include:

1. Thickening Agent: Polyacrylamide can act as a thickening agent in cosmetic formulations. It helps increase the viscosity of creams, lotions, and gels, providing a smooth and desirable texture to the products.

2. Stabilizer: It is used as a stabilizer in cosmetic emulsions, preventing the separation of oil and water phases. Polyacrylamide enhances the stability of emulsions such as creams, foundations, and moisturizers, ensuring a uniform distribution of ingredients.

3. Film-Forming Agent: Polyacrylamide is often utilized as a film-forming agent in cosmetics. It creates a thin film on the skin's surface, providing a protective barrier and assisting in improving the longevity of makeup, such as long-wear foundations, eyeliners, and mascaras.

4. Suspending Agent: It can be employed as a suspending agent to prevent the settling of solid particles in cosmetic formulations. Polyacrylamide helps maintain an even distribution of pigments, exfoliating particles, and other ingredients in products like scrubs, serums, and masks.

5. Texturizer: Polyacrylamide can modify the texture of cosmetic products. It imparts a silky, smooth, or gel-like texture to various formulations, enhancing the sensory experience for the users.

6. Hair Care Products: Polyacrylamide finds application in hair care products such as hair gels, mousses, and styling products. It provides hold, volume, and control to hairstyles, allowing for increased manageability and style retention.

It's important to note that the safety and efficacy of cosmetic ingredients, including polyacrylamide, are regulated by various authorities, and manufacturers must adhere to specific guidelines and standards to ensure consumer safety.

#Water Treatment Chemical Flocculant for Oil Exploration #PAM Chemical Organic Anion Cationic Hydrolyzed Polyacrylamide #Good Price Water Treatment Flocculant Anionic CPAM #Professional Polyacrylamide Manufacturer Oil Drilling Chemicals #Polyacrylamide for Sludge Dewatering Cationic PAM #100% Pure PAM Polyacrylamide Flocculants Powder

« Prev
1
...
19
20
21
...
50
Next »