On the PVA Characteristics and Physical Properties of the PCB Industry

PVA sponge is designed to handle hydrophilic porous materials—such as those undergoing wringing and moisture transfer—in various manufacturing processes. This sponge is formed through a chemical reaction involving PVA (polyvinyl alcohol) and boasts excellent water absorption and retention capabilities, as well as a soft texture and high elasticity. Moreover, to meet the demands of the electronics and semiconductor industries, our company also produces sponges with enhanced cleaning performance and high-precision characteristics.
Feature A: 1. Possesses excellent hydrophilicity and water-retention properties.
2. It has a soft, elastic texture when absorbing water and does not leave any imperfections in the work. Moreover, it adheres closely to the surface of the workpiece, even on uneven areas, and does not leave any water-absorption stains.
3. Possesses strong wear resistance, abrasion resistance, and chemical resistance.
4. Continuous porous structure, resistant to small particles and featuring excellent filtration performance.
5. There is no substrate delamination phenomenon, just like with conventional materials.
6. Due to its low extractive content and superior chemical properties, this cleaning material has virtually no impact on the object being cleaned.
B Use:
Absorption of water after cleaning flat glass, automotive glass, and glass products.
Absorption of water during the manufacturing of food processing, packaging, and steam-cooked packaged foods.
Water absorption of tires and mats
Water absorption after cleaning of films, plastics, and metal sheets
Humidification and coating of various water-soluble adhesives, coatings, antistatic agents, and more.
After cleaning, the printed circuit boards, lead frames, photomasks, and substrates for liquid crystal display screens absorb water.
Filter material
Basic physical properties of C:
Project Physical property
Void probability (probability of voids) 90%
Tensile strength 420 kPa
Average stomatal intensity (stretching rate) 150 µm
Water retention rate: 1100%
Heat-resistant temperature: 60
Solvent and pharmaceutical resistance
Hydrochloric acid less than 5%
Phosphoric acid less than 5%
Acetic acid less than 1%
Nitric acid less than 1%
Sodium hydroxide less than 5%
Hydrofluoric acid, less than 5%
Oxalic acid less than 5%
Ethyl acetate
Ether
Butanone
Pure benzene
Toluene
Xylene Xylene
Tetrahydrofuran
n-Octane
Carbon tetrachloride
Anionic synthetic detergent
Mineral oil
Animal and vegetable oils
All of the above are applicable.
Not to be used is phenol.
To be discussed:
Isopropyl alcohol L-isopropanol
Methanol
Ethanol
Acetone
Trichloroethylene
Anionic synthetic detergent / Non-ionic synthetic detergent
PVA absorbent sponges are used very frequently in PCB equipment, especially in the chemical solution section, where PVA-based absorbent rollers are required.