Description of PP Sponge Wheel: PP sponge roller is a sponge made of polypropylene (PP) material, due to it's acid and alkali resistant feature, it's usually used on PCB factory or electroplating factory for etching process. The material is cheap than PU and PVC sponge, so it's welcomed by most pcb manfacturers. PP Sponge Wheel roller feature: 1. Water absorption performance: PP water absorption sponge has good water absorption performance, can quickly absorb water and maintain its shape. 2. Water retention performance: PP absorbent sponge can effectively retain the absorbed water and prevent the rapid evaporation of water. 3. Durability: PP absorbent sponge has high durability and pressure resistance, and can withstand long-term use without deformation or damage. 4. Cleanliness: PP absorbent sponge is easy to clean and can be washed or wiped to remove adsorbed stains or dust. 5. Widely used: PP sponge roller is often used in PCB etching field, electroplating industri…