What is a PVA Sponge?

Physical Properties of the PVA sponge.


 A PVA sponge is essentially composed of Polyvinyl Alcohol and is a synthetic sponge. It has a three-dimensional open cell structure that is similar to the natural sea sponge. All of the cells in it are interconnected and are not independent. The major advantages of its physical structure are its ability to be refused after cleaning, its high filtering efficiency, and its impressive retention and the wicking properties.

The PVA sponge can absorb up to 12 times its dry weight water. When it is saturated with water, it becomes so soft like the natural sea sponge and flexible. The wet volume is 20% greater than the dry volume. The PVA sponge reveals mechanical strength and abrasion resistance equal to any other synthetic sponge. The size and the shape of the pores can vary to meet the specific applications. The wet sponge can stand temperatures up to 90 degrees C without deforming the plastic.

 The PVA in the raw form is pure white. It is pigmented to any other color.

 Chemical Properties of the PVA sponge.

 While the production of the PVA sponge by the PVA sponge suppliers a water-soluble porous structure is chemically insoluble. The material can stand the action of dilute acid, strong alkalies and solutions of common detergents. The detergents that include “sulfate” over 5% will weaken the sponge and swell slowly. The organic solvents do not affect the sponge, until and unless they are water-miscible and are mixed with 35%- 65% water. Thorough washing the sponge in the water will return it in the original form. The PVA sponge is also incompatible with Nickel Sulfate solutions.

 The PVA sponge would behave in the water as a negatively charged colloid and will absorb metallic cations such as iron or copper strongly. It acts as an exchange resin in this. It even has a strong affinity for the cationically charged ions of the quaternary ammonium type.

 If the PVA sponge is untreated it won’t support the growth of bacteria nor the molds, nor would destroy those organisms. The foam that is packaged wet might treat chemicals to inhibit bacteria or mold growth.

 Rust stains can be removed in the same way; as they are made from cotton using a solution of oxalic acid, or tartaric acid, or citric acid. The solution of Sodium hypochlorite solution would degrade the sponge

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