aquarium pu foam filter sponge open cell sponge air filter foam sheet fish and aquatic organisms fish tank

PU foam description:

Polyurethane foam is one of the four basic types of products that can be made from raw, liquid polyurethane. They are comprised of two chemicals which, when mixed and heated, form liquid polyurethane prior to being further processed. These chemicals are polyol, a type of complex alcohol, and diisocyanate, a petroleum byproduct that reacts strongly with alcohol. By combining the two, a stable long-chain molecule is formed. It's a polymer, or plastic, known as urethane.

PU foam features:
Good drainage, open holes
Compressibility
Cushioning
Energy absorption
Fabricatibility
Flexibility
Insulating
Light-weight
Low thermal conductivity
Low water vapor transmission
Resiliency
Sound absorption
Vibration dampening
Recyclable 
Coarse
Reticulated
Eco friendly
Non-toxic
Quick drying

PU foam applications:
filter accessories filter layer and filter cleaner
air conditioner
industrial fan fliter
aquarium filter
compressor machine
reticulated ceramics
nickel alloy net
home furniture
bedding
sofa
mattress
office building and construction
transportation and automotive 
custom products
fitness sports and exercise
health care
apparel
agriculture 
medical
passenger and rail vehicles
clothing
swimming pool
composite wood
electronics
flooring
marine
packaging