An open-pore, flexible polyurethane foam on a polyether/polyester base.
Grades/types PPI (pores per inch) indicates the number of cells in the foam per inch.
The standard range is 10-80 PPI. PPI 10 has large cells and is completely open, while PPI 80 has small cells, is more dense, and has a lower air flow.
PPI filtration foam is also available on a polyester - or polyether basis.
PPI filtration foam on a polyester base should not be used in proximity to water or other humid surroundings, as there is otherwise a risk of decomposition However, PPI filtration foam on a polyether base is suitable for applications in humid environments or water filtering.
Applications For filtering dust, water vapor, drifting snow etc., or as a filter and lining in loudspeakers. Has limited durability in direct sunlight.
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