P 2090 (OTTO) Poly(p-phenylene oxide) Cas 25134-01-4 - used for structural parts, electronics, household and automotive items that depend on high heat resistance, dimensional stability and accuracy. P 2090 (OTTO) Poly(p-phenylene oxide) Cas 25134-01-4 - used in medicine for sterilizable instruments made of plastic. The PPE blends are characterized by hot water resistance with low water absorption, high impact strength, halogen-free fire protection and low density.