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Yes. Closed-cell PVC foam has extremely low water absorption.

A more flexible, impact-resistant PVC foam for curved or[…]

A chemically crosslinked structure providing higher strength and rigidity[…]

Typically 60–250 kg/m³ depending on structural load requirements.

Indirectly, by maintaining aerodynamic shape and stiffness.

A vertical structural beam inside the blade that increases[…]

No, since they are enclosed within composite laminates.

Combining different foams or foam + balsa to optimize[…]

Yes, particularly PET and SAN foams due to their[…]