... the flange is made of solid wood.3) Thickness of web: 30mm( special thickness available on clients' requent), the ... web is made of multilayer plywood.4) Length: 1.8m, 2m, ... (professional glue)D) Painting on the surface of flange and web:with yellow, waterproof, fireproof, rot-proof and frozen-proofpainting, and the ...