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“Moisture Resistant Plywood: MR vs WBP and the Full Moisture-Grade Ladder (IS 303, EN 636, AS/NZS 2271 Mapped)” is nog niet beschikbaar in Nederlands

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Quick Answers

What is moisture resistant (MR) plywood?
Moisture resistant plywood, or MR plywood, is plywood bonded with urea-formaldehyde (UF) glue that tolerates indoor humidity but is not waterproof. Under IS 303 it is the lowest moisture bond class and fails the 2-hour boil test that BWR, BWP, and WBP grades pass. It is correct for dry interior furniture and wrong for anything that meets standing water.
Is moisture resistant plywood waterproof?
No. MR plywood resists ambient indoor humidity, but the urea-formaldehyde glue is water-soluble, so a single saturation cycle — a sink leak, a bathroom overflow, or coastal monsoon damp — hydrolyses the bond and the panel delaminates. For water contact, step up to BWR (intermittent) or BWP/marine (sustained).
MR plywood vs WBP plywood: what is the difference?
MR (urea-formaldehyde) is the bottom rung, for indoor use only. WBP (Weather and Boil Proof) covers the top rungs: WBP melamine (MUF, EN 636 Class 2, formwork reuse up to 10–15) and WBP phenolic (PF, Class 3, up to 20). Both WBP types pass the boil test; MR fails it. The adhesive chemistry, not the face, sets the grade.
How should I read moisture resistant plywood price?
Price searches usually mean "how cheap can I go," but the real cost lever is the grade, not the per-sheet rate. Specifying MR for a wet zone to save money costs more once the unit swells and is rebuilt. Choose the rung that survives the job — MR for dry interiors, BWR or above once water is involved — then ask suppliers to price that grade.