Surface Preparation

• Ensure all bonding surfaces are clean, dry, and free from dust, grease, rust, or loose particles to guarantee maximum adhesion.
• For non-porous substrates (metal, glass), use a compatible solvent and a clean cloth for degreasing.
• Cut the nozzle tip at a 45-degree angle to the desired bead size suitable for the fire-stop joint.
• Verify that the ambient temperature is within the recommended range (5°C to 40°C) before application.

Application Instructions

• Apply Fire Rated Silicone WD-336 as a continuous bead, ensuring complete contact with both sides of the joint or penetration.
• For deep joints, use a fire-resistant backing material (such as rock wool) to control sealant depth and ensure the 4-hour fire rating.
• Tool the sealant immediately after application (within 10-15 minutes) to ensure a smooth finish and a smoke-tight seal.
• Ensure the Fire Rated Silicone completely fills the gap without leaving air pockets or voids that could compromise fire containment.

Curing & Limitations

• Allow the sealant to skin over (typically 10-20 minutes) and achieve initial cure before any mechanical stress is applied.
• Full performance for 280°C continuous exposure and waterproof integrity is achieved after a complete 7-day cure period.
• Do not apply this Fire Rated Silicone to surfaces that are wet, frosted, or contaminated with oils and plasticizers.
• This product requires atmospheric moisture to cure; avoid use in totally confined spaces where air cannot circulate.