Huitian 8921U is industrial modified polyurethane sealant for passenger vehicles. It cures gradually at room temperature by absorbing ambient moisture, with low-odor eco-friendly formula. It is mainly applied to waterproof sealing of coach joints and windshield gaps. The cured adhesive features high elasticity, excellent UV & rain erosion resistance without black runoff; no sagging during vertical & overhead application, and it can be polished and top-coated with paint, widely adopted by bus manufacturers for mass production.
Core Technical Parameters
– Available Colors: White, Black, Iron Grey
– Curing Mode: Single-component moisture curing at ambient temperature
– Density: 1.30 g/cm³
– Hardness: Shore A 40
– Skin-over Time: ~40 mins (23℃, 50%RH); fully cured within 7 days
– Elongation at Break: ≥500%, outstanding flexibility
– Continuous Service Temperature: -45℃ ~ 90℃
– Thixotropy: High thixotropic property, no sagging on vertical & overhead surfaces
– Packages: 310ml rigid cartridge, 600ml sausage foil pack
– Key Feature: Excellent resistance to black runoff and ultraviolet aging
Key Product Advantages
1. Premium weather & UV resistance, anti-black runoff: No yellowing or black liquid precipitation after years of outdoor exposure, keeps vehicle paint intact permanently;
2. High elasticity absorbs structural deformation: Compensates thermal expansion/contraction and driving vibration to prevent water leakage permanently;
3. Anti-sagging thixotropy: Smooth extrusion via manual/pneumatic caulking guns, clean construction on vehicle roofs and side panels;
4. Paintable & polishable: Surface can be sanded and sprayed with automotive topcoat after curing, ideal for vehicle finishing & repair;
5. Low-odor non-corrosive formula: Comfortable for enclosed workshop production, no damage to metal, paint and glass substrates;
6. Wide substrate adhesion: Bonds firmly to steel, aluminum alloy, FRP, glass and engineering plastics.
Main Applications
1. Perimeter waterproof sealing for front windshields and side windows of coaches, city buses and passenger vehicles (core application);
2. Joint sealing for bus body welds, luggage compartments, air-conditioning cabins and roof panels;
3. Waterproof caulking for rail transit carriages and truck cargo box sheet metal seams;
4. Door & window gap sealing for construction machinery and agricultural machinery cabs;
5. Weather-resistant sealing for ship cabins, containers, building curtain walls and equipment housings.）
Our experienced engineers and technical specialists are here to provide professional guidance, product selection, and application support tailored to your specific requirements.
