Two-Component PU Waterproof Coating — Type I · 1:1 Mix · ≥92% Solid · −35°C Rated · B₂-E

Product Overview

Two-Component Polyurethane Waterproof Coating (Type I) is a chemical-reaction curing, high-performance liquid waterproofing system. Component A is an isocyanate-terminated prepolymer derived from polyether and isocyanate polyaddition. Component B is a colored liquid composed of plasticizers, curing agents, accelerators, thixotropic agents, and fillers.

Components A and B are mixed at a simple 1:1 bucket ratio and brush-applied onto the substrate. After crosslinking and curing at ambient temperature, a continuous, seamless, rubber-like elastic waterproof film forms — delivering ≥2.0 MPa tensile strength, ≥500% elongation, and reliable performance from −35°C to 80°C.

Unlike single-component systems, the two-component chemistry ensures full through-cure even in thick films, making it ideal for high-build applications and demanding waterproofing projects. Zero coal tar, cold-applied, no open flame — a safer, greener alternative to traditional bituminous membranes.

Quick Facts

Product Name: Two-Component Polyurethane Waterproof Coating (Type I)
Also Known As: 2K PU / Dual-Component PU / Two-Part PU / Reactive PU
Brand: Ahonesty
Origin: China
Component A: Isocyanate-terminated prepolymer
Component B: Colored curing agent with fillers
Mix Ratio: 1 : 1 (by bucket, no weighing required)
Cure Type: Ambient chemical reaction curing
Solid Content: ≥ 92% (mixed)
Film Type: Continuous, seamless, rubber-like elastic

Key Features

1. Chemical Curing — Through-Cure Guaranteed
Two-component chemistry ensures complete crosslinking throughout the film thickness, eliminating the risk of surface skin-over with uncured interior — a known limitation of single-component moisture-cure systems in high-build applications.
2. 1:1 Simple Mix Ratio
No weighing, no dosing equipment needed. Pour Component A and Component B bucket-to-bucket, mix, and apply. Designed for jobsite simplicity — reduces application errors and labor cost.
3. High Solids, High Build
≥92% mixed solid content means less solvent shrinkage, fewer coats, and lower material waste. One pass achieves the film thickness that single-component systems require two coats for.
4. Rubber-Like Elasticity
≥2.0 MPa tensile strength + ≥500% elongation at break. The cured film bridges substrate cracks up to 2 mm, accommodating structural movement without rupturing.
5. −35°C Low-Temperature Flexibility
No cracks at −35°C (fresh) and −30°C after all aging tests (heat, alkali, acid, 1000 h artificial weathering). Proven in severe cold regions.
6. Waterproof & Impermeable
0.3 MPa, 120 min water pressure — no leakage. ≤5.0% water absorption. Class B₂-E fire-rated (15 s ignition, Fs ≤ 150 mm, no burning drips).
7. Multi-Substrate Adhesion
≥1.0 MPa bond strength to concrete, wood, glass, and metal. No primer required on most substrates. Compatible with cementitious screeds and tile adhesives.

Technical Specifications

Typical Applications

1. Non-exposed roofs — concrete, metal, and built-up roof decks
2. Underground works — basements, foundations, retaining walls, tunnels
3. Wet areas — bathrooms, kitchens, laundry rooms, shower stalls
4. Balconies & terraces — under screed or tile finishes
5. Swimming pools & water features — potable-water-safe formula available
6. Complex structures — parapets, pipe penetrations, expansion joints, skylight curbs

Frequently Asked Questions

Q: Is this product flammable or hazardous?
A: No. The product is water-free but solvent-free, coal-tar-free, and Class B₂-E fire-rated. It is classified as non-dangerous goods for sea and road transport.
Q: How long is the shelf life?
A: 12 months from date of manufacture when stored in original, unopened packaging at 5–35°C, away from direct sunlight and moisture.
Q: Do you offer OEM / private-label packaging?
A: Yes. Minimum 5 tonnes for custom labeling, branding, and packaging. We supply in 20 kg (10+10) kits, 200 kg drums, and IBC totes.
Q: Can I apply this under tiles?
A: Yes. The coating bonds well to cementitious screeds and tile adhesives. Allow full cure (24–48 h depending on conditions) before tiling.
Q: What tools and surface prep are needed?
A: Substrate must be clean, dry, and sound. Apply with roller, brush, or airless spray. No primer needed on concrete. No special equipment — just a mixing paddle.
Q: What payment terms do you accept?
A: T/T (30% advance, 70% before shipment or against B/L copy), L/C at sight, and O/A for established accounts. PayPal and Western Union for samples.