AU-1 Hybrid is a premium-grade, one-component construction sealant formulated with silyl-terminated polyether (STPE) technology. Designed for versatility and long-term performance, AU-1 Hybrid delivers outstanding adhesion, flexibility, and weather resistance across a wide range of substrates and climates. AU-1 Hybrid can be applied in extreme weather, below freezing, and in wet environments.
This high-performance hybrid formula cures fast, applies easily—even on damp surfaces—and forms a durable, waterproof seal that stands up to the toughest jobsite conditions. Whether you’re sealing expansion joints, windows, siding, flashing, or waterproofing, AU-1 is built to move with the structure and resist cracking, UV, and weathering.
Key Features
Fast cure – water-ready and paintable in 1 hour
Excellent adhesion – sticks to Kynar®, aluminum, vinyl, concrete, and more
Flexible performance – 50% joint movement
Interior & exterior use – even in extreme weather
Cold-weather friendly – applies down to 21°F
No primer needed for most surfaces
Low-VOC & 100% solids – compliant in all 50 states
ASTM C920, Class 25 certified
Applications
Control and expansion joints
Tilt-wall and precast concrete
EIFS and stucco systems
Aluminum, vinyl, and wood siding
Window and door frames
Flashing and general building envelope sealing
Product Specifications
ASTM C920 Type S, Grade NS, Class 25
ASTM C-834 -18ºC
Meets Fed Spec TT-S-00230C
Meets Physical Requirements of AAMA 808.3, 805.2, 803.3 (Type I), 802.3 (Type II).
