CrackFix PU 35 Sealant

Product Overview

CrackFix PU 35 is a high-strength, fast-cure polyurethane sealant designed for high-requirement bonding and sealing applications. It offers excellent wear and weather resistance and maintains performance across a wide range of temperatures from -40°C to 80°C.

Technical Data

Test conditions: Temperature 25±2°C, Humidity 50±5% RH

Before Cure

Property	Test Standard	Value
Appearance	Vision	White / Grey / Black paste
Density	GB/T13477.2	1.55 ± 0.05 g/cm³
Tack Free Time	GB/T13477.5	25–35 minutes
Cure Speed	—	3.0 mm/24h
Application Temperature	—	5–35°C

After Cure

Property	Test Standard	Value
Tensile Strength	GB/T528-1998	≈ 2.0 MPa
Elongation at Break	GB/T528-1998	≥ 300%
Hardness (Shore A)	GB/T531-1999	55 ± 5
Working Temperature	—	-40°C to 80°C

Application / Uses

Applied to bonding and sealing with high requirements on sealant elasticity and strength for industries like:

• Building decoration — Joints, facades, and structural sealing
• Machinery — Industrial equipment bonding and sealing
• Furniture — High-strength adhesive bonding
• Marine — Weather-resistant sealing in maritime environments
• Containers — Durable sealing for shipping containers
• Rail transportation — Vibration-tolerant bonding for rail vehicles
• Automotive — Flexible sealing for vehicle assemblies

How to Use

1. Surface preparation — Clean the surface of substrates, keep it dry, free of dust and grease.

2. Open and prepare — Open the cap and the cover of the bottom (for sausage: cut one end). Put on the nozzle and cut to the appropriate size according to the width of the joint.

3. Apply — Apply the glue to the clean surface, and assemble it within the tack free time.

4. Optimal conditions — Construction is preferably at a temperature of 20–30°C and humidity of 50–70% RH. If the temperature and humidity are too low, curing will be slow. If temperature and humidity are too high, bubbles may appear in the cured layer.

Important: During the application and curing process, the polyurethane adhesive should avoid contact with chemicals containing hydroxyl, amino, etc., which may affect the adhesive performance.

Storage

• Shelf Life: 12 months for aluminum cartridge, 9 months for sausage packing
• Storage: Unopened packaging in a cool and dry place at +5°C to +25°C
• Use opened glue as soon as possible. If stored for a short time, seal properly.
• If a small crust forms at the opening, it can be removed without affecting use.

Precautions

• No adhesion on PE, PP, PTFE (Teflon) and bituminous substrates. A preliminary compatibility test is recommended.
• When painted with oxidative drying paints, disturbances in the drying may occur. Compatibility test recommended before application.
• Keep out of reach of children and away from direct light and heat.
• Wear protective eyewear during use and avoid contact with eyes and skin.
• Recommended for use in well-ventilated areas.
• If accidentally in contact with eyes and skin, wipe with cloth and then clean with plenty of clean water. If serious, seek medical advice.