CrackFix PU 35 Sealant

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.

Key Features

High-strength polyurethane sealant
Fast-cure formula — tack free in 25-35 minutes
Excellent wear and weather resistance
Elongation at break ≥ 300%
Wide working temperature range: -40°C to 80°C
Available in white, grey, and black
Suitable for high-elasticity and high-strength bonding and sealing

Technical Specifications

Appearance	White / Grey / Black paste
Density	1.55 ± 0.05 g/cm³
Tack Free Time	25–35 minutes
Cure Speed	3.0 mm/24h
Application Temperature	5–35°C
Tensile Strength	≈ 2.0 MPa
Elongation at Break	≥ 300%
Hardness (Shore A)	55 ± 5
Working Temperature	-40°C to 80°C
Shelf Life (Aluminum Cartridge)	12 months
Shelf Life (Sausage Packing)	9 months
Storage Temperature	+5°C to +25°C

Chat on WhatsApp Technical Data Sheet

Product Overview

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

Surface preparation — Clean the surface of substrates, keep it dry, free of dust and grease.
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.
Apply — Apply the glue to the clean surface, and assemble it within the tack free time.
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.