What uses for the Würth PU 40+ building mastic adhesive?

Würth PU 40+ Mastic adhesive is a single-component polyurethane mastic, usable for both bonding and sealing. Thanks to its high-performance formula, it is suitable for expansion joints, facade connections, metal construction elements, as well as for bonding various materials such as concrete, metal, wood, and certain plastics.

This product is particularly appreciated in interior and exterior fitting work for its ability to resist weather and vibrations.

Advantages of Würth white PU 40+ mastic adhesive

Superior adhesion: Ensures robust bonding on various materials such as wood, aluminium, metal, terracotta, certain plastics...

Reinforced waterproofing: Effectively protects against water, moisture and weather. Ideal for joints exposed to external factors.

High elasticity: Absorbing movements and vibrations, which is essential for automotive applications.

Versatile application: Suitable for a wide range of uses, from construction to bodywork repair.

How to apply Würth mastic adhesive?

1st step: Ensure that the surface on which you wish to apply the mastic is clean, dry, free of dust, grease and any substance that could affect adhesion.

2nd step: Using a suitable gun, apply the PU 40+ building mastic adhesive in a bead or dots neatly on the surface. Warning, it must be used within 24 hours of opening the cartridge.

3rd step: If you have used the PU 40+ mastic adhesive as a sealing joint, remember to smooth it (with your finger or using a soft silicone spatula) a few minutes after application for an ideal finish.

4th step: Clean fresh residues with a dry cloth.

Technical specifications

• Base: Polyurethane
• Appearance: Paste-like
• Capacity: 300ml cartridge
• Colour: White
• Application temperature: +5°C to +35°C
• Skin formation time (temperature 23°C, relative humidity 50%): approximately 50 minutes
• Temperature resistance: -40°C to +90°C
• Storage temperature: +5°C to +25°C
• Good resistance to tearing and weather.
• Good resistance to ageing, water and salt spray.
• Good UV resistance.
• This mastic can be sanded after complete drying.