Donseal
PU440

ONE COMPONENT POLYURETHANE SEALANT

Description:

Donseal PU440 is a one component non sag polyurethane sealant that cures by reacting with air humidity to form a tough and highly elastic low modulus sealant. Donseal PU440 has a very wide service temperature range.

Usage

Donseal PU440 is suitable for vertical and horizontal joints in the following applications:

General sealing of construction and expansion joints.
Flooring joints.
Basement walls.
Precast concrete elements.
For concrete, wood, marble, aluminum, steel, ceramic, gypsum boards, etc.

Materials Supplied

600 ml sausages and 300 ml cartridges are available on request.

Storage

Store in original unopened packages at a temperature between 5^oC and 25oC in a dry place.

Shelf Life

12 months if stored under good condition.

Application Instructions

SURFACE PREPARATION

All substrates should be clean, dry, free from dust, oil, grease and any contaminations that could effect the bonding.

If the substrates need to be cleaned, use methyl ethyl ketone (MEK), acetone or grease remover. Always be sure that the substrates are dry before the application.

PRIMING

Donseal PU440 generally has strong adhesion to common clean, dry and sound substrates without primers. However, Donseal Prime PU can be used on porous substrates in order to achieve optimum bond strength.

For joints of porous substrates which will be continuously submerged in water, it is recommended to use Donseal Prime PU.

APPLICATION

The recommended application temperature range is 5oC to 35^oC. For cold weather application, store the product in a heated area at 20^oC for 24 hours prior to use. Install polyethylene joint backing rod to control the sealant depth.

Tooling and finishing should be carried out immediately after the application of the sealant. For optimum performance, the ratio of width to depth of the sealant should be 2:1. Minimum sealant depth should however be 5 mm.

CLEANING

All tools should be cleaned immediately after finishing with paper towels and then wipe by using Acetone, xylene or other suitable solvents.

PRECAUTIONS

Not recommended for unsound substrates. Although Donseal PU440 is generally paintable, it is recommended test for the specific paint compatibility.

Long exposure to UV, will reduce surface gloss, but will not affect sealant performance.

HEALTH AND SAFETY

If Donseal PU440 comes into contact the eyes, flush with copious volumes of cold water and obtain medical attention.

Product is non-hazardous once cured.

Donseal PU440 is nonflammable

GENERAL GUIDANCE

This data sheet is for general guidance purposes only and may contain information that is inappropriate for certain conditions of use. Accordingly, all recommendations and suggestions are made without guarantee. Further information is available from our Technical Department.