Uses

• General sealing of construction and expansion joints.
• Sealing of vertical and horizontal joints.
• Sealing applications in basement walls.
• Sealing joints between precast concrete elements.
• Suitable for concrete, wood, marble, natural stone, aluminum, steel, ceramic tiles and gypsum boards.

Advantages

• One-component polyurethane sealant.
• Excellent adhesion to a wide range of substrates without priming under normal conditions.
• High elasticity and suitable for joints with significant movement.
• Movement accommodation of ±25%.
• Excellent water resistance.
• Suitable for a wide service-temperature range.
• Easy and economical to apply.
• Excellent resistance to aging.
• Paintable with commonly used construction paints, subject to compatibility testing.
• Remains elastic at temperatures down to -30°C.
• Good resistance to microorganisms and a variety of chemicals.
• Non-sag consistency for vertical and horizontal joints.

Standards Compliance

• Complies with ISO 11600, Type F, Class 25 LM.
• Complies with ASTM C920, Type S, Grade NS, Class 25, Uses NT, T1, A, M and I.

Substrate Preparation

All substrates must be clean, dry and free from dust, oil, grease and any contaminants that may reduce adhesion.

When cleaning is required, use methyl ethyl ketone (MEK), acetone or a suitable grease remover. Ensure that the substrate is completely dry before applying the sealant.

Priming

ULTRA SEAL PU 500 generally provides strong adhesion to common clean, dry and sound substrates without requiring a primer.

A suitable primer may be used on porous or non-porous substrates when optimum adhesion strength is required. A suitable primer must be used for joints that will remain continuously submerged in water.

Apply one thin coat of primer to the sides of the joint using a small brush. Avoid excessive priming and apply the sealant while the primer remains tacky.

Joint Design

• Install a polyethylene backing rod to control the sealant depth.
• For optimum performance, maintain a joint width-to-depth ratio of 2:1.
• The minimum recommended sealant depth is 5 mm.

Application

1. Apply the product at a temperature between 5°C and 50°C.
2. For cold-weather application, store the product at approximately 20°C for 24 hours before use.
3. Install a suitable polyethylene backing rod at the required depth.
4. Extrude the sealant continuously into the prepared joint, ensuring complete contact with both joint sides.
5. Avoid trapping air inside or beneath the sealant.
6. Tool and finish the sealant immediately after application.
7. Press the sealant firmly against the joint sides to achieve proper adhesion.

Consumption in Joints

The following values indicate the approximate number of linear metres obtained from one 600 ml sausage:

The stated consumption values are approximate. Actual consumption depends on the joint dimensions, application method and material wastage.

Limitations

• Do not apply to weak or unsound substrates.
• Although the sealant is generally paintable, paint compatibility should be tested before application.
• Prolonged ultraviolet exposure may reduce the surface gloss but does not affect the sealant’s functional performance.
• Use an appropriate primer for joints that will remain continuously submerged in water.

Cleaning

Remove uncured material from tools and equipment using paper towels, then clean with acetone, xylene or another suitable solvent. Hardened sealant must be removed mechanically.

Storage and Shelf Life

Store ULTRA SEAL PU 500 in its original unopened packaging in a dry place at a temperature between 5°C and 25°C.

The product has a shelf life of 8 months from the manufacturing date when stored under the recommended conditions. Storage at temperatures above 25°C may shorten its shelf life.

Packaging

• 600 ml sausages.

Health and Safety

• Use suitable protective gloves and safety goggles during application.
• Avoid unnecessary contact with the skin and eyes.
• In case of eye contact, rinse immediately with plenty of clean, cold water and obtain medical attention.
• Ensure adequate ventilation during application.
• The cured product is considered non-hazardous.
• Refer to the latest Safety Data Sheet before handling or using the product.

Quality and Technical Support

WHITE SAND products are developed and manufactured under a quality-oriented product-development process and an independently certified quality management system.

WHITE SAND provides technical assistance and guidance regarding joint preparation, product selection, application requirements and construction-chemical systems.