X’traseal MS-608 MS Polymer Adhesive

For laying parquet flooring over subfloors where a permanent balance of high bond strength and acoustic dampening is required, X’traseal MS-608 MS Polymer Adhesive provides a flexible, moisture-resistant bond. Formulated on hybrid silyl modified polyether technology, this odourless adhesive accommodates the natural movement of timber while protecting the installation from subfloor moisture.

How it works

X’traseal MS-608 cures via atmospheric humidity to form a tough, elastic seal with a Shore A hardness of 40. The silyl modified polymer chemistry allows the adhesive to be applied directly to damp surfaces without bubbling or losing adhesion, making it highly reliable in variable site conditions. Because it is free from solvents, isocyanates, acids, and silicone oils, it does not pose the shrinkage or staining risks associated with traditional polyurethane or solvent-based adhesives. It also provides built-in sound dampening properties to reduce footfall noise through the floor assembly.

Numbers that matter

• 800% elongation at break: High elasticity (tested to ASTM D412) that allows the cured adhesive to absorb significant timber expansion and contraction without joint failure.
• 0.90 mPa lap shear strength: High wood-to-wood bond strength (tested to ASTM C961) to keep solid and engineered timber planks flat and securely locked to the subfloor.
• 30-minute skin time: Provides a reliable 20 to 30-minute open working window under standard conditions to trowel adhesive and set boards before skinning begins.
• -40°C to 100°C service temperature: A wide thermal operating range that ensures the bond line remains stable under direct solar heating or in unconditioned spaces.

Where to use it

Suitable for bonding many types of parquet, solid wood, and engineered timber flooring to almost any common subfloor in both internal and external applications. Specific coverage rates and trowel configurations include:

• Finger Block Parquet: Use a 3 mm x 3 mm x 3 mm square notch trowel for coverage up to 2.0 m²/L.
• ≤13 mm Solid or Engineered Wood: Use a 4 mm x 3 mm V-notch trowel (up to 1.4 m²/L) or a 5 mm x 4 mm V-notch trowel (up to 1.2 m²/L).
• 9–13 mm Solid Wood, >13 mm Engineered Wood, or <19 mm Parquet: Use a 6 mm x 6 mm x 3 mm square notch trowel for coverage up to 1.0 m²/L.
• >13 mm Solid Wood and 4’ x 4’ Plywood: Use a 6 mm x 6 mm x 6 mm square notch trowel for coverage up to 0.9 m²/L.

Limitations

• Do not use on PE, PP, PTFE, bituminous substrates, or plastics containing softeners.
• Not suitable for structural glazing or underwater applications.
• Do not use in totally confined spaces; atmospheric humidity is required for the adhesive to cure.
• Not suitable for heavy trafficable joints, exposure to aggressive solvents/chemicals, or direct food contact.
• While paintable with water-based systems, alkyd resin paints may experience extended drying times. Cracking may occur if the paint film cannot match the high movement capability of the adhesive.
• White variants may show surface yellowing if exposed to strong UV light for prolonged periods.

Installation and prep

Substrates must be clean, dry, and completely free from dirt, oil, grease, detergents, and loose material. Only trowel out as much adhesive as can be worked within 20 to 30 minutes. Slide the timber planks into the wet adhesive bed and tap firmly into place to secure a full bond. Uncured excess adhesive can be cleaned up using mineral spirits or cleaning solvents; cured adhesive must be removed mechanically.