MASTERSTOP LONG TIME Swelling Waterstop 25 × 20 mm – 5 m

MASTERSTOP LONG TIME is a sodium bentonite-based swelling waterstop designed for sealing construction joints in concrete structures. The product is manufactured from sodium bentonite with rubber content and is intended for weather-independent installation in waterproof concrete applications.

The swelling tape expands upon contact with water, creating pressure against surrounding concrete surfaces to help seal construction joints and prevent water penetration. Depending on the surrounding liquid environment, the swelling volume can reach up to 340% in normal water.

The product is suitable for areas with frequently changing water levels and offers resistance to various aggressive substances, including alkalis, slurry, biogas, wastewater, de-icing salts, fermentation by-products, and radon.

MASTERSTOP LONG TIME is certified with CE marking, ETA approval, and General Building Supervisor Board Certificate (abP).

Key Features:

• Sodium bentonite swelling waterstop
• Weather-independent installation
• Expands up to 340% in water
• Suitable for varying water levels
• Water pressure resistance up to 5 bar
• Resistant to alkalis, wastewater, slurry, biogas, and de-icing salts
• Flexible and malleable consistency
• Smooth surface
• CE marked and ETA approved

Technical Specifications:

• Dimensions: 25 × 20 mm
• Length: 5 m
• Material: Sodium bentonite with rubber content
• Colour: Black
• Density: 1.53 g/cm³
• Expansion in normal water (pH 7): up to 340%
• Expansion in aggressive liquids: up to 150%
• Expansion in alkaline liquids: up to 290%
• Water pressure tightness: up to 5 bar
• Thermal application range: -30 °C to +90 °C
• Protective film dissolution: approx. 6–7 days after concrete placement

Certifications & Approvals:

• CE marked
• ETA-16/0735
• abP test certificate (MFPA Leipzig)
• Suitable for utility class A according to WU guideline

Application & Usage:

MASTERSTOP LONG TIME is used for waterproof sealing of construction joints in concrete structures where protection against water penetration is required.

Suitable for:

• Construction joints
• Underground concrete structures
• Water treatment plants
• Foundations and basements
• Infrastructure and industrial construction
• Waterproof concrete systems

Usage Instructions:

Install the swelling tape onto a clean and stable substrate before concrete pouring. Ensure proper positioning within the construction joint. Protect the product from premature water exposure before concrete placement.

Storage Instructions:

Store in a cool and well-ventilated room with recommended humidity of at least 65%. Protect from frost, direct sunlight, and heat sources.