Betomastic

BETOMASTIC is a single-component, cold-applied solvent-based bitumen rubber mastic joint sealant. Formulated with non-asbestos fibers, it is thixotropic and slump-free on vertical joints.

Product Overview

Betomastic belongs to the Sealants & Joint Treatment family. It is intended for membrane terminations, roof flashings, below-grade details and utility joints. Final product selection must account for substrate condition, exposure, application method and compatibility with adjoining layers. BETOMASTIC is a single-component, cold-applied solvent-based bitumen rubber mastic joint sealant. Formulated with non-asbestos fibers, it is thixotropic and slump-free on vertical joints.

Best-fit Applications

• Membrane terminations
• Roof flashings
• Below-grade details
• Utility joints

Technical Benefits

• Simple cold application
• Compatible with selected bituminous systems
• Useful for local waterproofing details

Technical & Performance Specifications

Physical Property	Declared Performance Value	Test Standard
Appearance	Black semi-stiff paste	Visual
Density	1.1 ± 0.06 g/cc	ASTM D1475
Solid Content	> 80%	ASTM D2939
Slump	Nil	ASTM D2939
Application Temperature	0°C to 40°C	ASTM E154
Service Temperature	0°C to 80°C	-
Initial Set Time	24 to 48 hours	-
Full Cure Time (10mm joint)	14 to 21 days	-

Technical Datasheet Locked

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Application Guidelines & Installation Method

Step 1: For sealants, clean and dry the joint; apply primer where required; install the specified backer rod to the correct depth; apply continuously without air gaps; tool to a smooth finish; then allow adequate curing and protect from water, traffic and damage.

Step 2: Install filler boards accurately at movement joints and prevent displacement during concrete works.

Step 3: Install backing rods continuously at the specified depth, without gaps or stretching, using the correct size to prevent three-sided adhesion.

Standard Compliance

Conforms to ASTM, BS EN, and local municipality green building regulations. Verified through independent laboratory testing and certified project listings.