Belzona 3121 (MR7)

Belzona 3121 (MR7) A 2-part polymer composite designed to provide emergency roof repair and weatherproofing for leaking roof areas. Belzona 3121 (MR7) is liquid-applied and bonds strongly to all common roofing surfaces including slate roofs, tile …

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Stock Status: 500 pcs

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Belzona 3121 (MR7)

A 2-part polymer composite designed to provide emergency roof repair and weatherproofing for leaking roof areas. Belzona 3121 (MR7) is liquid-applied and bonds strongly to all common roofing surfaces including slate roofs, tile roofs, asphalt, felt, asbestos cement sheet roofs and metal roofs, even during adverse weather conditions.

This fast-curing, all climate flexible repair system incorporates a reinforcement sheet which ensures the coating will adapt to roof movements and follows complex roofing contours. This system is water resistant immediately after application and can cure even if fully immersed in water.

Key benefits:

Can be applied and will cure even during adverse weather conditions

Simple application method with no primers or conditioners required

Application and cure as low as 0°C (32°F)

No hot work involved

Microporous structure allows trapped moisture to escape whilst providing long-term weatherproofing protection

Excellent adhesion to a wide range of materials including felt, asphalt, lead, zinc, copper, glass, concrete and brick

Adapts to roof movements with its outstanding elasticity

Can be easily applied by brush

Applications for Belzona 3121 (MR7) include:

Emergency repair of roof lights, gutters, splits in roofing felt, leaking joints and other roof areas

Sealing of joints and seams to provide weatherproofing and waterproofing

Key technical data:

Working life at 20°C (68°F) 2 hours

Cure time The system is water resistant immediately and can cure even if fully immersed in water

Tensile strength (ASTM D412 (Die C)) 800 psi (5.51 MPa) reinforced, 1,140 psi (7.86 MPa) unreinforced

Water vapour permeability (ASTM D1653) 17g/m²/24

Recommended coverage rate (per ltr) Practical coverage rate for a 2 coat system:

1st coat 1.9 sq.m. (20 sq.ft.) per litre on asphalt, smooth felt, bitumen and metals

2nd coat 2.0 sq.m. (21 sq.ft.) per litre on asphalt, smooth felt, bitumen and metals

Bonds to Felt, asphalt, lead, zinc, cooper, glass, concrete, brick and many more

Typical applications Emergency roof repair including leak sealing, waterproofing and weatherproofing

Unit size 0.75 litres, 3 litres. Pack sizes may vary locally

Availability* Global

* All products are subject to regional restrictions. Check with your local Distributor for more information

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