Selleys Blockade is a neutral cure multi-purpose solvent borne copolymer rubber based sealant offering good all round performance. It is available in grey colour and cures to a flexible rubber with good adhesion to most building materials.

Uses

Selleys Blockade is a general purpose sealant. It can be used on metals, most plastics, painted and unpainted timber, and masonry substrates. It can be used on many wet substrates. It can be used on metals even if they have an oily surface film typical on new metals; e.g. Zincalume® and galvanised iron. Some applications include sealing or repairing roofs, awnings, skylights, ceramic tiles, gutters and downpipes, around window frames, plumbing entrances, vinyl or aluminium siding and roof flashings, sealing leaks in caravans and recreation vehicles, and waterproof bedding for glass when reglazing windows.

Technical Features

• High performance copolymer rubber based for indoor and outdoor applications
• Universal sealant - adheres to most substrates
• Neutral cure - will not attack metal or concrete type substrates
• Adheres to many wet substrates, especially if pre-wiped with acetone
• Good working characteristics, easy to apply and tool
• Offers good weatherability and resistance to U.V. light
• Good slump resistance
• Good paintability - can be over painted immediately with oil based and water based paints. For best results it is recommended to first undercoat with a premium water based undercoat.
• Easy clean up with mineral turps

Appearance

A light grey soft paste

Viscosity

12,000 - 16,000 Poise @ 25ºC

Extrudability

153g/min. @ 25ºC, 36g/min. @ 5ºC, 276kPa pressure through 3mm diameter orifice (Semco cartridge)

Slump

Non slump in normal applications

Skin Time

3 mins. @ 25ºC

Tack Free Time

20 mins. @ 25ºC
90 mins. @ 5ºC

Specific Gravity

1.26kg/Lt

Solids Content

80% by weight
70% by volume

Cure

Neutral, will not attack metal or concrete substrates

Dirt Pick Up

Minimal once tack free

UV Stability

Minor yellowing on surface after 2000 hours continuous exposure in a UV cabinet. Minor yellowing on surface after 700 hours (300 hours light time) of accelerated weathering in a QUV weatherometer.

Hardness

45 (10 weeks cure @ 40ºC Shore A instantaneous)

Paintability

Water based paints, generally good but certain paints may require extra preparation

Oil/Alkyd paints, generally good though some paints may take longer to dry unless first undercoated with a water based undercoat

Modulus @ 100% Extension (ASTM D412)

176kPa (after 6 weeks cure at 40ºC)

Ultimate Tensile Strength (ASTM D412)

96kPa (after 6 weeks cure at 40ºC)

Elongation at Break (ASTM D412)

500%

Adhesion

Satisfactory adhesion is achieved on copper, Zincalume®, galvanised iron, hot rolled iron, milled aluminium, anodised aluminium, bituminous flashing, PVC, glass, marble, terrazzo, brick, concrete, hoop pine wood, pine wood, jarrah wood and solid polystyrene

Service Temperature Range

Suitable for use under normal temperatures reached on roofing materials in service

Application Temperature

In very cold or very hot weather, Selleys Blockade should be conditioned to room temperature before use for best results