DOWSIL™ 888 Silicone Joint Sealant

Effective for sealing transverse contraction and expansion joints, longitudinal, center line and shoulder joints in Portland Cement Concrete (PCC).

Uses:

Can be extruded from -20 to 120°F.
May be used in joints that are not uniform in width.
Movement capability 100% extension and 50% compression.
Low modulus.
Weather and UV resistant.
Fuel resistant-short term exposure. Refer to Dow form number 62-207 for more information.
One component, cold applied, ready-to-use as supplied; dispensed directly from the bulk container into the joint by hand or with an air-powered pump.
Unprimed adhesion – primer is not required for bonding to Portland cement concrete. For optimum adhesion, the surface must be clean, dry and frost-free.
Cure time – typically, the sealant will have a skin-over time of one hour or less at standard conditions.

These values are typical properties and are not intended for use in preparing specifications.

Adhesion to Yes No Concrete, Masonry
Appearance Yes No Opaque
Application Temperature Range Yes No -29 to 49 °C
Chemistry Yes No Neutral
Color Yes No Grey
Cure System Yes No 1-Part Cure
Durometer - Shore A Yes No 15 Shore A
Elongation Yes No > 1000 %
Flow Yes No NonSag
Full Adhesion Time Yes No 14 to 21 Days
Modulus @ 150% Elongation, maximum Yes No 28 psi
Movement Yes No Medium
Number of Parts Yes No One
Primerless Adhesion Yes No Primerless
Resistance Type Yes No Fuel Resistance, Jet Fuel Resistance, Ozone Resistance, Thermal Resistance, UV Resistance, Water Resistance
Room Temperature Cure - Days Yes No 7 to 14 Days
Shelf Life Yes No 360 Days
Specific Gravity @ 25°C Yes No 1.48
Substrate Yes No Porous
Tack-Free Time-50% RH Yes No 60 Minutes
Water Resistant Yes No true
Where Used Yes No Job Site

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