Dow -DOWSIL™ 888 Silicone Joint Sealant

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One-part, non-sag silicone material that cures to a low-modulus silicone rubber upon exposure to atmospheric moisture. Can be applied over a wide temperature range.


Category: UV resistant sealants | elastomeric sealants | special purpose sealants...

MasterFormat: Joint Protection | Joint Sealants | Glazing...



Dow
Corporate Center
PO Box 994
Midland, MI 48686
Tel: (586) 496-4000

fixspec@dow.com

https://www.dow.com/en-us.html

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Overview


DOWSIL™ 888 Silicone Joint Sealant

One-part, non-sag silicone material that cures to a low-modulus silicone rubber upon exposure to atmospheric moisture. Can be applied over a wide temperature range.
Uses

  • New construction, repair or remedial applications
Benefits
  • 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.


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Specifications

Application Benefits
Application Temperature Range-29 to 49 °C
Primerless AdhesionPrimerless
Resistance TypeFuel Resistance, Jet Fuel Resistance
Product Use and Formulating
Cure System1-Part Cure
Full Adhesion Time14 to 21 Days
Room Temperature Cure - Days7 to 14 Days
Tack-free Time (50% RH)60 minutes
Where UsedJob Site
Typical Properties
Adhesion toConcrete, Masonry
AppearanceOpaque
ChemistryNeutral
ColorGrey
Durometer - Shore A15
Modulus @ 150% Elongation, maximum28 psi
MovementMedium
Resistance TypeOzone Resistance, Thermal, UV, Water
Shelf Life360 Days
Specific Gravity @ 25°C1.48
SubstratePorous