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White 9.8 oz silicone sealant tube with aluminum label

D.A.P.

D.A.P. 08643 100% Silicone Sealant Aluminum 9.8 oz

SKU CH-PPFG-5AMES

100% silicone sealant resists cracking and mildew for indoor or outdoor window and door joints, meeting ASTM C920 Class 25 in a 9.8 oz cartridge

  • Product typeAxes & Wedges
  • Resists cracking, crumbling and chalking for durable seals
  • Cured sealant resists mildew growth in damp areas
  • Suitable for indoor and outdoor applications
  • Meets ASTM C920, C719 Class 25 standards
  • 100% silicone rubber ensures flexible, waterproof adhesion

Aluminum Sealant for Windows and Doors

DAP 08643 is a 100% silicone rubber sealant designed for indoor and outdoor use around windows and doors. It provides a flexible, waterproof bond that adheres to aluminum, glass, wood and other common building materials. The product is supplied in a 9.8 oz cartridge for use with a standard caulking gun.

Upgrade from Acrylic or Latex Caulks

This silicone formula replaces traditional acrylic or latex caulks that can harden, crack or shrink over time. The jump is worth it when a joint must endure repeated movement, direct weather exposure or constant moisture without failing. It resists cracking, crumbling and chalking for a longer service life.

Limits of a Class 25 Silicone

The sealant meets ASTM C920 Specification C719 Class 25, meaning it handles joint movement up to 25 percent of the original width. It is not suited for structural glazing, traffic-bearing joints or continuous water immersion. Cured beads remain mildew resistant but can be stained by certain industrial chemicals or solvents.

How it compares

Measured against everything we stock in Axes, Hatchets, Picks & Mauls, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 82% of the 117 comparable items (median $18.99).

Specifications

Product
Brand nameDAP
Product typeAxes & Wedges

Questions about this item

What joint width can the 25 % movement capability handle?

Class 25 rating means the cured sealant stretches or compresses up to 25 % of the original joint width without losing adhesion.

Which surface preparation step is most often skipped before applying the silicone?

Removing all old caulk, dust and oils so the fresh bead bonds directly to clean substrate.

When should the bead be inspected and possibly replaced?

Check annually for cracks or loss of flexibility; replace any section that no longer springs back when pressed.

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