Application:

• Designed for applications requiring a strong but flexible connection, such as joining materials with different coefficients of thermal expansion, e.g. glass to metal or glass to plastic
• Primerless adhesion to common materials including enameled and painted steel, aluminium, ceramics and glass as well as some engineering plastics
• Used as a formed in place gasket (FIPG) material
• Used in Engine Systems
• Neutrally cured adhesive for cold stores

Features and benefits:

• One-component adhesive/sealant
• It hardens at room temperature under the influence of air humidity.
• Alkoxy curing system
• Non-settling, paste-like consistency
• Easy to apply
• Cures to a hard, flexible rubber
• Excellent adhesion to many substrates
• Stable and flexible from -40°C (-40°F) to 180°C (356°F)
• Approved according to railway standard EN 45545-2, HL1(R22), HL2(R23, HL3(R24)

• Cure type: alkoxy
• Number of parts: One-component sealant

Durability and Storage

When stored at 30°C (86°F) or below in original, unopened containers, this product has a: usable life of 12 months from the date of production.

How to use

Preparation of the substrate

All surfaces must be clean and dry. Degrease and wash off any contaminants that may: impair adhesion. Suitable solvents include isopropyl alcohol, acetone or methyl ethyl ketone.

Good primerless adhesion can be achieved on a variety of substrates including enamelled and painted steel, aluminium, ceramics, glass and some plastics.
Substrates to which good adhesion is not generally obtained include PTFE, polyethylene, polypropylene and related materials.

For maximum adhesion, DOWSIL™ 1200 OS Primer is recommended. Apply a thin coat of primer by dipping, brushing or spraying. Allow primer to dry for 15 to 90 minutes at room temperature and 50% or higher relative humidity.

Application method

Apply a bead of DOWSIL™ 7091 Adhesive Sealant to one of the prepared surfaces, then quickly cover with the other substrate to be bonded.
When exposed to moisture, freshly applied material "leathes" after about 10-15 minutes.
minutes at room temperature and 50% relative humidity. All tooling should be completed before this skin forms. The surface is easily worked with a putty knife. The adhesive/sealant will dry in approximately 30 minutes.

Curing time

Once a skin has formed, cure continues inward from the surface. In 24 hours. DOWSIL™ 7091 Adhesive Sealant will cure to a depth of approximately 2 mm. Cure times will be extended at lower humidity levels and at very deep joint sections. Before shipping and packaging bonded components, it is recommended that users wait a sufficient time to ensure that the integrity of the adhesive is not compromised.

Tags:

Neutrally cured adhesive for cold stores