Joint Design

• Correct joint design should have minimum joint width of 6mm, minimum joint depth of 6mm.
• For larger joints, the width of the joint should be greater than the sealant depth.
• Avoid 3-sided adhesion; apply backer rod or bond breaker tape in the base of the joint to ensure the sealant is only bonded to the sides of the joint and is free to move to its full capacity under joint movement.

 Preparation and Cleaning

• Substrates must be clean prior to application to ensure adhesion durability.
• All surfaces must be clean from contaminants and residues such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings.
• Solvent should be wiped on and off with clean, oil- and lint-free cloths.
• DOWSIL™ R-40 Cleaner is recommended for cleaning of non-porous substrates.
• The ventilation time at room temperature should be at least 1 minute.
• Please contact your local technical service expert for more information.

Priming

• For each project separately, it is essential that adhesion to all concerned surfaces should be tested before application.
• If adhesion requires priming, a primer such as DOWSIL™ 1200 OS Primer is in general recommended for metal substrates and DOWSIL™ Primer P for mineral substrates.
• While priming, note the ventilation time at room temperature which is indicated on the primer label.
• Priming should be done within 4 hours after cleaning.
• If there is a greater time delay, cleaning process has to be repeated again.
• Project specific priming regulation needs to be discussed and approved by your local technical department.
• Please contact your local technical service engineer for further assistance.

Installation

• Install back-up spacing material for better filling, especially if the width exceeds 1/2" to maximize bonding results.
• Open-cell polyethylene foam backer rod can be used.

Masking

• Apply masking tape to areas adjacent to the joint to ensure straight bead lines and easy clean-up.
• Remove masking tape immediately after the bead is completed and before a skin is formed.

 Open cartridge 

Cut snub nose above threads, reattach and cut nozzle to desired size. Insert into a caulking gun.

Application

Extrude sealant with a smooth, steady motion, and ensure complete fill of joint cavity before proceeding.

Tool

Tool the sealant immediately after application and before a skin forms. Remove masking immediately after tooling.

Replace cartridge cap

See “Shelf Life and Storage” instructions.

DOWSIL™ DC-1000 Silicone Sealant is neither tested nor represented as suitable for medical or pharmaceutical uses. Before handling, read the separate Material Safety Data Sheet (MSDS) and container label for safe use, physical and health hazard information. This product is –

• Not for structural glazing applications
• Not paintable 
• Not suited for prolonged submersion in water or below-grade applications 
• May not adhere to oily woods 
• May not be compatible with substrates made of methyl methacrylate, polycarbonate, polypropylene, polyethylene and polytetrafluoroethylene 
• Not suitable for surfaces that might bleed oils, plasticizers or solvents
• Not suitable for porous surfaces such as cement-like materials, stone or surfaces prone to attack by weak acids 
• Need to check for compatibility with natural stones, plastics before application
• Do not clean or treat the sealant with materials, solvents or leaning agents that may affect or discolor the sealant, particularly during
• This sealant has not been tested to determine status under U.S. Food and Drug Administration regulations.
• Not recommended for direct contact on the reflective coatings on mirrors
• May not cure properly if used in spaces confined from atmospheric moisture 
• May cause corrosion on some brass, copper, zinc or zinc alloy-containing fixtures (galvanized) 
• Not for use where there is abrasion or physical damages