Silicone Sealant

Approx. Rs 600 / PieceGet Latest Price

Product Details:

Approx. Rs 260 / PieceGet Latest Price

Product BrochureProduct Details:

Overview:

• A one part, neutral cure, architectural grade sealant designed for general weathersealing. It easily extrudes in any weather an quickly cures at room temperature to produce a durable, flexible silcone rubber seal.

Features & Benefits

• Easy of use – all temperature gunability
• Primerless adhesion – upon curing will form a strong bond to most common building components without the use of a primer 
• Long-life reliability – cured sealant stays elastomeric from -50°C to 150°C without hardening, cracking or becoming brittle under normal weather conditions 
• Low Modulus – with extension/compression capability up to ±50% of original joint width 
• Excellent weatherability, virtually unaffected by sunlight, rain, snow, ozone 
• Ease of application – ready to use as supplied 

How To Use
Please consult the technical manual. Please contact your local sales application engineer for specific advice.
Preparation

• Clean all joints, removing all foreign matter and contaminants such as grease, oil, dust, water, frost, surface dirt, old sealants or glazing compounds and protective coatings.

Application Method 

• Install backing material or joint filler, setting blocks, spacer shims and tapes. Mask areas adjacent to joints to ensure neat sealant lines. Primer is generally not required on nonporous surfaces, but maybe necessary for optimal sealant of certain porous surfaces. A test placement is always recommended. Apply DOWSIL 789 Silicone Weatherproofing Sealant in a continuous operation using a positive pressure. (The sealant can be applied using many types of air-operated guns and most types of bulk dispensing equipment.) Before a skin forms (typically within 15~20 minutes), tool the sealant with light pressure to spread the sealant against backing material and the joint surfaces. Remove masking tape as soon as the bead is tooled.

Approvals

• Meets the requirements of: KS F 4910-2000 F25LM 

Handling Precautions

• Product Safety Information Required for Safe Use Is Not Included in This Document. Before Handling, Read Product and Safety Data Sheets and Container Labels for Safe Use, Physical and Health Hazard Information. 

Usable Life And Storage

• When stored at or below 30°C (86°F) in the original unopened containers, DOWSIL 789 Silicone Weatherproofing Sealant has a usable life of 12 months from the date of manufacture. Refer to product packaging for “Use By” date. 

Packaging Information

• This product is available in 300 ml disposable cartridges and in 500 ml foil sausages depending on location of purchase.

Limitations
DOWSIL 789 Silicone Weatherproofing Sealant is not approved for use as a structural sealant.
DOWSIL 789 Silicone Weatherproofing Sealant should not be used:

• In below-grade applications 
• When surface temperatures exceed 50°C (122°F) 
• On surfaces that are continuously immersed in water 
• On building materials that bleed oils, plasticizers or solvents, green or partially vulcanized rubber gaskets or tapes 
• On frost-laden or wet surfaces 
• In totally confined joints (the sealant requires atmospheric moisture for cure) 
• If the sealant is intended to be painted (paints do not typically adhere to most silicone sealants) 
• To surfaces in direct contact with food or other food-grade applications 

Approx. Rs 130 / PieceGet Latest Price

Product BrochureProduct Details:

Overview:

• A cost effective, one-part, acetoxy cure silicone sealant for general purpose applications. It provides a flexible bond and will not harden or crack. It is a high performance sealant, with +-25% movement capability when properly applied. It offers long term durability in a range of general sealing or glazing applications on glass, aluminum, painted surfaces, ceramics, fiberglass, and non-oily wood. Clear and white options meet the requirements of FDA Regulation 21CFR 177.2600.

Features & Benefits

• Cures to 100% silicone rubber 
• Resistant to sunlight and weather extremes 
• Fast cure, high strength 
• Clear and white formulations meet the requirements of FDA Regulation 21 CFR 177.2600 
• Remains flexible; will not become brittle, crack, shrink or chalk 
• Bonds to many common substrates 
• Supplied is removable, reusable, resealable nozzle that saves time and sealant

How To Use
1. Refer to product packaging for use-by date.
2. Temperature. Apply sealant at temperatures between -20 and 122°F (-29 and 50°C) for best results.
3. Prepare surface. Cut out and remove all old caulk for repair applications.
4. Clean, Two-Step. First, apply solvent to a lint-free cloth and vigorously wipe bonding surfaces to remove dirt and residues. Next, use a dry wipe to remove remaining solvent and residue for optimum cleaning. Repeat if necessary. Surfaces must be clean, dry, oil- and frost-free for best results. (Recommended solvents include isopropyl alcohol, toluene, xylene, naphtha or similar solvent.) Always wear gloves and follow safety precautions and directions on solvent container. DO NOT USE gasoline or kerosene.
5. Install. 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.
6. Mask. Apply masking tape to areas adjacent to the joint to ensure straight bead lines and easy cleanup. Remove masking tape immediately after the bead is completed and before a skin forms.
7. Open cartridge. Cut snub nose above threads, reattach and cut nozzle to desired size. Insert into a caulking gun.
8. Apply. Extrude sealant with a smooth, steady motion, and ensure complete fill of joint cavity before proceeding.
9. Tool. Tool the sealant immediately after application and before a skin forms. Remove masking immediately after tooling.
10. Replace cartridge cap. See “Usable Life and Storage” instructions

Cleanup Instructions
1. Cleanup should start immediately after sealant has been applied/ tooled and masking tape has been removed.
2. While wearing solvent-resistant gloves, wipe off excess sealant from surfaces and tools with a solvent- moistened cloth within 10 minutes of application.
3. If excess sealant is completely cured, carefully cut or scrape away.
4. Avoid contact of uncured sealant with skin and clothing. If contact does occur, wipe with clean rags and wash with water.

Handling Precautions

• Product Safety Information Required for Safe Use Is Not Included in This Document. Before Handling, Read Product and Safety Data Sheets and Container Labels for Safe Use, Physical and Health Hazard Information. 

Limitations

• Not for structural glazing 
• Not paintable 
• Not suited for prolonged submersion in water or below-grade applications 
• May not adhere to oily woods or be compatible with substrates made of methylmethacrylate, polycarbonate, polypropylene, polyethylene and polytetrafluoroethylene