Regardless of how harsh the environment or how extreme the temperature, we are sure to have a Dowsil® sealant to meet your needs.
This guide will assist you in selecting the best sealant for your specific application needs. A technical data sheet is available for all products.
Acetoxy
Dowsil® Silicone AP Adhesive/Sealant
Primary Use: General-purpose bonding and sealing. Good adhesion to many substrates.
Applications: Sealing and bonding appliance parts; making formed-in-place gaskets for compressors, gearboxes, and pumps. 1
Dowsil® 730 Solvent Resistant Adhesive/Sealant
Primary Use: Sealing and bonding where resistance to fuels, oils, and solvents is required.
Applications: Assembling and repairing fuel lines and tanks; bonding components exposed to fuels, oils, and solvents; making formed-in-place gaskets for chemical compressors, fluid-filled distributors, and transformers; repairing rubber linings exposed to corrosive conditions; sealing pipe joints on lines carrying corrosive chemicals. 1
Dowsil® 732 Multi-Purpose Sealant
Primary Use: General-purpose bonding and sealing; making formed-in-place gaskets. Complies with FDA, NSF, and MIL specifications.
Applications: Sealing flashing, vents, flues, gutters, marine cabins, and windows; sealing electrical boxes; caulking joints in sheet metal stacks and ductwork; bonding appliance parts, signs, and sign letters; adhering auto trim, appliance trim, and nameplates; making formed-in-place gaskets for compressors, gearboxes, and pumps. 1
Dowsil® 734 Flowable Adhesive/Sealant
Primary Use: To fill voids, cracks, and crevices; conformal coating for connections and battery terminals.
Applications: Coating mechanical devices; making formed-in-place gaskets for compressors, gearboxes, and pumps; potting electrical terminals; sealing ammunition fuses, trailers, and truck cabs. 1
Dowsil® 736 Heat Resistant Sealant
Primary Use: Sealing and bonding applications exposed to temperatures up to 315°C.
Applications: Sealing industrial ovens and boilers, fired heaters, access doors, moving oven belts, and drying ovens; bonding appliance parts and electrical/electronic equipment. 1
Dowsil® 752 Adhesive/Sealant
Primary Use: General-purpose bonding and sealing exposed to temperatures up to 200°C.
Applications: Sealing and bonding appliance parts; outdoor applications; making formed-in-place gaskets. 1
Dowsil® Q3-1566 Heat Resistant Adhesive/Sealant
Primary Use: Sealing and bonding applications exposed to temperatures up to +275°C (with short peaks up to +350°C).
Applications: Sealing industrial and domestic ovens, fired heaters, access doors, ceramic hobs, cookers, oil pans, and flanges in chemical plant equipment. 1
Dowsil® Q3-3379 Flowable Adhesive/Sealant
Primary Use: Sealing and bonding applications exposed to temperatures up to +250°C (with short peaks up to +275°C) where a flowable product is required.
Applications: Sealing steam irons, domestic and industrial ovens; bonding appliance parts. 1
Oxime
Dowsil® 3559 Neutral Cure Sealant
Primary Use: General manufacturing assembly operations where a relatively quick cure and good adhesion are important.
Applications: OEM and assembly applications; substitute for mechanical fasteners on appliances; adhering plastic moldings to plastic substrates; waterproofing components and housings of electrical devices. 1
Alkoxy
Dowsil® 7091 Adhesive/Sealant
Primary Use: General-purpose bonding and sealing; making formed-in-place gaskets.
Special Characteristics: Strong unprimed adhesion to commonly used materials, including enameled and painted steel, aluminum, ceramic, glass, and many engineering plastics.
Applications: Suitable for applications requiring a strong but flexible bond, such as bonding materials with different thermal expansion rates (e.g., glass to metal or glass to plastic). 1
Dowsil® 7093 Adhesive/Sealant
Primary Use: General-purpose bonding and sealing, low modulus.
Applications: Used where a low modulus and neutral cure are required. 1
Dowsil® 7096 Adhesive/Sealant
Primary Use: General-purpose bonding and sealing, translucent.
Applications: Suitable where a clear, neutral-cure product is required. 1
Dowsil® 748 Noncorrosive Sealant
Primary Use: Electrical sealing applications; food processing and transportation applications.
Applications: Bonding and sealing electrical equipment, power and control connections, motors, cover plates, instrument lenses, regulators, junction boxes, and control panels; sealing refrigerator and freezer liners. 1
Dowsil® 3140 RTV Coating
Primary Use: Sealing and bonding applications where self-leveling flow characteristics and non-corrosive cure are required.
Applications: Bonding and sealing electrical equipment, cables, and connectors; coating cover plates.1
Dowsil® 3145 Adhesive/Sealant
Primary Use: MIL-specified, high bond strength.
Applications: Sealing and bonding electrical equipment, housings, modules, motors, and instruments. 1
Dowsil® HM-2500 & HM-2510 Assembly Sealant
Primary Use: Assembly, bonding, sealing, gasket, and other applications requiring instant adhesion and high green strength.
Special Characteristics: 100% silicone; instant adhesion; ultra-clear; cures to a long-lasting silicone sealant.
Applications: Hot melt reactive sealant suitable for OEM and assembly applications; provides excellent adhesion to most substrates without primer. Offers instant adhesion for quick shipment, long open time, long pot life, and low VOC content.
Primers and Cleaners
Dowsil® 1200 RTV Prime Coat
Primary Use: Significantly improves the adhesion of silicone sealants to a wide variety of challenging substrates.
Applications: Enhances adhesion of silicone sealants, coatings, and rubber to masonry, wood, granite, metals, glass, ceramics, plastics, rubbers, and coatings.
Dowsil® OS 1200 Primer
Primary Use: Significantly improves the adhesion of silicone elastomers, foams, and adhesives/sealants.
Applications: General-purpose adhesion promoter. Formulated for low toxicity; not classified as a health hazard under European Directive 88/379/EEG.
1Most paints will not adhere to sealant; not for underwater structural or adhesive applications; requires atmospheric moisture to cure. May stress crack some plastics; test before use. 2Estimated service temperatures based on product formulation and laboratory testing. Actual serv ice temperature range is dependent on other factors including the specific application environment.
Dowsil® Silicone Sealants Designed for Industrial Assembly and Maintenance
Silicon-based Dowsil sealants last longer and are more versatile than most organic polymer sealants.
They are durable, one-part RTV sealants, cure at room temperature to a tough, rubbery solid with exceptional performance characteristics, and meet a wide variety of your industrial bonding and sealing needs.
Features of Dowsil® Silicone Sealants Include:
- Stability over a wide temperature range – When fully cured, our products can be used at temperatures ranging from -65° to 350°C.
- Weather resistance – High resistance to UV rays, radiation and weather prevents our products from hardening, cracking, crumbling, drying and becoming brittle.
- Chemical stability – Our sealants do not readily degrade even under long-term exposure to many chemicals and atmospheric pollutants.
- Good bond strength – Our products provide good adhesion to a wide variety of industrial materials, including glass, ceramics, and wood masonry, painted surfaces, and many metals and plastics.
- Electrical properties – Designed for a variety of applications, our products can be used in various electrical and electronic applications, including devices that are thermally cycled over a wide temperature range.
- Low flammability – In fire conditions, silicone adhesives/sealants are reluctant to burn. Many products comply with UL flammability standards.
When you specify an assembly and maintenance product from Dowsil, you receive a solution backed by the world leader in silicone technology with more than 60 years of expertise and innovations.
Innovative Technology
Reactive hot-melt silicone technology provides high green strength which can increase productivity, improve quality and reduce costs in industrial assembly applications.
Dowsil® HM-2500 Assembly Sealant is a patented, neutral-cure reactive hot-melt silicone that is ideal for automated applications in the manufacturing of various components.
When used with standard hot-melt dispensing equipment and an automated robot, HM-2500 becomes part of the productivity solution that enables parts to be produced faster, better, and more economically.
Key Advantages
- Immediate Green Strength – move parts efficiently from one processing step to the next
- No “Hold Time” Required – ship parts as fast as you make them
- Long Pot Life, Long Open Time – material is not heat activated and, therefore, does not cure in line whereby the long open time ensures flexibility in the assembly process
- Aggressive Adhesion – excellent primerless adhesion to metals, plastics, wood, and paints
- Crystal Clear – ultra clear or select colors
- Worker Friendly – non-hazardous formulation, very low odor, very low VOC (volatile organic compound)
- Neutral-Cure 100% Silicone Chemistry – cures to flexible, weather-resistant, silicone elastomer with outstanding durability and UV resistance
Substrate Preparation
Although Dowsil silicone sealants possess excellent bond strength, maximum adhesion is only attained on surfaces that are clean and dry.
Contaminants such as dirt, grease, water, tar, or rust act as release agents and prevent the formation of durable bonds.
It is strongly recommended that wet or unclean surfaces be properly prepared before applying sealants.
- Wipe contaminated surfaces with a clean, oil-free cloth.
- Rewipe the surface with a suitable cleaner or industrial solvent, such as IPA, mineral spirits, naphtha, or ketones.
- Note: Do not clean surfaces with detergent or soap. Soap residue may act as a release agent.
- Roughen rubber surfaces with sandpaper.
- Perform a spot check to determine adhesion for each application.
- Bond strength will increase as the sealant cures.
How to Apply
Apply Dowsil adhesives/sealants to one of the prepared surfaces, then quickly cover with the other substrate to be bonded.
Upon exposure to moisture, the freshly applied material will “skin over” in about 5–10 minutes (depending on product) at room temperature and 50% relative humidity.
- Any tooling should be completed before this skin forms.
- The surface can be easily tooled with a spatula.
Use of Primer
For maximum adhesion, the use of a Dowsil primer is recommended.
- After solvent cleaning, apply a thin coat of Dowsil primer by wiping, brushing, or spraying.
- At normal room conditions (temperature and 50% relative humidity), allow the primer to air dry for 5–30 minutes.
- The primer cures by contact with air moisture; low humidity will require a longer drying time.
- Determine the required drying time for the specific area before use.
- Primer that has cured extensively will no longer promote adhesion.
- As a general rule, avoid drying times longer than 6 hours at normal conditions.
Cure Time
After skin formation, curing continues inward from the surface.
- In 24 hours (at room temperature and 50% relative humidity), Dowsil adhesive/sealant will cure to a depth of approximately 3 mm.
- Deep sections or areas with restricted access to atmospheric moisture will require longer cure times.
- Cure time is extended at lower humidity levels.
Since sealants cure by reaction with air moisture, keep containers tightly sealed when not in use.
A plug of cured material may form in the tip of a tube or cartridge during storage—this is easily removed and does not affect the remaining contents.
Compatibility
Some Dowsil adhesives/sealants release a small amount of acetic acid during cure.
This may cause corrosion on some metallic parts or substrates, especially:
- in direct contact, or
- when curing occurs in a totally enclosed environment that prevents by-products from escaping.
Health and Environmental Information
Dowsil maintains an extensive Product Stewardship organization and a team of Product Safety and Regulatory Compliance (PS&RC) specialists available in each region.
Performance Lubricants is the authorized distributor of Dowsil® products for Romania, Moldova, Serbia, Bulgaria, Bosnia, Kosovo, Montenegro, and Albania.
With over 30 years of experience in the field, our team of specialists provides reliable consultancy and assistance in identifying the right lubricants for your specific needs.
Contact us now to benefit from our expertise.