Dowsil silicone sealants

Description

[Dow] Dow produces numerous types of one-part, neutral-cure Silicone material that can be used as adhesives/sealants. These room temperature vulcanizing (RTV) silicones were introduced in the 1960s and cure upon exposure to atmospheric moisture. They have been used for case manufacturing in case construction and mount fabrication. Their general properties include:

• Stability over a wide temperature range – When fully cured, many of our products can be used at temperatures ranging from -85° to 599°F (-65° to 315°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.

Commercial name	Manufacturer	Polymer type	MWG other comments	Applications & Working Properties	Manufacturers listed Applications	Maufacturers Descriptions (Characteristics and Risks)	Oddy tests	Product website	Composition and fillers
Dowsil 580 Neutral cure	Dow Corning	Silicone; oxime neutral cure; one component			General Glazing; Weathersealing applications for windows, doors, glass, metal, masonry	Will not corrode galvanized/zinc-coated steel or attack concrete; Resistant to weathering, UV, vibration, moisture, ozone, temperatures, pollutants, detergents and solvents; Long life reliability; cured sealant stays rubbery from -50°C to +150°C without tearing, cracking, drying out or becoming brittle; not recommended for water immersion; do not use on structural glazing; may discolor copper and brass; cannot be painted; not for use on polycarbonates	AWMM 2007 (T); AWMM 2008 (T)	Dowsil 580	Silicone elastomer (with petroleum distillates, 2-Butanone (methylsilylidyne)trioxime; N-(3-(Trimethoxysilyl) propyl)-1,2- ethanediamine; Vinyltri (methylethylketoxime) silane; Bis[(2-ethyl-2,5-dimethylhexanoyl)oxy](dimethyl)stannane)
Dowsil 737 Neutral Cure	Dow Corning	Silicone; oxime neutral cure; one component			Substitute for mechanical fasteners on large and small appliances; Adhering plastic moldings to plastic substrates for trim applications; Waterproofing electrical components	Oxime cure in the presence of moisture; adhesion to most material; excellent weather resistance; Not recommended for water immersion, or use on painted surface; may discolor brass, or copper; may stress craze polycarbonates	MMA 2016 (U); BKM 2017 (U); BKM 2018 Px4) BKM 2018 (U)	Dowsil 737	Silicone elastomer( 2-Butanone (methylsilylidyne)trioxime; N-(3-(Trimethoxysilyl) propyl)-1,2- ethanediamine; Vinyltri (methylethylketoxime) silane; Bis[(2-ethyl-2,5-dimethylhexanoyl)oxy](dimethyl)stannane)
Dowsil 739 RTV	Dow Corning	Silicone; moisture cure; one component			Adheres well to unprimed metals, ceramis and glass and some plastics; does not adhere to teflon, polyethylene, polypropylene, or highly plasticized plastics or rubbers.	Single component, moisture cure, RTV with good adhesion; normally sold in syringes and cartridges;	MMA 2016 (P)	Dowsil 739	Silicone elastomer
Dowsil 791 WeatherproofSealant	Dow Corning	Silicone; moisture cure; one component	this is the one that Click Netherfield likes; white version is unsuitable (Oddy); Goppion uses this for 99% of projects, they use only black, grey, sometimes white; Goppion uses this due to good Met Oddy results	good for inside display envelope: glass and metal joins; glass and glass joins; Goppion uses black, grey, white due to aesthetic reasons...transparent caulks yellow within 5 years	General weathersealing joints; glazing and curtain wal seals; builing façade seals	Single component, neutral curing silicone elastomeric sealant for weathersealing applications;	MMA 2016 (T); AMNH 2019 (Tx2); MMA 2021 (T); is white unsuitable? what about other colors?	https://www.dow.com/en-us/pdp.dowsil-791-weatherproofing-sealant.04082594h.html#overview	Silicone elastomer
Dowsil 795 Building Sealant	Dow Corning	Silicone; moisture cure; one component		Click Netherfield does not like to use this due to workability; extra thick; skins over too quickly	Structural and nonstructural glazing; for most new construction and remedial sealing applications; weather sealing of most common construction materials including glass, aluminum, steel, painted metal, EIFS, granite and other stone, concrete, brick and plastics	Single component, neutral curing; Highly resistant to weather, UV and temperature extremes; adheres to wide wariety of materisls; not recommended for water immersion, or wet or cold surfaces; not paintable	AWMM 2008 (U); MMA 2016 (Px2); MMA 2020 (Ux2); MMA 2021 (T)	https://www.dow.com/en-us/pdp.dowsil-795-silicone-building-sealant.01595717z.html#tech-content	Silicone elastomer with Diisopropoxydi(ethoxyacetoacetyl)titanate
Dowsil 9-1374 Silicone sealant	Dow Corning	Silicone; alkoxy neutral cure; one component			Used for formed in place glaskets; provides strong flexible bond for movalble or expanding joints, such as when bonding materials with different thermal expansion rates such as glass to metal, or glass to plastic or metal to plastic	Single component, translucent, RT, alkoxy neutral moisture cure, silicone sealant.	MMA 2016 (Tx2)	https://www.dow.com//en-us/pdp.dowsil-9-1374-silicone-sealant.03119556h.html#overview	Silicone elastomer
Dowsil 3145 RTV Mil-A-46146 Adhesive / Sealant	Dow Corning	Silicone; moisture cure; one component		may be hard to work with (one anecdote of it being very hard to work with); requires experienced person to apply and clean up; viscous, does not flow	Sealing openings in modules and housings; Adding mechanical stability to individual components; adheres to glass and nylon	Good adhesion to many reactive metals, ceramics and glass, as well as to selected laminates, resins and plastics. However, good adhesion cannot be expected on non-reactive metal substrates or non-reactive plastic surfaces such as Teflon, polyethylene or polypropylene.	AWMM 1988 (P); BKM 2016 (Px2); BKM 2017 (Px2); AWNH 2019 (T)	https://www.dow.com//en-us/pdp.dowsil-3145-rtv-mil-a-46146-adhesive-sealant.01059548z.html#tech-content	Polydimethylsiloxane (with Methyltrimethoxysilane, Octamethyl Cyclotetrasiloxane, Methanol
Dowsil 7091 Adhesive Sealant	Dow Corning	Silicone; moisture cure; one component	Click Netherfield mentioned this one as one they use		for applications which demand a strong but flexible bond, such as when bonding materials with differing thermal expansion rates, e.g. glass to metal or glass to plastic	Single component alkoxy cure with moisture; for applications which demand a strong but flexible bond, such as when bonding materials with differing thermal expansion rates, e.g. glass to metal or glass to plastic; For maximum adhesion, the use of DOWSIL™ 1200 OS Primer is recommended.	BKM 2016 (P); BKM 2017 (P); MMA 2017 (P); AMNH 2019 (T)	https://www.dow.com//en-us/pdp.dowsil-7091-adhesive-sealant.02436621h.html#tech-content	Silicone elastomer (with Diisopropoxydi(ethoxyacetoacetyl)titanatel)
Dowsil 993	Dow Corning		Click Netherfield mentioned this one as one they use
Silastic 1080 RTV	Dow Corning	Silicone; one component			Provides reliable, long-lasting bonds with a wide range of substrates, including ceramics, metals, glass and filled plastics,	long service life, wide operating temperatures, resistance to oils and solvents; water and steam resistant	AWMM 1988 (P)	[1]	Silicone elastomer

Personal Risks

• Wear eye, hands, and respiratory protection.
• SDS: sheets

Collection Risks

Literature indicates the sealant has no significant volatile components. Some silicones have curing byproducts of ethanol, peroxides or ketones. Risk to museum collections could occur if an object comes in contact with the sealant causing possible staining or adhesion (if not fully cured).