Technical Data Sheet

DOWSIL™ 790 Silicone Building Sealant

Ultra-low-modulus sealant for new and remedial construction joint sealing applications

Features &  Excellent performance even in building joints that experience extreme movement.
Benefits  Suitable for new and remedial construction.
 Extension/compression capability of +100/-50 percent.
 Excellent weathering properties and resistance to sunlight, rain, snow, and temperature
extremes.
 Excellent unprimed adhesion to masonry, concrete substrates.
 Easy application over a wide temperature range.

Composition  Ultra-low-modulus, one-part, neutral-cure silicone sealant.

Applications  DOWSIL™ 790 Silicone Building Sealant offers outstanding unprimed adhesion to
masonry and is particularly effective for sealing expansion and control joints, precast
concrete panel joints, Exterior Insulation and Finish Systems (EIFS) joints, curtainwall
joints, mullion joints, stone pavers, and many other construction joints. When used in
accordance with Dow application and testing recommendations, the sealant forms a
durable, flexible, watertight bond with many common building materials, including
combinations of stone, concrete, masonry, granite, marble, aluminum, painted
substrates, and glass.

Typical Properties
Specification Writers: These values are not intended for use in preparing specifications.

Test1 Property Unit Result

As Supplied
ASTM C 679 Tack-free Time, 50% RH hours 1
Curing Time, 50% RH, at 25°C (77°F), 3/8" Depth days 7–14
Full Adhesion, Cured Joint days 14–21
ASTM D 2202 Flow, Sag, or Slump None
CTM 98 Working Time minutes 10–20

1. ASTM: American Society for Testing and Materials.

CTMs (Corporate Test Methods) correspond to standard ASTM tests in most instances. Copies of CTMs are available
upon request.

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DOWSIL™ 790 Silicone Building Sealant

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Typical Properties (Cont.)

Test Property Unit Result

EPA Method 24 VOC Content2, Maximum g/L 23
As Cured – After 7 Days at 25°C (77°F) and 50% RH
ASTM C 661 Durometer Hardness, Shore A points 15
ASTM D 412 Tensile Strength, Maximum psi (kg/mm2) 100 (0.070)
ASTM C 794 Peel Strength lb/in (kg/cm) 25 (4.46)
ASTM C 1135 Tensile
At 25% Extension psi (kg/mm2) 15 (0.010)
At 50% Extension psi (kg/mm2) 20 (1.015)
ASTM C 719 Joint Movement Capabilities
Extension/Compression % +100/-50
ASTM C 1248 Staining, Various Substrates None

2. Based on South Coast Air Quality Management District of California. Maximum VOC is listed both inclusive and
exclusive of water and exempt compounds.

Description Suitable for new construction or remedial applications, DOWSIL™ 790 Silicone Building
Sealant provides excellent performance, even in building joints that experience extreme
movement. It places a low stress on the sealant/substrate bond line to minimize failures in
moving joints.

DOWSIL™ 790 Silicone Building Sealant is available in 11 colors: black, precast white,
gray, natural stone, bronze, adobe tan, blue spruce, rustic brick, sandstone, charcoal, and
dusty rose. Custom colors are available upon request.

Approvals/ This sealant meets or exceeds the requirements of:

Specifications
 ASTM Specification C 920, Type S, Grade NS, Class 100/50, Use T, NT, M, G, A, and
O
 Many UL wall/floor fire designs, some without a protective cover plate (see www.ul.com
for current listing)
 Fire Tests of Building Construction and Materials, UL 263 (ASTM E 119)

Data from an independent test lab and Sealant, Waterproofing and Restoration Institute
validation are available from Dow and the SWR Institute. A complete product specification
sheet for this product is available upon request.

How to Use Consult the current version of the Dow Americas Technical Manual, Form No. 62-1112, for
detailed information on application methods, joint design, field testing, and warranty
requirements when using Dow sealants. Please contact your local sales application
engineer for specific advice.

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow

DOWSIL™ 790 Silicone Building Sealant

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How to Use (Cont.)

Handling PRODUCT SAFETY INFORMATION REQUIRED FOR SAFE USE IS NOT INCLUDED IN
Precautions THIS DOCUMENT. BEFORE HANDLING, READ PRODUCT AND SAFETY DATA SHEETS
AND CONTAINER LABELS FOR SAFE USE, PHYSICAL AND HEALTH HAZARD
INFORMATION. THE SAFETY DATA SHEET IS AVAILABLE ON THE DOW WEBSITE AT
DOW.COM, OR FROM YOUR DOW SALES APPLICATION ENGINEER, OR
DISTRIBUTOR, OR BY CALLING DOW CUSTOMER SERVICE.

Usable Life and When stored at or below 32°C (90°F), DOWSIL™ 790 Silicone Building Sealant has a shelf
Storage life of 12 months from date of manufacture. Refer to product packaging for “Use By” date.

Packaging DOWSIL™ 790 Silicone Building Sealant is packaged in 10.3 fl oz (305 mL) disposable
Information cartridges that fit ordinary caulking guns, 20 fl oz (590 mL) E-Z Pak foil sausages that fit
caulking guns, and also in 2.0 and 4.5 gal (7.5 and 17 L) bulk pails. It can be dispensed by
many air-operated guns and most types of bulk dispensing equipment.

Limitations DOWSIL™ 790 Silicone Building Sealant should not be applied:

 In structural applications.
 Below grade or to materials that outgas, which can cause bubbling in curing sealant.
 On brass or copper or other similar material that can be corroded.
 To surfaces that are continuously immersed in water.
 For use as an interior penetration firestop sealing system.
 To building materials that bleed oils, plasticizers, or solvents – materials such as
impregnated wood, oil based caulks, green or partially vulcanized rubber gaskets, or
tapes or bituminous below-grade waterproofing and asphalt-impregnated fiberboard.
 In totally confined spaces because the sealant requires atmospheric moisture for cure.
 To surfaces that will be painted after application. The paint film will not stretch with the
extension of the sealant and may crack and peel and most likely will not adhere to the
sealant.
 To surfaces in direct or indirect contact with food.
 To wet or frost-laden surfaces.
 In applications where solvents or primers are not fully dried prior to sealant application.
Uncured sealant is very sensitive to many solvents, primers, and cleaning agents; these
may cause the sealant to remain uncured or tacky.

®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow

DOWSIL™ 790 Silicone Building Sealant

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Limitations (Cont.) This product is neither tested nor represented as suitable for medical or pharmaceutical
uses.

Health and To support customers in their product safety needs, Dow has an extensive Product
Environmental Stewardship organization and a team of product safety and regulatory compliance specialists
available in each area.
Information
For further information, please see our website, dow.com or consult your local Dow
representative.

Disposal Dispose in accordance with all local, state (provincial) and federal regulations. Empty
Considerations containers may contain hazardous residues. This material and its container must be
disposed in a safe and legal manner.

It is the user’s responsibility to verify that treatment and disposal procedures comply with
local, state (provincial) and federal regulations. Contact your Dow Technical Representative
for more information.

Product Dow has a fundamental concern for all who make, distribute, and use its products, and for
Stewardship the environment in which we live. This concern is the basis for our product stewardship
philosophy by which we assess the safety, health, and environmental information on our
products and then take appropriate steps to protect employee and public health and our
environment. The success of our product stewardship program rests with each and every
individual involved with Dow products - from the initial concept and research, to manufacture,
use, sale, disposal, and recycle of each product.

Customer Notice Dow strongly encourages its customers to review both their manufacturing processes and
their applications of Dow products from the standpoint of human health and environmental
quality to ensure that Dow products are not used in ways for which they are not intended or
tested. Dow personnel are available to answer your questions and to provide reasonable
technical support. Dow product literature, including safety data sheets, should be consulted
prior to use of Dow products. Current safety data sheets are available from Dow.

dow.com NOTICE: No freedom from infringement of any patent owned by Dow or others is to be inferred. Because use conditions and
applicable laws may differ from one location to another and may change with time, Customer is responsible for determining
whether products and the information in this document are appropriate for Customer's use and for ensuring that Customer's
workplace and disposal practices are in compliance with applicable laws and other government enactments. The product shown
in this literature may not be available for sale and/or available in all geographies where Dow is represented. The claims made
may not have been approved for use in all countries. Dow assumes no obligation or liability for the information in this document.
References to "Dow" or the "Company" mean the Dow legal entity selling the products to Customer unless otherwise expressly
noted. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED.

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