Technical Data Sheet

DOWSIL™ 795 Structural Glazing Sealant

One-part, neutral-cure silicone sealant

Features & • Meets ASTM C1184 for Structural Silicone Sealant

Benefits • Meets ASTM C719 Class 50 High movement capability ±50% in well designed
weatherseal joint
• Excellent adhesion to a wide range of substrates including glass, anodized and coated
aluminum profiles
• Non corrosive cure system
• Ease of use – all-temperature gunnability and easy tooling
• The cured product exhibits excellent weathering characteristics, and a high resistance
to ultra-violet radiation, heat and humidity
• High ultimate tensile strength which makes it suitable for structural bonding applications
• Excellent mechanical properties

Composition • One-part, neutral-cure, RTV silicone sealant

Applications • DOWSIL™ 795 Structural Glazing Sealant is a one-component Silicone sealant

designed for site or factory glazing and curtainwall production. It requires contact with
air as it reacts with atmospheric moisture to cure to a tough but flexible silicone rubber.
DOWSIL™ 795 Structural Glazing Sealant can be used where dual structural and
weatherseal applications are desired. It has up to ±50% movement capability in a well-
designed weatherseal joint.

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 1.5 ( max)
Curing time at 25°C, 50% RH days 7–14
Full adhesion days 14–21
ASTM C 639 Flow, sag or slump mm 0
Working time minutes 20–30
Specific gravity

1. ASTM – American Society for Testing and Materials.

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Typical Properties (Cont.)

Test Property Unit Result

VOC content2 g/l 32
As cured - 7 days at 25°C (77°F), 50% RH
ASTM D 412 Tensile strength (ultimate) MPa 2.3
Elongation % 670
ASTM C 661 Durometer hardness, Shore A points 35
ASTM D 624 Tear strength, die B kN/m 13
As cured – after 21 days at 25°C (77°F), 50% RH
ASTM C 794 Peel strength kg/cm 8.5
ASTM C 1135 Tensile strength, at 100% elongation MPa 0.6
Ultimate tensile strength, at break MPa 1.2
Ultimate elongation at break % 400
ASTM C 719 Joint movement capability % ±50
As cured – after 21 days at 25°c, 50% relative humidity followed by 5,000 hours in a quv weatherometer, ASTM G 154-06
ASTM C 1135 Tensile strength, at 100% elongation MPa 0.6
Ultimate tensile strength, at break MPa 1.1

2. Based on South Coast Air Quality Management District of California. Maximum VOC is listed both inclusive and
exclusive of water and exempt compounds. For a VOC data sheet for a specific sealant color, please send your
request to Dow.

Description DOWSIL™ 795 Structural Glazing Sealant is a one-part, neutral-cure, architectural-grade

sealant that easily extrudes over a wide temperature range. This cold-applied, non-sagging
silicone material cures to a medium- modulus rubber upon exposure to atmospheric
moisture. The cured sealant is durable and flexible enough to accommodate ±50%
movement of original joint dimension when installed in a properly designed weatherseal
joint. In a properly designed structurally glazed joint, the sealant is strong enough to support
glass and other panel materials under high wind-load and seismic effects.

Approvals/ DOWSIL™ 795 Structural Glazing Sealant meets the requirements of: ASTM Specification
Specifications C 1184 for structural silicone sealants ASTM Specification C 920, Class 50.
SGBP 2019-2721

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Colors DOWSIL™ 795 Structural Glazing Sealant is available in 4 colors: black, white, gray and
bronze.

How to Use When DOWSIL™ 795 Structural Glazing Sealant is used in structural applications the
structural joint design MUST be reviewed by a technical service specialist.

Complete design and installation guidelines are contained in the Asia Technical Manual,
and must be followed for warranty applications when using this product.

Joint Design Structural joints sealed with DOWSIL™ 795 Structural Glazing Sealant should have a
minimum depth (or bite) of 6 mm. For large site- glazed joints the sealant or bite should be
not more than 12 mm when the sealant can cure from one side only. When an open-cell
moisture-permeable spacer tape is used, a structural bite up to 24 mm can cure to optimum
strength. The exact structural bite should always be calculated. The thickness of the
structural sealant joint or glueline should be 6 mm minimum. As it must accommodate
thermal and dynamic movements the actual joint movements should be calculated. Ideally
the bite to glueline ratio should be not more than about 3:1.

Accessory The appropriate selection of all accessories such as setting blocks and backing materials is
Selection important to avoid discoloration or adhesion-related problems due to incompatibility. Dow
will also assess the suitability of proposed accessory materials as part of the standard
testing services. Silicone-based setting blocks are generally recommended for best
compatibility.

Preparatory Work Thoroughly clean all substrates to be sealed, removing all contaminants such as grease, oil,
dust, frost or water. All metal, glass, or other surfaces should be cleaned with the
recommended solvent, using a lint free cloth.

Method of Install backing material or joint filler, setting blocks, spacer shims and tapes. Mask areas
Application adjacent to joints to ensure neat sealant lines. Apply DOWSIL™ 795 Structural Glazing
Sealant in a continuous operation using 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 minutes), tool the sealant with light pressure to
spread the sealant against the backing material and joint surfaces. Remove masking tape
as soon as the bead is tooled.

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.

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Usable Life and When stored at or below 27°C (80°F), DOWSIL™ 795 Structural Glazing Sealant has a shelf
Storage life of 12 months from the date of manufacture. Refer to product packaging for “Use By
Date.”

When stored at or below 27°C (80°F), DOWSIL™ 795 Structural Glazing Sealant has a shelf
life of 12 months from the date of manufacture. Refer to product packaging for “Use By
Date.”

Questions about the use of DOWSIL™ 795 Structural Glazing Sealant can be answered by
calling your local application sales engineer. Our laboratory personnel and technical service
staff are also available for assistance.

Packaging DOWSIL™ 795 Structural Glazing Sealant is supplied in 300 ml disposable plastic cartridges
Information and 600 ml foil sausages.

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

DOWSIL™ 795 Structural Glazing Sealant should not be used for structural applications
without the prior written approval of the Construction Industry Technical Services
Department. Each project should be specifically and separately approved by Dow.

Project specific approval involves the following prerequisites:

• Joint dimensioning and print reviews.

• Successful laboratory adhesion and compatibility testing to all building components.
• Observance of professional sealant application and workmanship standards.
• Users should always consult the Technical Services Department for adhesion
recommendation.

Dow shall not be held liable for any possible claims arising from structural glazing use of
DOWSIL™ 795 Structural Glazing Sealant for projects which have not been specifically
approved by Dow.

For projects which have been approved, Dow will issue a structural adhesion warranty on a
case by case basis at the user's request. It is the user's exclusive responsibility to ensure
project compliance with local building regulations.

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.

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dow.com LIMITED WARRANTY INFORMATION – PLEASE READ CAREFULLY
The information contained herein is offered in good faith and is believed to be accurate. However, because conditions and
methods of use of our products are beyond our control, this information should not be used in substitution for customer’s tests
to ensure that our products are safe, effective, and fully satisfactory for the intended end use. Suggestions of use shall not be
taken as inducements to infringe any patent.

Dow’s sole warranty is that our products will meet the sales specifications in effect at the time of shipment.

Your exclusive remedy for breach of such warranty is limited to refund of purchase price or replacement of any product shown
to be other than as warranted.

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, DOW SPECIFICALLY DISCLAIMS ANY OTHER
EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY.

DOW DISCLAIMS LIABILITY FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.

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