Dow Corning® 732 RTV Multi-Purpose Sealant
General-purpose sealing and bonding as a space-filling rubber adhesive or a formed-in-place gasket
USES Dow Corning1'1732 RTV Multi-Purpose Sealant is designed for a number of diverse sealing and bonding applications. This sealant can be used for:
Adhering auto, aircraft and appliance trim, including metal, fabric and fabric-backed plastics
Bonding gaskets in heating and refrigeration units
Attaching screwless brackets, nameplates, signs and sign letters
Sealing windows in oven doors and flues on gas appliances, flanged pipe joints and access doors
Providing formed-in-place gaskets for gear boxes, compressors and pumps
Sealing trailers and truck cabs
Bonding and sealing appliance parts
Sealing marine cabins and windows
Filleting and caulking joints in sheet metal stacks, duct work and equipment housings
Protecting components from moisture from frequent wash downs or weathering
Sealing aircraft galleys and interiors
Will not slump, sag or run off surfaces
Non-flowable; can be applied without slumping or running off
Good resistance to weathering, moisture and temperature extremes
Broad temperature range performance; cured material stays flexible for continuous use from -76 to 350°F (-60 to 177°C) and up to 400°F (204° C) for intermittent use. In cases where slightly higher temperature performance is required, Dow Corning 732 Multipurpose Sealant - Black remains flexible for continuous use up to 40CTF (204°C) and intermittent use up to 450T (232°C).
Adheres to a variety of surfaces
100 percent silicone rubber
Meets the requirements of many industry standards, OEM applications and specifications
COMPOSITION One-part silicone rubber supplied as nonslumping paste
DESCRIPTION Dow Corning* 732 RTV Multi-Purpose Sealant is a paste-like, one-component silicone RTV designed for a wide variety of industrial sealing and adhesive applications. It cures at room temperature by reaction with moisture in the air to produce a durable, flexible silicone rubber.
USE LIMITATIONS Dow Corning 732 RTV Multi-Purpose Sealant is not recommended:
For continuous underwater immersion where adhesion or structural bonding is required
On concrete, brick, mortar or other masonry surfaces
*For bonding uncured sealant directly to hot surfaces
On surfaces to be painted; paints do not adhere well to sealant (paint before applying sealant)
On materials such as impregnated woods or oil-based caulks that bleed oils
In totally confined areas; atmospheric moisture is required for cure
On Teflon1 coated materials, polyethylene, polypropylene or methylmethacrylate (Plexiglas2); sealant will not adhere well
On or near sensitive metals such as copper, brass, zinc, carbon steel, galvanized iron or magnesium; these metals may be corroded, especially in confined cure conditions, due to the acetic acid released during the cure
This product is neither tested nor represented as suitable for medical or pharmaceutical uses.
1Registered trademark of E.I. duPont deNemours Co. 2Registered trademark of Pittsburgh Plate Glass
TYPICAL PROPERTIES These values are not intended for use in preparing specifications.
Flow, sag or slump
Aluminum, black, clear, white
Specific Gravity at 77°F (25°C)
Extrusion Rate (1/8-inch orifice,
90 psi air pressure)
Cure Characteristics - Exposed to Air at 77°F (25°C) and 50% RH
Cure Time, 1/8-inch bead
Physical Properties - As Cured 7 Days at 77°F (25°C) and 50% RH
Durometer Hardness, Shore A
CTM 0137 A
CTM 0137 A
BTU per ft-°F-hr
0.44 x 103
Electrical Properties - As Cured 3 Days at 77°F (25°C) and 50% RH
at 100 Hz
at 100 kHz
at 100 Hz
at 100 kHz
'CTMs (Corporate Test Methods) correspond to standard ASTM tests in most instances. Copies of CTMs are available upon request.
Specification Writers: Please obtain a copy of the Dow Corning Sales Specification for this product and use it as a basis for your specifications. It may be obtained from any Dow Coming Sales Office, or from Dow Corning Customer Service in Midland, MI. Call (517) 496-6000.
Complies with PDA Regulation 21 CFR 177.2600 for incidental contact with food
National Sanitation Foundation, List 51, for direct food contact, and List 61, for use with potable water
Recognized under UL QMFZ2
Meets the requirements of Military Specification MIL-A-46106
Meets a variety of commercial and OEM specifications
HOW TO USE Surface Preparation Clean surfaces using Dow Corning9 brand OS (ozone-safe) Fluids or other suitable solvent. Make sure the surface is free of any oil, soap or water. Slight abrasion of the surface may improve adhesion. Priming may be required on some surfaces for better adhesion.
Primer Recommendations For metals and many other substrates, Dow Corning'* 1200-OS Prime Coat or low-VOC Dow Corning*T5200 Adhesion Promoter is recommended. For paints, plastics and organic rubber materials, use Dow Corning"' 1205 Prime Coat.
Follow surface preparation guidelines above and apply a thin film of prime coat. Allow to dry about 1 hour. Follow complete instructions provided with the primer.
Mask adjacent surfaces to ensure neat sealant lines. If masking tape is used to mask an area, it must be removed before a skin forms.
Application Dow Corning 732 RTV Multi-Purpose Sealant is supplied in ready-to-use form. It extrudes readily from its container under pressure. Apply sealant in a continuous operation by holding the applicator at a 45° angle and pushing the adhesive ahead of the nozzle.
Tool, as needed, immediately after application and before a skin forms. Tooling should be completed within 5 to 10 minutes of application. Alternate periods of application and tooling may be required. A spatula or paddle can be used to too! the surface.
Cure Dow Corning 732 RTV Multi-Purpose Sealant cures at room temperature on exposure to water vapor in the air, giving off a small amount of acetic acid. Cure time is affected by relative humidity, degree of confinement and cross-sectional thickness of the sealant. Cure progresses inward from the surface. At conditions of 77°F (25°C) and 50 percent relative humidity, a tack-free skin forms within 20 minutes. Sections up to 1/8-inch thick become rubbery solids in about 24 hours at room temperature at 50 percent relative humidity. Higher relative humidity will make the sealant cure slightly faster,
Remove excessive adhesive with a dry paper towel. Remove masking as soon as tooling is completed.
USE LIMITATIONS This product is neither tested nor represented as suitable for medical or pharmaceutical uses.
STORAGE AND SHELF LIFE
When stored in original, unopened containers at or below 77°F (32°C), Dow Corning 732 Multi-Purpose Sealant has shelf life of 30 months from date of manufacture. Refer to product packaging for "Use By" date. Containers should be kept sealed when not in use.
After a container has been opened, a plug of cured material may form in the nozzle or tube tip during storage. When ready to reuse, unscrew the nozzle and remove the cured plug. The remaining sealant is ready to use.
PACKAGING Dow Corning 732 RTV Multi-Purpose Sealant is available in 3- and 4.7-fl oz (90-and 139-mL) tubes, 10.1-floz (300-mL) cartridges and 4.5-and 52-gal (17-and 197-L) containers. Clear and white colors are also available in a 10.3-fl oz (305-mL) squeeze tube kit,
SAFE HANDLING INFORMATION
PRODUCT SAFETY INFORMATION REQUIRED FOR SAFE USE IS NOT INCLUDED. BEFORE HANDLING, READ PRODUCT AND MATERIAL SAFETY DATA SHEETS AND CONTAINER LABELS FOR SAFE USE, PHYSICAL AND HEALTH HAZARD INFORMATION. THE MATERIAL SAFETY DATA SHEET IS AVAILABLE FROM YOUR DOW CORNING REPRESENTATIVE, OR DISTRIBUTOR, OR BY WRITING TO DOW CORNING CUSTOMER SERVICES, OR BY CALLING (517) 496-6000.
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 Dow Coming's products are safe, effective, and fully satisfactory for the intended end use.
Dow Coming's sole warranty is that the product will meet the Dow Corning 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. Dow Corning specifically disclaims any other express or implied warranty of fitness for a particular purpose or merchantability. Unless Dow Corning provides you with a specific, duly signed endorsement of fitness for use, Dow Corning disclaims liability for any incidental or consequential damages. Suggestions of use shall not be taken as inducements to infringe any patent.