DOWSIL 733 | Krayden

Main features

Non-Slumping Vertical/Overhead Application
Primerless Glass, Metal, and Plastic Adhesion
-57 to 177 deg C Flexibility

Product Description

DOWSIL™ 733 Glass & Metal Sealant is a one-part, acetoxy-cure silicone rubber supplied as a nonslumping paste for OEM bonding and sealing. It adheres without primer to many properly cleaned glass, metal and plastic substrates and cures at room temperature through exposure to atmospheric moisture. Applications include appliances, heavy equipment, marine equipment and recreational vehicles.

Key features

Nonslumping consistency: Supports application on vertical, sidewall and overhead surfaces without sagging or running.
Unprimed adhesion: Adheres to many properly cleaned glass, metal and plastic substrates without primer.
Broad flexibility range: Remains flexible from -57 to 177°C, with intermittent exposure to 204°C.

Applications

OEM bonding and sealing for appliances, heavy equipment, marine equipment and recreational vehicles.

TDS, SDS & Technical Documents

Technical Specifications

General Properties

Color

Clear, white, black and aluminum

Specific Gravity

1.03

Physical Properties

Tack-Free Time

15 minutes

Mechanical Properties

Elongation

500 %

Additional Information

Industrial silicone sealant

DOWSIL™ 733 Glass & Metal Sealant

A one-part, acetoxy-cure silicone rubber for OEM bonding and sealing. The ready-to-use nonslumping paste adheres without primer to many properly cleaned glass, metal and plastic substrates and cures through exposure to atmospheric moisture to form a tough, flexible rubber.

One-part silicone Acetoxy moisture cure Nonslumping paste Primerless adhesion Flexible after cure

DOWSIL 733 Glass and Metal Sealant in its commercial product packaging

DOWSIL™ 733 Glass & Metal Sealant; packaging and available color may vary.

Uncured material

As-supplied properties

Typical values are not intended for use in preparing specifications.

Property	Value	Unit	Method / condition
Standard colors	Clear, white, black and aluminum	—	Standard commercial colors
Specific gravity	1.03	—	At 25°C
Extrusion rate	350	g/min	3.18 mm orifice; 90 psi air pressure
Flow rate — sag or slump	Nil	mm	3.18 × 101.6 mm bead
Tack-free time	15	minutes	25°C and 50% relative humidity
Cure time	24	hours	3.18 mm thickness at 25°C and 50% relative humidity
Shelf life	900	days	Store in the original unopened container at or below 32°C

Processing

Application and cure

DOWSIL™ 733 is supplied ready to use and extrudes directly from its container. Apply it to properly prepared surfaces in a uniform thickness, complete tooling before the tack-free skin forms and allow the assembly to remain undisturbed at room temperature during cure.

Surface preparation: Thoroughly clean and degrease applicable metal and plastic surfaces with a suitable solvent. Roughen rubber surfaces with sandpaper, then wipe with acetone.

Application and tooling: Force the sealant into the joint or seam to obtain full surface contact. Tool within approximately 5 to 10 minutes and remove masking tape before a tack-free skin forms.

Cure conditions: A tack-free skin forms in approximately 10 to 15 minutes at 25°C and 50% relative humidity. Sections up to 3.18 mm thick become rubbery solids in about 24 hours under these conditions.

DOWSIL 733 sealant being dispensed and tooled into a properly prepared industrial joint

Apply a uniform bead to properly prepared surfaces and complete tooling before skin formation.

Storage and handling

Store the product in its original unopened container at or below 32°C. Cure progresses inward from surfaces exposed to atmospheric moisture. Lower humidity, greater section thickness and confinement extend cure time; complete cure may not occur under absolute confinement. Follow the applicable solvent label and current safety documentation when preparing surfaces and handling the product.

Cured silicone rubber

Cured properties

Typical values are not intended for use in preparing specifications. Cure conditions and test context are shown with each property.

Property	Typical value	Unit or condition
Durometer hardness	25	Shore A; ASTM D2240; cured 3 days at 25°C and 50% RH
Tensile strength	2.3 (335)	MPa (psi); ASTM D412, Die C; cured 3 days
Elongation	500	%; ASTM D412, Die C; cured 3 days
180° peel strength — stainless steel	20	pli; cured 2 days at 25°C and 50% RH
180° peel strength — matte-finish steel	20	pli; cured 2 days at 25°C and 50% RH
180° peel strength — aluminum	21	pli; cured 2 days at 25°C and 50% RH
Sustained flexibility range	-57 to 177	°C; intermittent exposure to 204°C

Supported use contexts

Applications

DOWSIL™ 733 is used for OEM bonding and sealing in industrial and transportation-related equipment assemblies.

Appliance assembly containing a bonded or sealed glass-to-metal interface

Appliance assemblies

Used for OEM bonding and sealing of appliance components, including properly prepared glass, metal and plastic interfaces.

Heavy equipment

Used in heavy-equipment bonding and sealing applications requiring a nonslumping, flexible silicone rubber.

Marine or recreational vehicle panel and window interface prepared for silicone sealing

Marine and recreational vehicle equipment

Used for OEM bonding and sealing in marine equipment and recreational vehicle assemblies exposed to vibration, moisture and weather.

Product resources

DOWSIL™ Silicone Sealants and Foams for Industrial, Appliance and Maintenance

A selection guide covering Dow silicone-sealant chemistries, product options, typical properties and industrial, appliance and maintenance applications.

View resource

Certified Solutions for Food and Beverage Processing

An application-focused guide to Dow material solutions and certification considerations for equipment used in food-and-beverage processing environments.