Technical Data Sheet
Description
RTV630 blue two component silicone rubber compound cures at room temperature to a high strength silicone rubber. This product is supplied in a
matched kit of base (A) component and curing agent (B) component which is designed for use at a convenient 10:1 ratio by weight.
The viscosity of the catalyzed compound is a moderately pourable 150,000 cps.
RTV630 silicone rubber compound is a medium viscosity product which will form thin, light-weight molds with excellent durability. The high tear resistance
and inherent release ability of RTV630 rubber compound make it well suited to the manufacture of intricate castings, by reproducing each part exactly to
detail.
Other typical applications for RTV630 silicone rubber compound include prototype parts, production tools for casting epoxies and rubber rolls. Electrical
circuits requiring a tough potting compound with outstanding vibration withstanding capability find RTV630 unequalled.
Key Features and Benefits
■
Convenient 10:1 mixing ratio for use in automatic dispensing equipment or hand operation
■Good self-leveling characteristics allow precision reproduction of fine model details
■Free of solvents
■Long working time at room temperature permits potting or reproduction of larger parts
■Cure rate can be accelerated with heat
■May be cured in deep sections
■May be cured in closed assemblies
■No cure by-products
■Low shrinkage
Typical Physical Properties
UNCURED PROPERTIES
RTV630A
RTV630B
Color
Beige
Blue
Consistency
Pourable
Easily Pourable
Viscosity, cps
160,000
6,000
Specific Gravity
1.29
1.07
UNCURED PROPERTIES
WITH CURING AGENT ADDED
RTV630
Color
Blue
Consistency
Pourable
Viscosity, cps
150,000
Specific Gravity
1.28
Work Time @ 25°C (77°F), hrs
4
CURED PROPERTIES
(Cured 1 hr. @ 100ºC/212º
F)
RTV630
Mechanical
Hardness, Shore A, Durometer
60
Tensile Strength, kg/cm
2 (psi)
58 (820)
RTV630
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Patent Status
Nothing contained herein shall be construed to imply the nonexistence of any relevant patents or to constitute a permission, inducement or
recommendation to practice any invention covered by any patent, without authority from the owner of the patent.
Product Safety, Handling and Storage
When solvents are used, proper safety precautions must be observed. All solvents must be considered toxic and must be used only in well ventilated
areas. Exposure to high vapor concentrations must be avoided. When flammable solvents are used, storage, mixing and use must be in areas away from
heat, sparks, flame or other sources of ignition
Caution:
RTV630B curing agent can generate flammable hydrogen gas upon contact with acidic, basic or oxidizing materials. Such contact should be avoided.
Customers should review the latest Material Safety Data Sheet (MSDS) and label for product safety information, safe handling instructions, personal
protective equipment if necessary, and any special storage conditions required for safety. MSDS are available at www.momentive.com or, upon
request, from any Momentive Performance Materials (MPM) representative.
For product storage and handling procedures to maintain the
product quality within our stated specifications, please review Certificates of Analysis, which are available in the Order Center. Use of
other materials in conjunction with MPM products (for example, primers) may require additional precautions. Please review and follow the safety
information provided by the manufacturer of such other materials.
Processing Recommendations
Compatibility
RTV630 silicone rubber compound will cure in contact with most clean dry surfaces. However, certain materials, such as butyl and chlorinated rubber,
sulfur-
containing materials, amines, and certain metal soap
-cured RTV silicone rubber compounds, can cause cure inhibition. Cure inhibition is
characterized by a gummy appearance of the RTV silicone at the interface of the silicone rubber compound and the substrate.
It is recommended that a sample patch test be performed with RTV630 rubber compound to determine if a barrier coating or other inhibition-preventing
measures are necessary before pouring the material.
Mixing
Select a mixing container 4
-5 times larger than the volume of RTV silicone rubber compound to be used. Weigh out ten parts of the A component and one
part of the B component. Since RTV630 silicone rubber compound is kit-matched, work time (or pot life), cure time, and final properties of the cured RTV
silicone rubber compound can be assured only if the A component is used with the B component from the same kit.
With clean tools, thoroughly mix the A and B components together, scraping the sides and bottom of the container carefully to produce a homogeneous
mixture. When using power mixers, avoid excessive speeds which could entrap large amounts of air or cause overheating of the mixture, resulting in
Elongation, %
250
Tear Strength, kg/cm (lb/in)
20 (110)
Shrinkage, %
0.8
Electrical
Dielectric Strength, kv/mm (v/mil)
(1.9 mm thick)
17.7 (450)
Dielectric Constant @ 1000 Hz
3.2
Dissipation Factor @ 1000 Hz
0.006
Volume Resistivity, ohm
-
cm
4.5 x 1015
Thermal
Useful Temperature Range,°C (°F)
-60 to 204(-75 to 400)
Thermal Conductivity, gm
-cal/sec, hr,
cm
2
, °C/cm
(W/M K)
0.00074 (0.31)
Thermal Conductivity Btu
-hr, ft2, °F/ft
(0.18)
Coefficient of Expansion, cm/cm, °C
(in/in, °F)
21.0 x 10-5(11.4 x 10-5)
Specific Heat, cal/gm, °C
(Btu/lb, °F)
0.35(0.35)
RTV630
Page 2 of 3HCD-10339 (Rev. 2/15/2013 6:33:42 PM)
shorter pot life.
Deaeration
Air entrapped during mixing should be removed to eliminate voids in the cured product. Expose the mixed material to a vacuum of about 25 mm (29 in.) of
mercury. The material will expand, crest, and recede to about the original level as the bubbles break. Degassing is usually complete about two minutes
after frothing ceases. When using the RTV silicone rubber compound for potting, a deaeration step may be necessary after pouring to avoid capturing air
in complex assemblies.
Automatic equipment designed to meter, mix, deaerate, and dispense two-component RTV silicone rubber compounds will add convenience to continuous
or large volume operations.
Curing
RTV630 silicone rubber compound will cure sufficiently in 24 hours at 25º
C (77
º
F) to permit handling. To achieve optimum properties an elevated
temperature cure or a cure time of two days at room temperature is required. The table below illustrates the effect of temperature on cure time:
* Cure times are only approximate. The actual time is affected by the mass of the unit and the time required to reach the desired temperature.
Bonding
RTV630 silicone rubber compound requires a primer to bond to non-silicone surfaces. Thoroughly clean the substrate with a non-oily solvent such as
naphtha or methyl ethyl ketone (MEK), and allow to dry. Then apply a uniform thin film of SS4155 silicone primer, and allow the primer to air dry for one
hour or more. Finally, apply freshly catalyzed RTV630 silicone rubber compound to the primed surface and cure as recommeed.
Limitations
Customers must evaluate Momentive Performance Materials products and make their own determination as to fitness of use in their particular
applications.
Cure Time*
7 days
4 hrs.
1 hr.
15 min.
Contact Information
For product prices, availability, or order placement, contact our customer service by visiting
momentive.com/ContactSilicones
.
For literature and technical assistance, visit our website at: www.momentive.com
DISCLAIMER
The information provided herein was believed by Momentive Performance Materials Inc. (collectively with its subsidiaries, “
Momentive
”) to be accurate at
the time of preparation or prepared from sources believed to be reliable, but it is the responsibility of the user to investigate and understand other
pertinent sources of information, to comply with all laws and procedures applicable to the safe handling and use of the product, and to determine the
suitability of the product for user's intended application or use. All products supplied by Momentive are subject to Momentive
’
s standard terms and
conditions of sale.
MOMENTIVE MAKES NO WARRANTY, EXPRESS OR IMPLIED, CONCERNING THE PRODUCT OR THE MERCHANTABILITY OR
FITNESS THEREOF FOR ANY PURPOSE OR CONCERNING THE ACCURACY OF ANY INFORMATION PROVIDED BY MOMENTIVE
, except that the
product shall conform to Momentive
’
s specifications. Nothing contained herein constitutes an offer for the sale of any product.
Momentive and the Momentive logo are trademarks of Momentive Performance Materials Inc.
RTV630
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