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Technical Data Sheet

RTV60

 

Description

RTV31, RTV60 and RTV88 silicone rubber compounds are high temperature two-part silicone elastomers. They are supplied ready-to-use with a base compound and DBT (dibutyl tin dilaurate) as the standard curing agent. DBT is suitable for most applications, however other catalysts are available to facilitate deep section cure, faster cure and automated mixing.

 

RTV31, RTV60 and RTV88 silicone rubber compounds differ primarily in viscosity in the uncured state.

 

 

 


Key Features and Benefits

  • Variable work times and cure rates by adjusting the amount and type of curing agent
  • Room temperature cure
  • Composition free of solvents and solvent odor
  • Excellent adhesion capabilities with primer
  • Excellent release properties
  • Retention of elastomeric properties at temperatures from -54°C(-65°F) up to 260°C (500°F) continuously, and up to 316°C (600°F) for short periods of time

 


Typical Physical Properties

UNCURED PROPERTIES OF RTV BASE
COMPOUNDS
RTV31RTV60RTV88
Color Red Red Red
Consistency Pourable Pourable

Spreadable

 Paste

Viscosity, cps 25,000 47,000 880,000
Specific Gravity 1.42 1.48 1.47

UNCURED PROPERTIES OF RTV BASE WITH

 0.5% DBT CURING AGENT ADDED

RTV31RTV60RTV88
Work Time @ 25C (77F), hrs 2 2 0.75
Cure Time @ 25C (77F), hrs 24 24 24

CURED PROPERTIES (0.5 wt. % DBT Curing Agent
added, cured 7 days at 25°C (77°F) and 50% R.H.)

RTV31 RTV60 RTV88
Mechanical     
Hardness, Shore A Durometer 54 57 58
Tensile Strength, kg/cm2 (psi) 61 (870) 70 (990) 59 (830)
Elongation, % 170 120 120
Tear Strength, kg/cm (lb/in) 5 (29) 7 (40) 8 (42)
Shrinkage, % 0.6 0.6 0.6
Electrical     
Dielectric Strength, kv/mm (v/mil) (1.9 mm thick) 17 (430) 17.7 (450) 17.4 (440)
Dielectric Constant @ 1000 Hz 4.4 4 4.3
Dissipation Factor @ 1000 Hz 0.03 0.02 0.03
Volume Resistivity, ohm-cm 1.6 x 10144.4 x 10142.8 x 1014
Thermal     
Useful Temperature Range,°C (°F)  -54 to 260-54 to 260-54 to 260
 (-65 to 500)(-65 to 500)(-65 to 500)
Thermal Conductivity (W/m·K)0.310.310.31
Coefficient of Expansion, cm/cm, °C
(in/in, ° F)              

20 x 10-5 

(11 x 10-5)

20 x 10-5 

(11 x 10-5)

20 x 10-5 

(11 x 10-5)

Specific Heat, cal/(gm°C) / (BTU/(lb°F))0.35 / 0.350.35 / 0.350.35 / 0.35

 


Potential Applications

Typical high temperature applications for these products include, but are not limited to:

  • Potting and encapsulating electric motors and transformers
  • Fabrication of rubber parts
  • Casting molds for low-melting point metals
  • Release applications such as rubber rollers
  • Thermal insulation

 

 


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

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

Mixing

Select a mixing container 4 to 5 times larger than the volume of RTV silicone rubber compound to be used. Weigh out the RTV silicone rubber base compound and add the appropriate amount of curing agent. 0.5% DBT by weight will provide a work time or pot life of about one hour and a cure time of 24 hours. 0.5% DBT is the most commonly used concentration of curing agent for RTV31, RTV60 and RTV88 silicone rubber compounds. The pot life may be lengthened by using less DBT (as little as 0.1% DBT).

 

MEASURING GUIDE FOR CURING AGENT ADDITION

RTV WeightDibutyl Tin Dilaurate Concentration
  0.1%0.5%
100 grams 5 drops 25 drops
454 grams (1 lb.) 23 drops 115 drops (2.27 grams)

 

With clean tools, thoroughly mix the RTV base compound and the curing agent, 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 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 25mm (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.

 

Curing

 

Using DBT curing agent at a level of 0.5%, these RTV silicone rubber compounds will cure in 24 hours at 25° C (77° F) and 50% relative humidity to form durable, resilient rubbers. Under these conditions a pot life of about one hour will typically be available for pouring and working with the catalyzed material. Pot life may be increased by refrigerating the mixed material at 0° C (32° F) after catalyzing.

 

A choice of curing agents is available for use with RTV31, RTV60 and RTV88 silicone rubber compounds.

CuringAgentCure SpeedCuring Agent ConcentrationFeatures
DBT moderate 0.1-0.5% standard
STO fast 0.1-0.5% small volume applications
RTV9811 moderate 5-10% good deep section cure suitable for automatic mixing
RTV9950 moderate 5-10% suitable for automatic mixing
RTV9910 slow 10% suitable for automatic mixing

 

Deep Section Cure

 

If these RTV silicone rubber compounds are to be used in deep sections at temperatures over 150°C (302°F), the cured product should be properly conditioned prior to service. Following room temperature cure of 1-3 days, a typical program would be eight hours at 50°C intervals from 100°C (212°F) to the service temperature. Longer times at each temperature will be required for larger parts or very deep sections.

 

Bonding

 

If adhesion is an important application requirement, RTV31, RTV60 and RTV88 silicone rubber compounds require 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 let dry. Then apply a uniform thin film of a suitable silicone primer such as SS4004 silicone primer and allow the primer to air dry for one hour or more. Finally, apply freshly catalyzed RTV silicone rubber compound to the primed surface and cure as recommended.

 

 

 


Limitations

Customers must evaluate Momentive Performance Materials products and make their own determination as to fitness of use in their particular applications.



From automotive to healthcare, from electronics to construction, products from Momentive Performance Materials Inc. are practically everywhere you look. We are a global leader in silicones and advanced materials with a 70+ year heritage of innovation and being first to market – with performance applications that improve everyday life. By knowing our customers’ needs and creating custom technology platforms for them, we provide science based solutions to help customers increase performance, solve product development issues and engineer better manufacturing processes.

Contact Information

For product prices, availability, or order placement, contact our customer service by visiting www.momentive.com/Contacts

 

For literature and technical assistance, visit our website at: www.momentive.com


Momentive and the Momentive logo are trademarks of Momentive Performance Materials Inc.

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 products.

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