A.10.8. RTV S 691

PRODUCT

Type

Two-part, room-temperature-vulcanising adhesive.

Chemical Composition

Silicone, Filled.

Manufacturer

Wacker-Chemie GmbH

Johannes-Hess-Str. 24,

D-84489 Burghausen

Germany

Tel: +49-86 77-83-20 04

Fax: +49-86 77-83-55 91

Email:

www.wacker.de

EXPERIENCE & AVAILABILITY

Development Status

Special Commercial Product

Cost Range

Very High

Lot Reproducibility

Good

Space Experience

Extensive

GENERAL PROPERTIES (Physical, Mechanical, Thermal, Electrical, Optical)

Nature

Typical Value

Remarks

Pot Life

90 to 110 minutes

Up to 2000 cps viscosity

Initial Viscosity

180 to 260 cps

 

Specific Gravity

1.41 to 1.43

 

Hardness

50 to 60 Shore A

DIN 53505

Tensile Strength

4 to 6 MPa

DIN 53504

Tear Strength

4 to 6 Nmm -1

ASTM D624B

Thermal Expansion Coefficient

200 x 10-6 C -1

400 x 10-6 C -1

T > -105C

T < -105C

Thermal Conductivity

0.39 W m-1 C 1

 

Volume Resistance

1012 W m

DIN 53482 (100V, 1min)

Brittleness Temperature

-105C

 

Shelf Life

12 Months (room temperature)

Manufacturers Data

Glass Transition Temperature

-111C

TMA

PROPERTIES RELEVANT TO SPACE USE

Nature

Typical Value

Type of Test

Temperature Range

-180C to +200C.

 

Outgassing

TML = 0.35%, RML =0.35%, CVCM = 0.07%

ECSS-Q-70-02

Thermal Cycling

Pass

ECSS-Q-70-04

Toxicity/Offgassing

Fails

NASA NHB 8060-1A

Flammability

Burnt

NASA NHB 8060-1B

SPECIAL RECOMMENDATIONS

          Recommended proportions are 90 pbw A to 10 pbw B. Thorough mixing is necessary.

          Cure: 7 days at room temperature.

          Quality control test according to ECSS-Q-70-02 is recommended.

          Use with primer Wacker G 790 for better adhesion

          Offgassing can be reduced to an acceptable level by curing at 65C.