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 > -105°C T < -105°C
Thermal Conductivity			0.39 W m^-1 °C^–1
Volume Resistance			10^12W m		DIN 53482 (100V, 1min)
Brittleness Temperature			-105°C
Shelf Life			12 Months (room temperature)		Manufacturer’s Data
Glass Transition Temperature			-111°C		TMA
PROPERTIES RELEVANT TO SPACE USE
Nature		Typical Value				Type of Test
Temperature Range		-180°C to +200°C.
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 65°C.