A.17.18. Sheldahl 146631 (previously G425120)
PRODUCT
Type			Thermal-control, electrically-conductive plastic film.
Chemical Composition			Polyimide (Kapton H), ITO/Aluminised.
Manufacturer	Sheldahl 1150 Sheldahl Rd. Northfield, MN 55057 USA					Tel: +1 507 663 8000 Fax: +1 507 663 8545 Email: sheldahl.info@sheldahl.com www.sheldahl.com
EXPERIENCE & AVAILABILITY
Development Status			Special Commercial Product
Cost Range			High
Lot Reproducibility			Unknown
Space Experience			Limited
GENERAL PROPERTIES (Physical, Mechanical, Thermal, Electrical, Optical)
Nature			Typical Value				Remarks
Specific Gravity				1.42			DuPont’s Data
Thickness				25 mm			Manufacturer’s Data
Tensile Strength				170 MPa			DuPont’s Data
Thermal Expansion Coefficient				20 x 10^-6 °C^-1			DuPont’s Data
Thermal Conductivity				0.155 W m^-1 °C^-1			DuPont’s Data
Specific Heat				1.09 J g^-1 °C^-1			DuPont’s Data
Surface Resistivity				200 kW £			@ 1V
Solar Absorbtance				0.35			ECSS-Q-70-09
Thermal Emittance				0.61			ECSS-Q-70-09
Standard Width				122 cm			Manufacturer’s Data
PROPERTIES RELEVANT TO SPACE USE
Nature		Typical Value			Type of Test
Temperature Range		-250 to +285°C			Manufacturer’s Data (continuous exposure)
SPECIAL RECOMMENDATIONS
· There exist other thicknesses of the same material: 12.5mm to 127mm. · Normal use is as external sheet of multilayer insulation. Suitable venting must be provided. · The nomenclature of the Sheldahl company can be confusing and identification of films must be known very precisely for each type used. · Front-face ITO layer is degraded by long-term exposure to RH > 60%. · The ITO layer protects the film from atomic oxygen etching if not damaged. · The ITO layer is stabilised against handling damage by a thermal treatment in air at 250°C.