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PRODUCT DATA of Sheldahl 146631
MaterialSheldahl 146631
General InformationPreviously G425120
Product TypeThermal-control, electrically-conductive plastic film.
Chemical CompositionPolyimide (Kapton H), ITO/Aluminised.
Name of ManufacturerSheldahl
sheldahl.info@sheldahl.com
www.sheldahl.com
150 Sheldahl Rd., Northfield, MN 55057, USA
+1 507 663 8000
+1 507 663 8545
EXPERIENCE IN PRACTICE
Development StatusSpecial Commercial Product
Cost RangeHigh
Lot ReproducibilityUnknown
Space ExperienceLimited
PHYSICAL PROPERTIES
Specific Gravity1.42
Remark:DuPont’s Data
Standard Width122 mm
Data Quality: Manufacturer's data
Thickness0.025 mm
Data Quality: Manufacturer's data
ELECTRICAL PROPERTIES
Electrical surface resistance200000 ohm-sq @ 1V
THERMAL PROPERTIES
Thermal Conductivity0.155 W/m.K
Remark: DuPont’s Data
Thermal Expansion Coefficient20 μstrain/°C
Remark: DuPont’s Data
Specific Heat1.09 J/g.K
Remark: DuPont’s Data
OPTICAL PROPERTIES
Thermal Emittance0.61
Test: ECSS-Q-70-09
Solar Absorbtance0.35
Test: ECSS-Q-70-09
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Temperature Range(space)-250 to +285°C
Data Quality: Manufacturer's data (continuous exposure)
SPECIAL RECOMMENDATIONS
Special RecommendationsThere exist other thicknesses of the same material: 12.5microns to 127microns. · 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.