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PRODUCT DATA of Sheldahl 146401
MaterialSheldahl 146401
General InformationPreviously G401500
Product TypeThermal-control plastic film.
Chemical CompositionFluorocarbon (FEP), Silver and Inconel Coated.
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 ReproducibilityGood
Space ExperienceGood
PHYSICAL PROPERTIES
Specific Gravity2.15
Remark: DuPont’s Data
Standard Width122 mm
Data Quality: Manufacturer's data
Thickness0.127 mm
Data Quality: Manufacturer's data
ELECTRICAL PROPERTIES
Electrical surface resistance1e16 ohm
Remark: ASTM D257-61
Electrical Volume Resistivity1e16 ohm.m
Remark: ASTM D257-61
Dielectric Strength138 kV/mm
Remark: (of FEP film) (25°C, 60Hz) DuPont’s Data , -70°C to +70°C
THERMAL PROPERTIES
Thermal Conductivity0.194 W/m.K
Remark: DuPont’s Data , -70°C to +70°C
Thermal Expansion Coefficient83 μstrain/°C
Remark: DuPont’s Data , -70°C to +70°C
Specific Heat1.17 J/g.K
Remark: DuPont’s Data , -70°C to +70°C
OPTICAL PROPERTIES
Thermal Emittance0.78
Test: ECSS-Q-70-09
Solar Absorbtance0.08
Test: ECSS-Q-70-09
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Toxicity/OffgassingPass
Test: NASA NHB 8060-1A
Temperature Range(space)-185 to +150°C
Test: Long term
Outgassing(Avg data)RML = 0.05%, CVCM = 0.01%
Test: ECSS-Q-70-02
Oxygen Index95
Test: ECSS-Q-70-21
Moisture Absorption< 0.01%
Test: DuPont’s Data
SPECIAL RECOMMENDATIONS
Special RecommendationsThere exist thinner films of the same material: 50micron 146374, 25micron 146400, 251micron 146435 (G404000) and also thicker. Other widths than standard can be obtained. · There exist similar films with incorporated adhesive, either acrylic pressure sensitive, suitable for space, or silicones of which the suitability is doubtful. It is anyway preferable to fasten the film on a separately applied double-sided adhesive tape in order to avoid crazing in the metal layer due to the peeling off of the liner. · The nomenclature of the Sheldahl company can be confusing and identification of films must be known very precisely for each type used. · Depending on the adhesive used, Sheldahl silvered FEP may be damaged by thermal cycling according to ECSS-Q-70-04. · Perforated versions of the film are available. · Protective coverlay is available. · Electrically conductive versions are also made by Sheldahl (front layer ITO deposit). However, conductivity is not maintained during wide temperature band of thermal cycling and ITO layer is degraded by long-term exposure to RH > 60%.