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| PRODUCT DATA of Sheldahl 146401 |
| Material | Sheldahl 146401 |
| General Information | Previously G401500 |
| Product Type | Thermal-control plastic film. |
| Chemical Composition | Fluorocarbon (FEP), Silver and Inconel Coated. |
| Name of Manufacturer | Sheldahl
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 |
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| Development Status | Special Commercial Product |
| Cost Range | High |
| Lot Reproducibility | Good |
| Space Experience | Good |
| PHYSICAL PROPERTIES |
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| Specific Gravity | 2.15 Remark: DuPont’s Data |
| Standard Width | 122 mm Data Quality: Manufacturer's data |
| Thickness | 0.127 mm Data Quality: Manufacturer's data |
| ELECTRICAL PROPERTIES |
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| Electrical surface resistance | 1e16 ohm Remark: ASTM D257-61 |
| Electrical Volume Resistivity | 1e16 ohm.m Remark: ASTM D257-61 |
| Dielectric Strength | 138 kV/mm Remark: (of FEP film) (25°C, 60Hz) DuPont’s Data , -70°C to +70°C |
| THERMAL PROPERTIES |
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| Thermal Conductivity | 0.194 W/m.K Remark: DuPont’s Data , -70°C to +70°C |
| Thermal Expansion Coefficient | 83 μstrain/°C Remark: DuPont’s Data , -70°C to +70°C |
| Specific Heat | 1.17 J/g.K Remark: DuPont’s Data , -70°C to +70°C |
| OPTICAL PROPERTIES |
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| Thermal Emittance | 0.78 Test: ECSS-Q-70-09 |
| Solar Absorbtance | 0.08 Test: ECSS-Q-70-09 |
| RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY |
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| Toxicity/Offgassing | Pass 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 Index | 95 Test: ECSS-Q-70-21 |
| Moisture Absorption | < 0.01% Test: DuPont’s Data |
| SPECIAL RECOMMENDATIONS |
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| Special Recommendations | There 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%. |