eCryo-DOC-0102_-_SHIIVER_MLI_Materials_Specification.docx

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Large Scale Multi-Layer Insulation (MLI) Blankets for Exploration Missions
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NNC16ZLT005R
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SHIIVER MLI Materials Specification

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SHIIVER MLI MATERIALS SPECIFICATION J-2

Multi-Layer Insulation (MLI) Materials Specification

1. Materials specifications.

1.1. Reflective layer materials.

· Each reflective layer shall consist of Mylar, aluminized on both surfaces.

· The room temperature total hemispherical emissivity shall be 0.035 or lower as measured per ASTM 408

· The room temperature resistance shall be less than 1.0 Ohm/square

1.2. Spacer materials and structure.

· The assembled MLI system shall include spacers to keep the reflective layers from touching.

· The spacers shall be double dacron netting

1.3. Cover sheets.

· Coversheets shall be a minimum of 5 mil thick

· Coversheets may include reinforcing scrim/threads

· Coversheets shall be at a minimum aluminized on one side

1.4. Outgassing.

· All materials used shall adhere to NASA low outgassing standards (see Test Standard ASTM E595 and NASA Reference Pub. No. 1124)

1.5. General guidelines for materials selection.

· All materials, especially structural elements such as fasteners and adhesives, shall be compatible with high vacuum and cryogenic temperatures

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