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Insulation
| A combination of thermal and acoustical insulation is provided in passenger
transit rail vehicles, to provide both insulation from the ambient weather,
and provide reduction in ambient noise. The standards cited below provide
minimum material requirements for the insulating materials used. These standards
should be used in conjunction with overall heat transfer and/or noise control
requirements. |
| Standard: |
ASTM C177 - Standard Test Method
for Steady-State Heat Flux Measurements and Thermal Transmission Properties
by Means of the Guarded-Hot-Plate Apparatus
| | Purpose: |
This test method covers the achievement and measurement of steady-state
heat flux through flat-slab specimens using a guarded-hot-plate apparatus.
The method encompasses both the single-sided and the double-sided
mode of measurement.
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| Criteria: |
Specify standard, thermal conductivity
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| Usage: |
...have a thermal conductivity of not greater than 0.25 Btu/hr-ft2-°F/in.
when tested in accordance with ASTM C177.
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| Standard: |
SAE J671 - Vibration Damping
Materials and Underbody Coatings
| | Purpose: |
This standard classifies this mastic type vibration damping materials
used to reduce sound emanating from metal panels. Vibration damping
materials are classified according to nominal decay rate dB/second,
and nominal solids content percent by weight.
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| Criteria: |
Specify standard name, minimum decay rate, and minimum solids
content by weight.
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| Usage: |
SAE J671, 10 dB/s, 65% solids content.
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