Industry Standards for Passenger Transit, Rail Vehicle Specifications

Materials & Workmanship


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.
Criteria: Specify standard, thermal conductivity
Usage: ...have a thermal conductivity of not greater than 0.25 Btu/hr-ft2-°F/in. when tested in accordance with ASTM C177.
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.
Criteria: Specify standard name, minimum decay rate, and minimum solids content by weight.
Usage: SAE J671, 10 dB/s, 65% solids content.