This specification covers the general requirements, property and performance requirements, quality, qualification, source approval, and quality control for six weights of polymeric sheet materials that can be used as a sound deadener coupled with an underlayment of foam or shoddy. The type of underlayment is to be specified in an appropriate specification. Other applications may include vibration dampers for treatment of vehicle substrate material.

Type I: minimum weight is 2.44 kg/m² or 0.50 Lb/ft²

Type II: minimum weight is 3.90 kg/m² or 0.80 Lb/ft²

Type III: minimum weight is 4.88 kg/m² or 1.00 Lb/ft²

Type IV: minimum weight is 6.10 kg/m² or 1.25 Lb/ft²

Type V: minimum weight is 7.81 kg/m² or 1.60 Lb/ft²

Type VI: minimum weight is 1.7 kg/m² or 0.35 Lb/ft²

Type VII: minimum weight is 1.2 kg/m² or 0.25 Lb/ft² (Door water shield applications)

Type VIII: minimum density of 1600 kg/m3. Parts must be a minimum of 3 mm thick. Exceptions will be made down to 1 mm minimum thickness where the material must accommodate isolated geometric restraints.

Type I, II, III, IV, V, VI, or VIII Sound Deadeners will be further divided into Grade A, B, C, D, E, F or G dependent on Property and Performance values listed in Section 4.2.

Note: If Grade is not specified, then Grade A shall apply.

Restricted Chemical Substances

All product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification.