Industry Standards for Passenger Transit, Rail Vehicle Specifications

Composite Panels


Plymetal

Plymetal is typically used for floor panels in the form of 5/8" to 3/4" thickness faced with stainless steel. There are a number of applications where plymetal is also used with melamine faced aluminum such as windscreens or compartment doors.

*The historical specification - MIL-P-8053 - was withdrawn with no replacement. The test criteria however still remains active as an industry standard.


Standard: MIL-P-8053 - Plywood, Metal Faced *
Purpose: This specification covers the manufacture and testing of metal faced plywood materials "Plymetal".
Criteria: Specify compliance with standard MIL-P-8053, Type III (stainless steel)
Usage: ... shall meet the requirements of MIL-P-8053, Type III

Typical Recommended Minimum Shear Values for Metal Bonded to Plywood

Minimum Metal to Wood Test Criteria*
Minimum Value
Dry Shear 250 lbf/in2 (1.72N/mm2) to 80% wood failure
Boil shear, 3 hrs boil, tested at 68°F (20°C) 150 lbf/ in2 (1.03N/mm2) to 80% wood failure
Wet shear, 48 hrs. Soak, 68°F (20°C) 150 lbf/ in2 (1.03N/mm2) to 80% wood failure
Creep, under static load for 48 hrs, 68°F (20°C) 250 lbf/ in2 (1.72N/mm2) to 80% wood failure

* The plymetal test reference also refers to inactive standard MIL-P-8053.