MIL-P-22241, Type II, Grade B, 12"x12" Sheet, .125" (1/8") Thick

MIL-P-22241 - Plastic Sheet (and film) Polytetrafluoroethylene (PTFE-Fluorocarbon Resin)

Type II - Skived sheet (usually called skived tape), 0.001 to 0.300 inches thick inclusive.
Grade B—General Purpose

Dimensions

Size - 12"x12" (Tolerance -0/+.25")
Thickness - .0125" (1/8") (Tolerance ±0.0005)

Mechanical Properties

Tensile Strength - MPa - 19.31 - psi - 2800

Elongation Min % - 200

Specific Gravity - 2.14-2.19