1.1 This test method is used to determine the force required to cause a sharp-edged puncture probe (hypodermic needle) to penetrate through protective clothing material. The standard describes three test probes that may be used: 21-, 25-, o This test method is used for determining the force required to cause a hypodermic needle to penetrate through protective clothing material. It defines three common hypodermic needles - 21-, 25-, 28- gauge needles - to evaluate puncture resistance of pr