OSHA reg 29 CFR 1910.137 gives the requirements for in-service care and use of rubber temporary insulation equipment. This includes gloves and blankets. The daily pre-use inspection for gloves requires an air test to check for pinholes and the air test also helps to identify some other defects. To do the air test, trap air in the glove by sealing the cuffs while the glove is filled out to its regular shape. Just curl the cuffs to trap the air. After some practice this can be done by holding the glove with a hand on each side of the cuff and flipping the gloves to spin the fingers around the cuff. Once air is trapped inside, squeeze the air to the different fingers and areas of the glove body to stretch the material. If there is a pinhole it will enlarge and be very apparent. Also if there are any other deformaties like lacerations or textures changes they will be more easily seen. There are inflators that you could buy, but they seem to not be practical for field use. Do not use your mouth to blow up the glove. The inspection of rubber insulation equipment reads more complicated than it actually is.
[This message has been edited by gpowellpec (edited 01-11-2001).]