Electrical-insulating rubber gloves meet ASTM D120 specifications and NFPA 70E standards to protect workers from electrical hazards. They are made of dielectric natural rubber to protect workers from electrical shock when working near electrical hazards. Electrical-insulating rubber gloves are categorized by voltage class (Class) and whether or not the glove is resistant to ozone (Type). Voltage class describes the maximum voltage the glove can be used with. Workers should use a voltage class rating that matches the requirements set by their work site. Type I electrical-insulating gloves are not ozone-resistant. Type II electrical-insulating gloves resist cracking and degradation caused by exposure to high levels of ozone that can be found in high-pollution areas.