This specification covers environment resistant@ permanent crimp type@ splices having a heat shrinkable insulating sleeve and meltable environmental seals. They may be used with tin plated and silver plated conductors in applications where the total temperature of the wire insulation does not exceed 150 ?? Classification The splices covered by this specification shall be either of the following Classes as specified (see 6.3): Class 1 - Insulated permanent crimp type splices which conform to all of the requirements of this specification when installed with the crimping tool and heat source shown on the applicable specification sheet. Class 2 - Insulated permanent crimp type splices which conform to the material and marking requirements of this specification@ are replaceable with Class 1 splices@ and conform to the performance requirements of this specification when installed with a crimping tool having crimping dies and motion conforming to the splice manufacturer's control drawing required by 3.6 and the splice manufacturer's recommended heat source (see 6.1.2). Military part number will not be applied to Class 2 splices. Class 2 items shall not be procured@ stocked or issued by the Department of Defense for stock or issue to the Military Services.