Have a power transmission question? Carlisle engineers have the answer. Please send your questions to info@carlislebelts.com Recently Asked Questions: What is the difference between anti-static and static dissipating? These terms mean the same thing. Anti static means that a static charge will not build up on the belts. Static dissipating means that when static starts to build up on the belt, it is able to carry it away. This is done by having portions of the belt made with conductive materials so the belts are able to conduct a small amount of electricity which allows the static to be carried to the pulleys. In order for this to work properly, the pulleys must be metal and there must be an electrical path to ground out the static electricity from the belt. The best way to make sure the pulleys are grounded is to place metal brushes on the shafts of the pulleys because sometimes the grease in the bearings will insulate the pulleys from the ground and allow static to build up. The belt is conductive but must have a place to send the static electricity to prevent a spark. Click here for more information and a list of Carlisle V-Belts that are static dissipating. Our local pulp mill is looking for information on the effect of chemicals on belts. We are running v-belts in lime. Do you offer any products that can be used in this type of environment? Carlisle does not make any special chemical resistant belts. Most Carlisle belts are made of Neoprene and SBR. Neoprene is typically the most resistant to chemical attack. The amount of exposure of the belt to the chemical is a big factor in how long the belt lives. We have a chart that shows chemical compatibilities of Neoprene with various materials. Lime is listed as "Good". We suggest putting a cut piece of the belt into a cup of lime and see if the piece swells or gets soft. For more information click here. Does a BP48 V-Belt mean that it is 48” long? You’d probably expect the outside circumference to be 48 inches. Some part numbers are meaningless and some refer to the belts effective length, outside circumference or inside circumference. Industry standards have been created for belt dimensions. For a BP48, the B stands for a B cross section. A, B, C, and D section belts are called classical belts. The B means that the top width is .66 inches and the thickness is .41. The P on a Carlisle belt means that it is a wrapped molded construction. The 48 is the inside circumference of the belt. The outside length of a BP48 is actually 50.8 inches.