The Rubber Industry has a long history going back several hundred years and during its development the terminology used has not always been the most logical or descriptive. For example, Hancock described his masticator and mixing device as a 'Pickle' to avoid conveying any knowledge of what it did or how it worked. As it carries the baggage of this considerable period of time, some new to the industry find it difficult to understand. With terms such as spew, mould dope, pig, drug room and cracking all having their own rubber-related meaning, it is little wonder that the industry is regarded by outsiders as a Black Art. The Rubber Pocket Book comprises a glossary of terms used in the rubber industry, including the common rubber materials, additives, testing, analysis, compounding and terms used in rubber processing. It is simple enough to be understood by someone with a basic knowledge of the industry, but comprehensive enough to provide additional information for experienced workers moving into new areas. A useful short section lists the specific gravities of common rubbers and compounding ingredients, an important factor in material selection. It also includes instructions on how to calculate compound specific gravity and specific volume, essential in loading mixers of defined volume. Many abbreviations are used in the rubber industry and a comprehensive list is included in the glossary, which is arranged alphabetically. Each entry consists of the term or abbreviation followed by an expanded definition.