См.: буфер сырья.
raw material bufferraw material buffer - - A stock of raw materials that provides instant availability to a gateway process. These buffers are usually used for material with long lead time and with high enough demand to warrant stocking.
Usage: In some instances lead time to get raw materials is too long to react to market demand. In these instances a raw material buffer can be held at or near the plant to ensure that key materials and/or long lead time raw materials are available when needed.