The product ID codes for Dyneema Composite Fabric represent a short-hand way of denoting material content. For example, how the relative amounts of Dyneema fiber and thickness of mylar.
Here is an example breakdown for CT2K.18 - 1.0 oz Dyneema Composite Fabric:
Higher numbers represent increased % fiber content or mylar film thickness. Mylar film type is indicated by letter e.g. "K", "E", etc.
For certain variants, there could be additional numbers/letters inside the product IDs to indicate things such as color, woven face fabric type, experimental lots, etc.