3M secondary liner 4994 is a white 3.2 mil densified kraft liner with a release coating on both sides. This silicone coated DK paper liner features a low release coating on 1-side and medium release on the other for specialized applications. It is engineered for single and double sided tapes in applications requiring rotary die cutting. 3M secondary liner 4994 is a white, 55 lb densified kraft paper liner featuring silicone release coating on both sides. It is excellent for applications requiring both medium and low release: 1-side is medium release while the other delivers low release. This differential liner offers the ability to self-wind double sided tapes. The liner is caliper controlled and designed specifically for rotary die-cutting. The low release coating is ideal for use with 3M high tack acrylic adhesive 300. Recommended applications - differential release applications (low and medium), rotary die-cutting wide web lamination. 3M industrial adhesives and tapes division applies the science of adhesion to deliver innovative solutions that improve the design and manufacturing processes of companies around the world. In the end, these technologies help customers deliver competitive products to the market faster and more efficiently.