QPL (Qualified Products List) is a term that means the entity in question is accepted by the government to manufacture material in accordance with a specification. If you are selling under the government specification, you must be on the QPL. The Defense Supply Center Columbus (now referred to as the DLA [Defense Logistics Agency]) has a test process to ensure conformance and continued conformance with a specification. There must be a quality system in place to ensure continued performance in accordance with the specification.
NEDC is approved to manufacture and convert MIL-DTL-83528 types A, B, C, D, F, G, K, L, and M. This is significant because NEDC cannot only manufacture MIL-DTL-83528 materials to the military specification, but NEDC can also convert (die cut, water jet cut, and fabricate) these materials.