National Gypsum Properties LLC is a full-service independent testing facility that specializes in full-scale fire, acoustical and structural testing services. Its acoustical testing capabilities include partition sound transmission loss chambers, ceiling attenuation chambers, sound absorption/ transmission chambers, floor-ceiling and hemi-anechoic testing, along with analytical testing. The firm also offers a variety of horizontal/vertical wall/vertical tube furnaces for its fire testing services, in addition to structural and physical testing. It is an ISO/IEC 17025 certified company. It is also an National Voluntary Laboratory Accreditation Program (NLAP) accredited company.