Sɛnea China "Classification of Combustion Performance of Building Materials and Products" (GB 8624-2012) kyerɛ no, Class A nneɛma no ntumi nhyew. Ogya rating a backing board no gyina nneɛma no so:
- Class A akyi board: gypsum board, glass magnesium board, rock wool board, ne nea ɛkeka ho, a wɔasɔ ahwɛ na wɔagye atom sɛ Class A1 (ɛnyɛ-nhyew) anaa Class A2 (wusiw a ɛba fam-wusiw, ɛnyɛ-nhyew). Sɛ nhwɛso no, ahwehwɛ magnesium akyi kyerɛwpon bi a wɔasɔ ahwɛ sɛ Class A1 (nsɛm a wɔde kyerɛw: National Fireproof Building Materials Quality Supervision and Inspection Center amanneɛbɔ).
- Nea ɛnyɛ-Klas A akyi board: Density fiberboard ne plywood a ɛyɛ daa no taa yɛ Class B2 (ɛtumi hyew) anaa Class B1 (ɛyɛ den sɛ wɔbɛhyew), a ɛhwehwɛ sɛ wɔde ogyaframa a ɛmma ogya ntumi nhyew ka ho na ama rating no atu mpɔn.
