I. Nkyekyɛm a ɛfa ogyaframa a ɛmma ogya ntumi nhyew ho:
ZR: Ɛkyerɛ sɛ ogyaframa no ntumi nkɔ mu. Sɛ yɛbɛka no ɔkwan biara so a, sɛ biribi titiriw biara nni hɔ a, ZR ne nea ɛba fam koraa wɔ ogyaframa a ɛmma ogya ntumi nhyew mu.
ZA, ZB, ZC, ZD: "Z" a ɛwɔ saa nkyerɛwde ahorow a wɔaka abom yi mu no gyina hɔ ma ogyaframa a ɛmma ogya ntumi nhyew, na nkyerɛwde a edidi so yi kyerɛ ogya a ɛrehyew pɔtee no grade. Wɔn mu no, A yɛ nea ɛkorɔn sen biara.
D yɛ level a ɛba fam koraa.
ii. Nneɛma a ɛma ogya ntumi nhyew:
ZA: Ɛwɔ adwumayɛ a ɛkorɔn sen biara a ogya ntumi nhyew, a ɛkyerɛ sɛ waya no betumi asiw ogyaframa a ɛretrɛw wɔ ogya tebea mu no ano yiye.
ZB: Ne flame retardant performance no yɛ nea ɛto so abien wɔ ZA grade no akyi, ɛba fam kakra.
ZC: Agyapadeɛ a ɛmma ogya ntumi nhyew no yɛ deɛ ɛtɔ so mmienu, na ɛyɛ ogya a ɛntumi nhyew a ɛtaa ba.
