Oge nkwụsị ọkụ nke klas A nchara ọkụ ọnụ ụzọ adịghị ihe na-erughị 1.5 awa, na nke a chọrọ nwere ike na-akpọ klas A ọkụ ọnụ ụzọ. Klas A ọkụ ime ụlọ n’ozuzu na-eji perlite, obere ego nke refractory ihe dị ka vermiculite ọkụ osisi, ụfụfụ ọnụ ụzọ isi efere, MC compliant ihe, wdg.

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