INFO:
South African National Standard, SANS 227:2007 for the manufacturing of burnt clay masonry units defines class NFX (NON-FACING EXTRA) as Clay bricks suitable for use, plastered or unplastered, for general building work where durability rather than aesthetics is the key selection criteria: below damp-proof course or under damp conditions or below ground level.
Plaster bricks will vary in colour.
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