Here is the direct, factual breakdown: DIN 30678 is a German standard titled: "Polyethylene coating for steel pipes" (original German: Polyethylen-Umhüllung von Rohrstählen )
I understand you're looking for a regarding DIN 30678 — specifically, access to the PDF or a detailed explanation of the standard. din 30678 pdf
Refurbishment Grading Guide
Cosmetic Grade A
Fully functional with signs of limited usage - Very little wear. Any screens are free of imperfections. Here is the direct, factual breakdown: DIN 30678
Cosmetic Grade B
Fully functional with signs of normal usage - Most commonly small scratches and/or slight dents. Any Screens will have very minor blemishes that will not affect display. Here is the direct
Cosmetic Grade C
Fully functional with signs of considerable usage - most commonly large scratches, dents, chipped/broken plastic, cracks, worn corners, and/or discoloration. Any screens will have noticeable defects.
