⑥ micro-expansion melt adhesive ─ finger pressure is not broken, both in the upper and lower surfaces cinder silver-white metallic luster, but the coke residue on the surface, with a smaller expansion foam (or small bubbles).
⑦ expansion melt adhesive ─ cinder upper and lower surfaces of silver-white metallic luster, obvious swelling, but no higher than 15mm.
⑧ strong expansion of the upper and lower melt adhesive ─ cinder surface silver-white metallic luster, cinder height greater than 15mm. Typically the sake of simplicity, the above numbers can be used as a variety of features cinder code.
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