The graphene stone box is placed in the cold storage, frozen for 3-4 months, the more frozen the tougher, the anti-freeze and frost resistance are high, and the box can be directly put into the cold storage at -70 °C.
Eco-friendly board - gray
Eco-friendly board - blue
Eco-friendly board - dark gray
Eco-friendly board - yellow
Protect from light
Step 1: Raw material extraction
Step 2: Grind into calcium carbonate splits
Step 3: Add graphene and other materials
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