Size:Small HARIO uses 100% natural minerals to refine heatproof glass making it an environmentally friendly material. The glass is able to withstand high heat and acid making it suitable for use in microwave ovens. To improve the safety level of heatproof glass 100% natural salt is used to remove bubbles that form in the glass during the manufacturing process. HARIO continues to create heatproof glass that is safe to use and safe for the environment.
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