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622 Mailable Hazardous Materials | Postal Explorer

622 Mailable Hazardous Materials 622.1 General. As shown in Exhibit 621.1, almost all hazardous materials are prohibited in international mail.Under specific circumstances, only biological substances, limited amounts of radioactive materials, and certain magnetized materials are eligible to be sent in international mail.

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Geopolymer cement - Wikipedia

Geopolymer cement is a binding system that hardens at room temperature, similar to the more widely-known Portland cement.

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