CUSTOMIZABLE BONGS
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4:20 related stuff

Duran glass

DURAN® is a special borosilicate glass of the first hydrolytic class. Its invention was one of Otto Schotts great achievements. Laboratory and chemical plant technology would be unthinkable without DURAN tubing, capillary and rod, which provide the basis for custom-made solutions to specific problems.

Properties of Duran are very similar to properties of Pyrex and Simax.

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