| http://www.w3.org/ns/prov#value | - -pored sintered bodies comprising:mixing vigorously 55% by weight of K2 SO4 powder having grain sizes in the range of 100 to 200 ??m, 45% by weight of borosilicate Duran glass powder type No. 8330 having grain sizes up to and including 20 ??m, and 100 ml of 30% aqueous polyethylene glycol solution per kilogram of the mixture to yield a parent granular material, adding and mixing 10% by weight, rel
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