Some quarries have hard rock that tests at 35,000 to 45,000 psi. Rock pushing 45,000 psi or more certainly is hard. And as for 80,000 psi rock-that's hard redefined. Very few quarries can boast having rock that has an unconfined compression test result of 80,000 psi, but Dresser (Wis.) Trap Rock Inc. can. Maybe boast is not the best word to describe a rock that is this hard, for it brings before the company a unique set of challenges not experienced by most others in the rock crushing-screening business. Nonetheless, while this trap rock is difficult to mine, crush and screen, it has attributes that make it a highly desirable rock for producing quality aggregates, construction applications and decorative uses.
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机译：一些采石场的硬岩测试压力为35,000至45,000 psi。推力达到45,000 psi或更高肯定是困难的。至于80,000 psi的岩石，很难重新定义。很少有采石场能吹嘘其岩石的无限制压缩测试结果为80,000 psi，但德莱瑟（威斯康星州）Trap Rock Inc.可以。也许夸口不是形容这种坚硬岩石的最佳词汇，因为它给公司带来了岩石破碎筛分行业中大多数其他人都没有经历过的独特挑战。尽管如此，尽管这种捕集岩难以开采，压碎和筛分，但它的特性使其成为生产优质骨料，建筑应用和装饰用途的高度理想的岩石。
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