QPQ ASTM B117 Comparison Chart
QPQ may refer to: * Quid pro quo, Latin phrase meaning something for something * Quench polish quench Quench polish quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer or Melonite. Three steps are involved: nitrocarburize ("quench"), ...

Quid Pro Quo
Quid pro quo ('what for what' in Latin) is a Latin phrase used in English to mean an exchange of goods or services, in which one transfer is contingent upon the other; "a favor for a favor". Phrases with similar meanings include: "give and take", "tit for tat", "you scratch my back, and I'll scratch yours", and "one hand washes the other". Other languages use other phrases for the same purpose. Origins The Latin phrase ''quid pro quo'' originally implied that something had been substituted, as in ''this instead of that''. Early usage by English speakers followed the original Latin meaning, with occurrences in the 1530s where the term referred to substituting one medicine for another, whether unintentionally or fraudulently. By the end of the same century, ''quid pro quo'' evolved into a more current use to describe equivalent exchanges. In 1654, the expression ''quid pro quo'' was used to generally refer to something done for personal gain or with the expectation of reciprocity ...
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