mid-15c., from drip (v.). The slang meaning stupid, feeble, or dull person is first recorded 1932, perhaps from earlier American English slang sense nonsense (1919).
Time at heat and temperature are critical in the hardening transformation phase. Rapid cooling and tempering complete the process. Quench and Temper provides strength and uniformity of hardness through the entire part from the surface to the core. This is achieved by heating the entire part up above the transformation temperature for a set period of time. Upon quenching, parts must be tempered to the desired hardness creating a Tempered Martensitic Microstructure. Medium Carbon Steels (.25-.70C) are commonly Quench and Tempered. During this quenching process, parts are cooled rapidly thereby locking in the microstructure transformation. Oil is a very common quench medium for this process.
Cooled rapidly, glass tempers. Slower cooling produces heat-strengthened glass. 4. Tempered is stronger. Tempered glass has a minimum surface compression of 10,000 pounds-per-square-inch (psi) and minimum edge compression of 9,700 psi, according to ASTM C1048. That makes it about four times stronger than annealed glass. Heat-strengthened glass has surface compression of 3,500 to 7,500 psi, about twice as strong as annealed glass, with no edge compression standard. 5. Tempered glass is safety glass.