hard water

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hard water

[′härd ¦wȯd·ər]
(chemistry)
Water that contains certain salts, such as those of calcium or magnesium, which form insoluble deposits in boilers and form precipitates with soap.

hard water

Water containing solutions of mineral salts (sulfates of calcium and magnesium, carbonates, and bicarbonates). Also see water softener.
References in periodicals archive ?
A mold strength tester can be used in much the same manner as a hardness tester, but it can be more definitive on harder molds (more than 92 mold hardness) than the C hardness tester.
Another principle for portable hardness testers is the rebound method.
Structure of hardness tester consists in a sonde, an electrical connection cable and an electronic unit, figure 1, in turn probe, figure 2, consists of a cylindrical body 1, provided with a rubber sleeve 2, an indenter 3 which acts on tested material 4, a portindenter 5, a loading rod 6, a mounting base 7, a guide bush 8, a mounting spring 9, a guide bush with balls 10, a preloading spring 11, a contact rod 12, a tensioning nut 13, a torque cell with resistive sensors 14, electrical connector 22 and an electronic unit.
The third series of the company's IRHD hardness tester line is said to have more convenient and user-friendly operation.
Experimental measurements were performed by an automatic Martens hardness tester produced by Schimadzu Company and located in the Instrumental Analysis Laboratory of Food Engineering Faculty of Suceava.
The laboratory will include an electronic universal sand strength machine, a digital absolute permmeter, a rapid sand washer, a digital ultrasonic cleaner, a sand rammer, a methylene blue clay tester, an electronic mold hardness tester, a laboratory sifter and a drying oven.
NewAge Industries is one of the largest independently-owned hardness tester manufacturers and distributors in the market.
GE Inspection Technologies has gained industrywide recognition in the NDT industry as a near-`Total-solutions provider' by virtue of its significant presence in the radiography, ultrasonic and hardness tester equipment markets worldwide," says Frost & Sullivan industry analyst Jaidev Ram Mohan.
Tenders are invited for Portable Brinell Hardness Tester 1 Number.
As for impact load test the following methods are known: Shore, Poldi, Baumann-Steinruck, Leeb and other (Gutt,2000,2009), impact load test methods which are less standardized as compared to the static load ones because the stressing speed influences greatly hardness value, and companies produce a wide variety of stressing speed impact hardness tester.
The EQUOmatic hardness tester, available from Proceq, is capable of determining the hardness of metallic workpieces with the remarkable accuracy of [plus or minus]0.
For Portable Hardness Tester, Model-Dht-6, Probe-D, Dia-25Mm, 150Mm Long Alongwith Calibration With Hardness Tester.