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 ?
Procedure: Press the base of the hardness tester firmly against the end of a standard 2 X 2-in.
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.
and Ireland for: BAREISS GmbH of Germany who produce SHORE & IRHD hardness testers to test rubber, plastic, elastomer and silicone materials including O'rings, abrasion testers, resilience elasticity testers, and materials testers for other applications.
In contrast to traditional hardness testers, instrumented indentation systems allow the application of a specified force or displacement history, such that force, P, and the displacement, h, are controlled and/or measured simultaneously and continuously over a complete loading cycle.
At present, no matter the static or impact testing method used, a specific hardness tester is needed to put them into practice.
This latest software enables a Vickers hardness tester to provide automatic measurement of grains and phase analysis which maximises the value of the hardness tester optics.
The system developed is based on the Zwick Roe11 Indentec 4150SK Rockwell hardness tester which carries out tests in compliance with ISO 6508 and ASTM E18.
Tenders are invited for Standard Probe Type D Suitable For Portable Hardness Tester Model D-2 Of Dietmer Make Spare For Portable Hardness Tester Measwing Range Of Probe Should Be As Follows Brinell Hardness 30 - 650 Vickers Hardness 80-940 , Rockwell C 20-70.
The DigiChamber consists of a hardness tester and a temperature chamber that can carry out tests on a sample by analyzing three different positions simultaneously, allowing companies to conduct more rigorous tests and ensure greater consistency across products.
Keighley Laboratories has added a Zwick Roell ZHV-10 automatic micro and macro hardness tester to its test house resources.
The advanced hardness tester has multiple objective lenses and indenters and intuitive software to assist the operator in setting up test routines.