Abstract
Analytical weights of various modern materials, including a large proportion of plated types, have been subjected to accelerated corrosion and stability tests in five representative chemical laboratories. As regards stability of mass there was little to choose between the weights of austenitic stainless steel (25% Cr, 20% Ni), non-magnetic nickel-chromium (80% Ni, 20% Cr), and the plated weights having a nominal thickness of plating of about 0.015 mm (0.0006 in) or more; some weights of specially highly-polished stainless steel were, however, slightly superior. Chromium-plated weights retained their appearance better than any except perhaps those of highly-polished stainless steel and nickel-chromium, but they are open to the objection that the underlying nickel is slightly magnetic. No kind of weight appeared to be much more suited to one laboratory than to another. Lead should not be used for the adjustment of weights whether they are likely to be exposed to corrosive atmospheres or not. The paper also includes information on the behaviour of weights of various materials under good conditions.
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