標準號：IS 3972 Pt.2/Sec.4-1988
發布日期：1989/5/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This standard (Part 2/Sec 4) specifies a method for determining by successive thermal shock tests, the behaviour of vitreous enamel cooking utensils and similar articles under sudden changes of temperature.Note — A finished enamel coating is generally under a desired compressive stress. The stress is more or less altered under conditions of use; for example, cooking utensils are heated and cooled in such a way that the enamel may be subjected to tensile stress to which it is sensitive. This danger to a given enamelled article increases with the difference in temperature during thermal shock. It is for this reason that the test for thermal shock resistance is carried out with increasing thermal shock temperature.