The Comparison of New and Old Sweating Guarded Hotplate Testing Standards

In China textile industry, the earliest sweating guarded hotplate testing standard is GB/T11048-1989 which uses flat plate heat insulation device for insulation test. This method played positive role but it has following defects because of the technical limitations.

                                        sweating guarded hotplate

1.      The insulation rate is so different from that used by the international standard that the testing result couldn’t be exchanged.

2.      The concept of“insulation”has huge limitations, while thermal resistance can express textile heat transferring performance which is quite close to human physical comfort. 

3.      There are huge differences of insulation rate and thermal resistance in windless and windy environments. Thermal resistance reduces when there is wind, while the insulation rate rises which turns out to be opposite to the actual situation. Thus insulation rate is meaningful only in a certain situation.

                                                sweating guarded hotplate testing

The earliest sweating guarded hotplate testing method is ISO11092 which was formulated on the basis of flat plate tester developed by German scientists. It was released in 1993 and has been used today. ASTM F1868 is similar to it and there are several differences on testing environment and specifications.

China lately sweating guarded hotplate testing method is GB/T 11048-2008 and the main testing method A is the same as ISO11092; while method B-flat plate testing standard was used in some special situation.

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