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1. Ring：The height is 6.4mm， Upper aperture is 19.8mm， Lower aperture15.9mm。
2. Ball：Diameter is 9.5mm， Weight is（3.50±0.05）g。
3. Ball locating ring：Inner ring is 23.0mm，center is 9.55mm。
4. Test method：2 samples, parallel test
5. Support plate： 25.4mm from bottom。
6. Vessel：1000ml beaker。
7. Thermometer：Mercury-in-glass thermometer，range 30℃～180℃ Division is 0.5℃
8. Net weight：1.5kg
