In general, with materials of these types, softening does not take place at a definite temperature. As the temperature rises, these materials gradually change from brittle or exceedingly thick and slow-flowing materials to softer and less viscous liquids. For this reason, the determination of the softening point must be made by a fixed, arbitrary, and closely defined method if the results obtained are to be comparable.
In these test methods, the softening point is defined as the temperature at which a disk of the sample held within a horizontal ring is forced downward a distance of 25.4 mm (1 in.) under the weight of a steel ball as the sample is heated at 5x00B0;C/min in a water, glycerin, silicone oil, ethylene glycol/water or glycerin/water bath.
1.1 These test methods are intended for determining the softening point of resins (including rosin and terpene resins) and similar materials by means of the ring-and-ball apparatus.
Note 18212;For testing asphalts, tars, and pitches, see Test Method D 36.
1.1.1 Test method using the manual ring and ball softening point apparatus, and
1.1.2 Test method using an automated ring and ball softening point apparatus.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
为热变形维卡温度测定仪,是根据GB/T1633《热塑性塑料软化温度(VST)的测定》、GB/T1634《塑料弯曲负载热变形温度试验方法》、GB8802《硬聚氯乙烯(PVC-U) 管材及管件维卡软化温度测定方法》以及 ISO75 、ISO306 、ISO2507 、ASTM1525 ASTM D648标准的要求设计制造的,广泛用于热塑性塑料、硬橡胶和长纤维增强复合材料等热变形温度(HDT)和维卡温度...
生产商• 德国GOETTFERT• 美国Tinius Olsen• 意大利CEAST 热变形试验机HDT标准:ISO 75ASTM D 648GB/T 1634 VST标准:ISO 306ASTM D 1512GB/T 1633 热变形温度/维卡软化点温度测定仪简介把一个具有一定尺寸要求的矩形试样,放在规定跨距的支座上,并在两支座的中点处,施加规定的负荷,形成三点式简支梁式静弯曲,负荷力的大小,必须使试样形成...
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