1、在标准环境下，用测厚仪测量试样的厚度，试样的耐候面应无明显的缺陷。

将试样的耐候面朝外弯曲180°，使50mm（或25mm）宽的便于重合齐平，并确保不发生错位，可用固定平或订书机或10mm宽的胶布将边缘固定。

2、将弯折机的上下平板间距调到试样厚度的三倍。

3、将弯折机上平板翻开，将试样平放在上平板上，重合的一般朝向转轴，且距离转轴20mm（25mm）。将弯折机连同试样放入低温箱内，在规定的温度下保持1h（或2h），然后在1s之内将弯折机上平板压下，是达到所调间距位置，保持1s，将试样取出。待回到室温后，观察试样弯曲处是否断裂，或用放大镜观察试样弯折受拉面是否有裂纹。

4、两块（或三块）试样均不断裂或无断纹时，评定为无裂纹。

DWZ-120弯折机性能特点
DWZ-120型弯折机是根据标准GB12952-91，CB/T16777及JC500-92的要求设计制造，既合适做防水卷材的低温弯折实验，又适合防水涂料的低温柔性的测定。

DWZ-120弯折机公司介绍
DWZ-120弯折机

本公司主要产品有：

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The company＇s main products are: concrete test equipment, cement test equipment, maintenance box, maintenance room, asphalt test equipment, emulsified asphalt test equipment, waterproof coil test equipment, soil test equipment, soil test equipment, fine aggregate test equipment, brick wall test equipment, CA mortar test equipment, steel connection sleeve ａnd so on. The main products of our factory are: Concrete Press, ready-mix concrete, steel bar puller, anchor Rod Puller, cement fineness negative pressure screen, core drilling machine, concrete anti-permeability machine, cement mortar mixer, cement paste mixer, electric Jump Table, asphalt penetration, asphalt softening point, asphalt low temperature extensometer, asphalt viscometer, Marshall Stability Instrument, Marshall compaction instrument, electric compaction instrument, engineering test model, etc. . These products are widely used in: concrete business, mixing stations, laboratories, institutions of higher learning, municipal, roads, railways, tunnels, bridges, petrochemical, water construction, ａnd other fields. The factory with reasonable prices, warm service attitude, skilled after-sales protection to provide you with quality service. We in line with the rapid delivery, the implementation of three guarantees, services ａnd other business principles dedicated to the majority of users.