儀器介紹：

英國(guó)Ray-Ran生產(chǎn)的環(huán)境應(yīng)力開裂儀RR/ESC符合ASTM D1693 標(biāo)準(zhǔn)，操作簡(jiǎn)單，測(cè)定當(dāng)高分子材料暴露在如肥皂泡、試劑、油和清潔劑等不同的環(huán)境中時(shí)的應(yīng)力開裂指數(shù)。將預(yù)應(yīng)力樣品放在固定在所測(cè)環(huán)境中的管中，再放在控溫浴中，大多數(shù)高分子材料一般設(shè)置在50℃。觀察樣品在規(guī)定時(shí)間間隔內(nèi)，由小裂縫發(fā)展到開裂。

標(biāo)準(zhǔn)配置：

0-400 °C數(shù)字溫度測(cè)量、控制及顯示
連續(xù)控溫的不銹鋼液浴
切斷樣品的打孔機(jī)和模
采集裂痕的夾具，使樣品中形成可控的破裂
把樣品彎成”U”型的彎曲夾鉗
在試管中固定樣品的夾具
將樣品從夾鉗移到夾具的工具
一個(gè)樣品夾具可容納多達(dá)10個(gè)樣品
48個(gè)玻璃試管和橡膠塞

Product Description
Environmental Stress Cracking. is one of the most common causes of unexpected brittle failure of thermoplastics polymers known. Research has shown that the exposure of polymers to liquid chemicals accelerate the crazing process.

The Ray-Ran Stress Cracking Apparatus has been designed in accordance with the ASTM D1693 test method, it is simple to use and an extremely cost effective method of determining a polymer material’s susceptibility to stress cracking when exposed to different environments such as soaps, wetting agents, oils and detergents.

The material is cut to shape with the die cutter provided and notched and then the test sample bent into a “U” section to induce the required stress. The samples are placed into the sample holders which are then transferred to the glass test tubes. These tubes are filled with the selected environment and heated. At timed intervals the samples are checked for any cracks developing adjacent to the notch. The number of failures is recorded.

Standard features include
Digital temperature display and control, Constant temperature controlled stainless steel liquid bath, Sample Cutter to cut out test samples, Sample nicking jig to make the controlled imperfection in the test samples, Sample bending clamp to bend the test samples into a controlled “U” shape, Specimen holders to house the test samples in the test tubes (up to 10 test samples can be housed in each specimen holder), Sample transfer tool to move the test sample from the clamp to the specimen holders, 48 glass test tubes and rubber stoppers, Product user manual, CE mark of conformity, 1 year return to base warranty,

Test Description
The test sample is notched and then bent into a “U” section to induce the required stress. The samples are placed in the glass tubes, filled with the selected environment and heated. At regular intervals the sample are checked for any cracks developing adjacent to the notch.

Part Numbers
RR/ESC – Environmental Stress Cracking Apparatus, — ESC 029 – Spare Pack of 10 Nicking Blades

Complies with Standard(s)
ASTM D1693