儀器介紹：

英國Ray-Ran生產的環境應力開裂儀RR/ESC符合ASTM D1693 標準，操作簡單，測定當高分子材料暴露在如肥皂泡、試劑、油和清潔劑等不同的環境中時的應力開裂指數。將預應力樣品放在固定在所測環境中的管中，再放在控溫浴中，大多數高分子材料一般設置在50℃。觀察樣品在規定時間間隔內，由小裂縫發展到開裂。

標準配置：

0-400 °C數字溫度測量、控制及顯示
連續控溫的不銹鋼液浴
切斷樣品的打孔機和模
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
一個樣品夾具可容納多達10個樣品
48個玻璃試管和橡膠塞

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