ASTM D1525 塑料维卡软化温度的测定
塑料的高温机械性能可能会限制其广泛应用。有些聚合物能耐受200度或更高的温度，而另一些却不能耐受100度。维卡软化温度（VST）使用户能够精确测定其产品在这些高温下保持表面性能的能力。
试验通过将点载荷施加到试样上并以稳定速率升高该试样的温度来进行。当点载荷刺入试样1毫米时，结束试验并记录温度。然后就可将结果用于开发或质量控制目的，但不应在设计计算中使用。试验自身十分灵活，因为没有规定试样的尺寸或形状（超过特定最小足迹），并且试样可能有一个厚度范围。
ASTM维卡试验涵盖ISO等效标准 ISO 306。在许多方面，此试验在技术上是相同的，但初始蠕变的说明与本标准不同。此外，ASTM D1525标准允许使用流化粉末作为传热媒介。经证实，此新系统令人满意，在500℃以下短时间热循环情况下安全。对于标准软化温度高于300℃的所有材料（例如PEEK、PEI、LCP等），开启了进行热-机械试验的窗口。
至于试验，HV系列 热-机械试验仪完全以遵守所有这些标准定位。这些仪器以直观机载控制（可选自动控制）和容易更换试验头为特色，通用且能适应您变化的热-机械试验需要。我们甚至可为不适合油基系统的实验室提供含有无油传热媒介的 HV500 系列。
此外，我们还可提供许多用于为 试验准备 冲切和铣削您试样的试样准备解决方案。为了运行ASTM D1525试验，请查阅 这里 可用到的标准。
CEAST HDT Vicat Series 3 and 6 Stations Testers
The effect of temperature on the mechanical properties of plastic materials has a fundamental role in the design of components, especially in the selection of materials. Unlike metals and ceramics, plastics are extremely sensitive to the slightest changes in temperature. The selection of plastics for applications under different temperatures is a complex task. The material must be able to support a stress under operating conditions without losing its strength and without critical distortion. The effect of temperature on geometrical stability and mechanical properties in general can be studied following different procedures and methods like at constant temperature or with a temperature ramp.
- 产品
- 6/19/2012
- 1.2 MB
CEAST HDT Vicat Series HV500
The effect of temperature on the mechanical properties of plastic materials has a fundamental role in the design of components, especially in the selection of materials. Unlike metals and ceramics, plastics are extremely sensitive to the slightest changes in temperature. The selection of plastics for applications under different temperatures is a complex task. The material must be able to support a stress under operating conditions without losing its strength and without critical distortion. The effect of temperature on geometrical stability and mechanical properties in general can be studied following different procedures and methods like at constant temperature or with a temperature ramp. From very simple units for QC labs to more advanced and automated systems, the Instron line of CEAST Thermal testers are designed to measure the heat deflection temperature (HDT) and the Vicat softening temperature (VST) according to the related ISO and ASTM international standards.
- 产品
- 5/11/2017
- 154.4 KB
Instron HV Series for HDT and Vicat Testing
The effect of temperature on the mechanical properties of plastic materials has a fundamental role in the design of components, especially in the selection of materials. Unlike metals and ceramics, plastics are extremely sensitive to the slightest changes in temperature. The selection of plastics for applications under different temperatures is a complex task. The material must be able to support a stress under operating conditions without losing its strength and without critical distortion. The effect of temperature on geometrical stability and mechanical properties in general can be studied following different procedures and methods like at constant temperature or with a temperature ramp.
- 产品
- 6/21/2018
- 1.2 MB
CEAST AlOxide® performs HDT and Vicat Tests at up to 500 °C
The newly developed Instron CEAST AlOxide® thermal tester determines the Vicat softening temperature and HDT heat deflection temperature of plastics at temperatures up to 500 °C, allowing measurements to be conducted even on highly temperature resistant thermoplastics such as PEEK. Unlike conventional instruments, which use silicone oil as heating medium and typically offer maximum temperatures of 300 °C, the Instron CEAST AlOxide uses heat-resistant aluminium oxide powder in a fluid bed. The method is expected to be adopted in the relevant European standards in the near future.
- 新闻发布
- 8/31/2011
- 365.2 KB