ASTM D1525塑膠維卡軟化溫度之量測
塑膠的高溫機械特性可能會限制其廣泛應用。有些聚合物能耐受200度或更高的溫度，而另一些在100度前就會破壞。維卡軟化溫度(Vicat Softening Temperature, VST)讓使用者能夠精確測定其產品在這些高溫下保持表面性能的能力。
測試透過將點負載施加到試樣上，並以穩定速率升高該試樣的溫度來進行。當點負載穿入試樣1mm時，測試結束並記錄溫度。結果將可用於開發或品質控制等目的，但不應在設計計算中使用。測試本身十分彈性，因為沒有規定試樣的尺寸或形狀，且試樣可以有一個厚度範圍。
ASTM維卡測試涵蓋ISO等效標準ISO 306。在許多方面，此測試在技術上是相同的，但最初潛變的說明與本標準不同。此外，ASTM D1525標準允許使用流體化粉末作為傳熱介質。經證實此新系統令人滿意，且在500℃內短時間熱循環的情況下安全。對於標準軟化溫度高於300℃的所有材料（例如PEEK、PEI、LCP等），給了它們進行熱機械測試的機會。
關於測試，HV系列熱機械測試儀完全以遵守這些標準為定位，這些機器以直觀機上控制（可選自動控制）和易於更換測試頭為特色，多功能且能適應您變化的熱機械測試需要。我們甚至可為不適合油基系統的實驗室提供含有無油傳熱媒介的HV500系列。
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.
- Products
- 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.
- Products
- 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.
- Products
- 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.
- Press Releases
- 8/31/2011
- 365.2 KB