Due to copyright restrictions, we are not able to provide copies of standards. Since some materials degrade near the melting region, care must be used to distinguish between degradation and transition. Standards can be obtained from appropriate standards authorities. You may delete a document from your Alert Profile at any time. Contact an expert today to let us know how we can make your next project a success.
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Asym Alert Profile lists the documents that will be monitored. Like all calorimeters, this technique tracks the amount of energy required to increase the temperature of a material by a certain amount.
Differential Scanning Calorimetry, commonly known as DSC, is a thermo-analytical technique for polymeric and non-metallic materials. Therefore, the heating rate must be reported as described in The ISO procedures provide additional information not supplied by this test method. For some polymers such as polyarylamides, crystallization is only possible from solution. The reference compartment contains an empty aluminum pan and cover equivalent to those used to encapsulate a test sample.
The DSC head area contains equivalent sample and reference compartments located adjacent to each other. In most cases, a mg specimen mass is satisfactory. Through our network of over 43, people in 1, laboratories and offices in countries, Intertek provides quality and safety solutions to a wide range of industries around the world. NOTE 6—In cases that high-temperature annealing cause polymer degradation, the use of shorter annealing times is permitted but shall be reported.
Melting or boiling points look like a downward endothermic peak since they absorb energy, glass transitions look like a stair step, and most curing reactions show an upward exothermic peak. Contact us for a quote.
ASTM D DSC 测转变温度_百度文库
adtm Element offers a wide range of experience in consulting, analytical testing, and industrial chemistry. This standard is not included in any packages. Take care to ensure? Enabling you to identify and mitigate the intrinsic risk in your operations, supply chains and business processes. The peak of an endotherm indicated melting temperature. We have no amendments or corrections for this standard.
ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the d34118 address or at phonefaxor service astm.
The instrument shall be calibrated at the same heating rate used sstm testing. Validating the specifications, value and safety of your raw materials, products and assets.
Both pans are heated at the same temperature ramp rate and the energy required to keep each one heating is continuously measured. Doing business with one of our laboratories enables our clients' access to our global platform of expertise, capacity and capabilities.
True heats of fusion are to be determined in conjunction with structure investigation, and frequently, specialized crystallization techniques are needed. Minimize the time of exposure to high temperature to avoid sublimation or decomposition.
Differential Scanning Calorimeter ASTM D3418, ASTM E1356, ISO 11357
Summary of Test Method 4. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Standards can be obtained from appropriate standards authorities. Use this curve to calculate the enthalpies of transition. Certain equipment allows the temperature range to be extended.
Since some materials degrade near the melting region, care must be used to distinguish between degradation and transition.