ASTM D6801-07(R2021) pdf free download.Standard Test Method for Measuring Maximum Spontaneous Heating Temperature of Art and Other Materials.
1 .1 This test method covers a small-scale laboratory procedure to determine the self heating tendency of oil-based materials by exposure to elevated temperatures in air in a controlled semi-adiabatic system.
1.2 This test method has been developed to address an urgent need to identify oil-based materials that may require labeling for spontaneous heating tendency. Studies based on this test method may allow the development of a practice to identify such oil-based materials.
1.3 The values stated in SI units arc to be regarded as standard. The values given in parentheses are for information only.
3. Terminology
3. 1 Definitions:
3.1.1 maximum spontaneous heating temperature, n—maximum temperature reached during spontaneous heating under the specified test conditions.
3.1.2 oil-based materiaLs, n—seed and nut oils or materials that contain such oils.
3. 1 .3 spontaneous heatimig, n—exothermic reaction of a material due to slow or incomplete reaction that results in a temperature rise above that of its surroundings (see Test Method E77 1); also called self heating.
3.2 Symbols:
3.2.1 TD—difference between maximum spontaneous heating temperature and control temperature.
3.2.2 TS—maximum spontaneous heating temperature.
3.2.3 TC—control temperature or maximum spontaneous temperature measured over I h immediately preceding the beginning of an experiment.
4. Summary of Test NIethod
4.1 A non-woven paper cloth is covered uniformly in 9.0 mL of test material mixed with 0.25 mL of 6 to 10 % manganese drier. This covered pad is then put in a small stainless steel holder with air holes in the sides. This holder is placed in a larger chamber, which is opened to the air from the top and heated until peak temperature is reached. The maximum spontaneous heating temperature inside the soaked paper cloth is recorded with a K thermocouple and maximum temperature recorder with the base temperature adjusted to 70 ± 2°C.
5. SignifIcance and Use
5.1 This test method provides a means of accelerating the tendency of a material toward spontaneous heating that may eventually lead to a tire. It is applicable to liquids and pastes.ASTM D6801 pdf download.