GB/T 30777-2014Detemination of flash point of adhesives - Close cup (English PDF)

3.1 Flashpoint

Under specified test conditions, using the sample vapor ignition source causing flash fire, corrected to 101.3kPa (760mmHg) most atmospheric correction

Low temperature.

Principle 4

The test sample was placed in a predetermined closed cup, immersed in heated pool. Pool heating temperature was slowly increased at a constant speed, the pool heating

The temperature difference between the liquid and the test sample does not exceed 2 °C, and to ensure that heating rate during the test sample is not more than 0.5 °C/1.5min. in

The heating process, a time of 1.5min intervals of not less than test firing. The lowest temperature recorded under flash appears calculated test product

Flash point temperatures and atmospheric pressure by 101.3kPa corrected.

To ensure that test at almost equilibrium conditions, it is recommended to use a slow heating rate. Because some of the low thermal conductivity or high viscosity products

Resistance to heat transfer. By using a stirring device to keep the temperature uniformity of the test sample (the ignition test without stirring operation).

The minimum ignition time interval should not be too small to ensure that the saturated vapor concentration in each test after test firing above the sample gas chamber.

When the measured adhesive at lower temperatures to form a "frozen state" impede stirring operation, the test sample at a constant temperature to the temperature setting

Follow-up test after at least 10min.

5.1 cups and lids closed

Closed cup. With inner lid and the liquid level indicator (see Figure 1).