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Thermal properties of engineering plastics

1. Appearance after heating

Show the character that model forms heat resistance degree, be divided commonly by physical heat resistance and chemical heat resistance.The former refers to the plastic molding sample of the specified shape to maintain the performance of the product shape at the specified heating temperature;The latter represents the thermal stability of molecular bonds in the plastic material.

2. The heat capacity

Specific heat capacity refers to the heat capacity relative to the unit mass (1g) of the plastic molding products.Usually said plastic molding product calories when temperature is higher than 1 ℃.

3. vicat

Vicat refers to take shape, the size of the plastic molding sample in its central part put on a load of 1 kg, 1 mm diameter at the top of the flat needle, at the rate of average 60 min temperature 50 ℃ to heat up.The temperature of the sample when the tip of the sample was inserted into 1mm after softening is expressed.

4. Load deflection temperature (heat type temperature)

The flexure temperature of load is a method to determine the rigidity of plastics under high temperature.

5. Linear expansion coefficient

Linear expansion coefficient is refers to under certain pressure, the plastic products in the temperature of expansion ratio in the case of 1 ℃.Is the coefficient of linear expansion relative to unit length.

6. Thermal conductivity

Thermal conductivity said within 1 s by temperature difference is 1 ℃, covers an area of 1 c ㎡, thickness is 1 cm of the quantity of heat of plastic products, is the reference index of the insulating products stays.

7. The embrittlement temperature

The end of the shaped sample with specified shape and size is clamped with the test clamp, fixed in the test tank, soaked in the specified low-temperature heat transfer medium, and placed (3+-0.1)min later, the embrittlement temperature of the sample is calculated by striking it once with the hammer.