Melt index test method
Melt Mass Flow Rate (MFR)
Melt Volume Rate (MVR)
This method is to determine the melt flow rate of a thermoplastic sample under certain conditions.
This method is suitable for thermoplastics.
1. How to use the pencil hardness tester:
1. It must be carried out in a good laboratory environment, and start the test with a harder pencil
2. Place the installed pencil hardness tester gently on the surface of the object to be tested
3. Grasp both sides of the pulley with your fingers, and push forward 10mm at a speed of 5…10cm/sec, one time, no dragging back and forth
4. Observe whether the surface of the sample is scratched with the naked eye?
5. In the order of pencil hardness, gradually test from hard to soft until the tip of the pen does not scratch the coated surface at all
6. Note: Any scratches or damage caused by the pen tip are regarded as scratches
What is static electricity
The name means static electricity. Such charges are the result of electron migration. These are due to changes, friction or material separation. They are the main generators of electrostatic voltage. For example: plastics, glass fiber, rubber, textiles, etc. Under proper conditions, this charge can generate a voltage of 30,000 or 40,000 volts. When an insulating material is created, like plastic, the accumulated charge remains in the stagnation area.
When the plastic material and the human body are in contact with a suitable voltage, such as humans or microcircuits, these electrostatic voltages can then be released through arcs or sparks
The problem of electrostatic charge accumulation and electrostatic discharge has limited many applications of "insulating" plastics, which are usually evaluated by the measurement of surface resistivity (SR) in ohms/sq. The lower the resistivity value, the more conductive the material.