Vinyl resin is a kind of high molecular polymer made of ethylene monomer as the main raw material. Its molecular chain is composed of ethylene units alternately. It has the characteristics of high transparency, excellent mechanical properties and chemical corrosion resistance. Vinyl resin is widely used in plastic products, pipes, films, packaging materials, optical fibers and other fields. Common vinyl resins include polyethylene, polypropylene, vinyl acrylate copolymer, and the like.
The following are the properties and test methods of common vinyl resins that need to be tested, as shown in the following table:
| Performance | Test Methods |
|---|---|
| density | ASTM D792 |
| Melt flow rate | ASTM D1238 |
| melt index | ASTM D1238 |
| The melt flow rate | ASTM D1238 |
| melting point | ASTM D3418 |
| hardness | ASTM D2240 |
| Tensile Strength | ASTM D638 |
| Tensile modulus | ASTM D638 |
| elongation at break | ASTM D638 |
| tensile strength | ASTM D882 |
| Tensile modulus | ASTM D882 |
| elongation at break | ASTM D882 |
| Impact strength | ASTM D256 |
| Heat distortion temperature | ASTM D648 |
| chemical resistance | ASTM D543 |
| heat resistance | ASTM D794 |
| cold resistance | ASTM D1790 |
| Oxidation resistance | ASTM D3895 |
| Heat Stability | ASTM D3418 |
| transparency | ASTM D1003 |
| chromatic aberration | ASTM D2244 |
The above indicators are all for different types of vinyl resins, and the specific test methods and standards can be adjusted according to the actual situation. It should be pointed out that the above test items are not all, and other performance indicators may need to be considered in actual applications to meet different application requirements.
Detection method
The following is a detailed description of the test methods for common properties of vinyl resins:
Density test: ASTM D792 samples usually need to be made into specimens of specified size and shape, and then the density value of the sample can be calculated by measuring the mass and volume of the specimen.
Melt flow rate test: ASTM D1238 samples are heated and extruded under specific conditions for a period of time, and the melt flow rate value is calculated by measuring the mass and time of the extruded plastic.
Melt index test: ASTM D1238 samples are heated and extruded under specific conditions for a period of time, and the melt index value is calculated by measuring the mass and time of the extruded plastic.
Melt flow rate test: ASTM D1238 samples are heated and extruded under specific conditions for a period of time, and the melt flow rate value is calculated by measuring the mass and time of the extruded plastic.
Melting point test: ASTM D3418 samples are tested by heating and cooling process under specific conditions to obtain the melting point value.
Hardness test: ASTM D2240 samples are pressed into a Hardness Tester at a certain depth, and the hardness value is calculated from the readings.
Tensile strength, tensile modulus, elongation at break test: ASTM D638 samples undergo a series of tensile tests, and the tensile strength, tensile modulus, elongation at break, etc. are calculated from the tensile force and elongation data of the testing machine value.
Impact strength test: ASTM D256 samples pass a specific impact test, and the impact strength value is calculated.
Heat distortion temperature test: ASTM D648 samples are heated and cooled under specific conditions, and the deformation temperature of the sample is measured.
Chemical corrosion resistance test: ASTM D543 samples are exposed to certain conditions to evaluate their chemical corrosion resistance.
Heat resistance test: ASTM D794 samples are subjected to a heating test at high temperature for a period of time to evaluate their heat resistance.
Cold Resistance Test: ASTM D1790 samples are tested at low temperature for a period of time to evaluate their cold resistance.
Tensile-shrinkage property test: After ASTM D955 samples undergo a certain heat treatment, tensile and shrinkage tests are carried out under specific conditions to evaluate their tensile-shrinkage properties.
UV Resistance Test: ASTM G154 samples are exposed to UV rays under specific conditions to evaluate their UV resistance.
Flame Resistance Test: UL94 samples are evaluated for their flame resistance through specific burn tests.
Water resistance test: ASTM D870 samples are subjected to water immersion and drying cycles under specific conditions to evaluate their water resistance.
Weather resistance test: ASTM D2244 samples are subjected to specific climate conditions and light conditions to evaluate their weather resistance performance.
Machinability Test: ASTM D2235 samples are subjected to specific processing conditions to evaluate their machinability.
Compressive Strength Test: ASTM D695 samples are subjected to a compression test under specific conditions to evaluate their compressive strength properties.
Chemical corrosion resistance test: ASTM D543 samples are exposed to certain conditions to evaluate their chemical corrosion resistance.
Electrical Performance Tests: ASTM D150 samples undergo specific electrical tests to evaluate their electrical properties.
Thermal Conductivity Test: ASTM C518 samples are subjected to a specific thermal conductivity test to evaluate their thermal conductivity performance.
Anti-ultraviolet performance test: ASTM G154 samples are exposed to ultraviolet light under specific conditions to evaluate their anti-ultraviolet performance.
The above test methods are not comprehensive, and the specific test methods should be selected according to the actual situation.
