Physical Property Profile Custom Extrusion

Physical Property Profile Custom Extrusion Description Explanation of Physical and Mechanical Properties of Plastics 1. Density It is the ratio of the weight of the weighed sample to the weight of the accumulated water in the same body at a certain temperature, in g/cm3, commonly measured……

Physical Property Profile Custom Extrusion Description

Explanation of Physical and Mechanical Properties of Plastics

1. Density

It is the ratio of the weight of the weighed sample to the weight of the accumulated water in the same body at a certain temperature, in g/cm3, commonly measured by the liquid buoyancy method.

2. Water absorption

The water absorption of plastics refers to the amount of water absorbed by a sample of a specified size after being immersed in distilled water at a certain temperature of (25 ± 2) ℃ for 24 hours; The absorption of water affects its size and shape, and the water absorption rate is often expressed in% when expressed by weight.

3. Breathability

Permeability refers to the volume (cm3) of gas that a plastic film of a certain thickness can penetrate through a square meter area under atmospheric pressure within 24 hours. However, the permeability is related to the thickness, area, time, temperature, and pressure difference of the thin wax.

4. Moisture permeability

Moisture permeability refers to the penetration of water vapor through plastic films, with the same basic principle and definition as permeability.

5. Transparency

The ratio of the luminous flux passing through an object to the luminous flux emitted onto the object is called transmittance; The ratio of scattered light in the direction of incident light to all transmitted light, known as haze or turbidity. Haze is usually semi transparent and has a diffuse property towards incoming light.

6. Tensile strength

Tensile strength refers to the maximum load applied along the longitudinal axis of a specimen at a specified test temperature, humidity, and tensile speed to determine its failure.

7. Compressive strength

Compressive strength refers to the strength at which a compressive load is applied to a specimen to rupture (for brittle materials) or yield (for non brittle materials).

8. Bending strength

Bending strength refers to the strength of a specimen when a concentrated load is applied at two supporting points, causing the specimen to deform or rupture.

9. Impact strength

Impact strength refers to the joules consumed per unit area when a specimen is subjected to impact fracture. For certain plastics with high impact strength, a specified size gap is often made in the middle of the specimen, which can reduce the joules required for fracture.

Different test methods can be used for different specimens: drop ball impact test and high-speed tensile impact test.

10. Friction coefficient

The coefficient of friction refers to the ratio of frictional force to normal pressure. Adding a positive pressure to the sample determines the dynamic and static ratio of the sample during rigid motion.

11. Wear and tear

Wear refers to the mechanical failure process of plastic during friction, where particles continuously separate from the friction surface, causing the size of the friction component to change continuously. It is also known as wear or erosion.

12. Hardness

Plastic hardness refers to the resistance of plastic to the pressure of other hard objects, commonly known as Rockwell hardness and Shore hardness.

Shaw hardness refers to the depth at which the indenter needle is pressed under a specified pressure and time.

Shaw indenters can be divided into two types: Type A and Type D. The applied load weight is 1.0 and 5.0 kilograms, and the pressing time is 15 seconds. Type A is suitable for soft plastics, while Type D is suitable for semi hard plastics; When using Type A and measuring over 95% of the range, Type D should be used. When Type D measures over 95% of the range, Rockwell indentation needs to be used instead.

13. Fatigue strength

It refers to the strength that causes plastic damage in an environment with a static destructive force and a small amount of alternating cycles; The sources of fatigue load include tension and compression, bending, torsion, impact, etc.

14. Creep

Creep refers to the characteristic that plastic exhibits over time under constant external forces under certain temperature and humidity conditions. This deformation characteristic increases with increasing load, decreases with decreasing load, and gradually recovers. The sources of creep include tensile creep, compressive creep, bending creep, etc.

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