News
How the Vicat temperature measures the heat resistance of the UPVC pipe & valve?
How the Vicat temperature measures the heat resistance of the UPVC pipe & valve?
The working temperature limit of upvc valve, pipe is 0-70℃. Normal temperature is suitable for working of UPVC material. if the working temperature is increased, the ratio of the internal pressure strength should be relatively reduced. The ratio of pressure resistance under various temperatures is shown in the following table as reference.
The relationship between the working temperature of UPVC valve pipe and pressure resistance:
Working temperature |
20 |
25 |
30 |
40 |
50 |
60 |
pressure ratio |
100 |
95 |
85 |
65 |
35 |
10 |
UPVC pipe heat resistance in the specific test has a special test method that is the Vicat softening temperature test. Next we introduce the purpose of this test and testing methods.
01 test purpose: UPVC valve pipe is easy to deform after heat, to the Vicat temperature to measure the heat resistance of the pipe and valve
02 Test equipment: Vicat testing machine
03 test description:
(1) the specimen is placed in a liquid medium, under the condition of isothermal temperature rise to determine the standard pressure needle (cross-sectional area of 1mm2) under the action of 50 N force, pressed into the specimen lmm when the temperature, that is, the specimen's Vicat Softening Temperature ( VST ).
(2) Vicat softening temperature is to evaluate the heat resistance of materials, reflecting the physical and mechanical properties of products in the heat conditions of one of the indicators.
(3) The higher the Vicat softening temperature, the better the dimensional stability of the material when subjected to heat, the smaller the thermal deformation, i.e., the better the heat deformation resistance.
(4) national standard requirements for PVC-U water supply pipe Vicat softening temperature ≥ 80 ℃, we Chuanli Plastics Co., Ltd. production of water supply industrial chemical valve pipe Vicat temperature is generally 82 ~ 83 ℃. Drainage pipe material national standard requirements Vicat softening temperature ≥ 79 ℃, we chuanli Plastics Co., Ltd. production of PVC-U drainage pipe Vicat softening temperature is generally 80 ~ 81 ℃.