Payment & Shipping Terms:
|Product Name:||HDT Vicat Testing Machine||Stations:||3|
|Medium:||Methyl Silicon Oil||Deformation Resolution:||0.001|
HDT Vicat Testing Machine Plastics determination of temperature of deflection under load ISO75 HVT302A
This series of HDT/VICAT testing machine is mainly used to determine temperature of deflection under load and Vicat softening temperature of thermoplastic plastics, pipes and fittings.
ISO2507, ISO75, ISO306, ASTM D648, ASTM D1525
ISO 75-1:1993 and ISO 75-2:1993 described three methods (A, B and C) using different test loads and two
specimen positions, edgewise and flatwise. For testing in the flatwise position, test specimens with dimensions 80 mm × 10 mm × 4 mm were required. These can be moulded directly or machined from the central section of the multipurpose test specimen (see ISO 3167). These “ISO bars” cannot be easily used in the edgewise position, because this would require both a reduction in span and an increase in test load by the same factor, and this may be impossible to achieve on existing instruments for edgewise testing. Specimens for testing in the edgewise position are less closely specified. Using the 80 mm × 10 mm × 4 mm ISO bar has the following advantages:
Thermal expansion of the test specimen has less influence on the test result.
Draft angles do not influence the test result. The specimen does not stand “on edge”.
The moulding parameters and the specimen dimensions are specified more closely.
This increases the comparability of the test results. Therefore, it was decided that the possibility of testing in the edgewise position would be deleted from the standard. In order to provide a sufficient transition period, in this edition the flatwise position is described as the preferred and recommended one, while testing in the edgewise position is optional and has been moved to a normative annex (in this part of ISO 75). This annex and all other references to edgewise testing will be deleted on occasion of the next revision of this document.
Earlier editions of this International Standard allowed methods other than using a heating bath for heating the test specimen, namely forced-circulation ovens or fluidized beds. None of these alternative methods is widely used and no proven instruments are commercially available. Furthermore, there is no general comparability between tests using different heating methods due to the differences in the heat transfer characteristics and the temperature control methods described in this standard. Therefore only heating in heating baths is allowed in this edition.
In order to maintain consistency with ISO 10350-1:1998, It has been used as the symbol for temperature of deflection under load.
|Heat transfer medium||
Methyl Silicon oil
Viscosity: 300 cSt, or 300 mm2/s
Known silicon oil brand: DON CORNING PMX-200 350 cSt, Shin-Etsu KF96-300
Or transformer oil
|Temperature range||Ambient (20℃)~300℃|
|Heating speed||Speed A||5±0.5℃/6min|
|Deformation measurement range||±5mm|
|Deformation measurement accuracy||0.003mm|
|Vicat Loading capacity:||GA=10N±0.2N, GB=50N±1N|
|HDT test||Method A: USE FIBRE STRESS 1.80Mpa|
|Method B: USE FIBRE STRESS 0.45Mpa|
|Method C: USE FIBRE STRESS 8.00Mpa|
|Maximum heating power||4500W|
|Power requirements||AC380V±10% 50HZ 15A|
|Cooling||Nature cooling or water cooling|