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Impactor Junior ]
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[ Rheologic
1000/2500 ]
"HDT" test means: determination of temperature of deflection under load
Field
of application
The test determines the temperature at which a specified deflection occurs when a standard test specimen is subjected to a bending stress, to produce one of the nominal surface stresses according to international standards. This test is very important for both quality control and research into plastic because it determines the heat resistance characteristics of materials, and is indispensable to define precisely the thermal behaviour of the polymers. The vallues obtained are indicative of the heat resistance characteristics of materials, and in specific case directly applicable for design purposes.
Method
The specimen, in the form of a rectangular bar of dimensions complying with the chosen standard, is tested as a simple beam with a load applied at midspan to produce a maximum, nominal surface stress according to the chosen standard. The test assembly, with the loaded specimen, is then immersed in a heat-transfer medium, equipped with a system capable of increasing the temperature linearly at a uniform rate (generally 2°C/min).
When the specimen reaches a specified deflection the temperature is recorded.
This value is indicated as the Temperature of Deflection Under Load, Tf, in degrees Celsius of the material under test.
"VICAT" test means: determination of the VICAT softening temperature
Field of application
The test determines the temperature at which a standard indentor penetrates 1mm under the surface of a test specimen under load. It is used to establish the differences between many types of thermoplastic materials and compounds with regard to their softening properties.
Method
An indenting tip of 1mm 2 circular cross sectional area is placed on the specimen and is loaded with a constant force (10 N or 50 N depending on the standard method used). The test assembly, with the loaded specimen, is immersed in a heat-transfer medium equipped with a system capable of increasing the temperature linearly at a uniform rate (generally, 50°C/hour or 120°C/hour).
The temperature when the needly has penetrated 1mm into the specimen, is recorded.
This temperature, expressed in °C, is indicated as the VICAT Softening Temperature of the material under load.
Standards
Designed and built to meet the following standards:
- "HDT" Test
ASTM D 648, ISO 75, DIN 53461, BSI 2782, Met. 121 C, NT T 51-005, UNE 53075, UNI 5641 and others equivalent. - "VICAT" Test
ASTM D 1525, ISO 306, DIN 53460, BSI 2782, Met. 120 C, NT T 51-021, UNE 53118, UNI 5462 and others equivalent.
| Technical Data | |
| Number of stations | 6 |
| Test capabilities | HDT, VICAT, CREEP, HDT and VICAT tests at the same time, DILATATION, MODULUS with dedicated software (optional) |
| Temperature range | 20 ÷ 300°C 20 ÷ 375°C (optional) |
| Thermal distribution | ±0.5 at 300°C |
| Thermal Stability | ±0.5 at 300°C |
| Tempreature preset accuracy | ±0.2°C |
| Temperature resolution | 0.1°C |
| Temperature ramps selectable via keyboard | 120°C ± 10°C/h
(12±1°C/6 min.) 120°C ± 10°C/h (12±1°C/6 min.) Operator may select any other rate between 50 and 120°C |
| Temperature measurement | 1-bath control (PT
100 ohms calibrated thermorsistance) 1-each station (PT 100 ohms calibrated thermorsistance) optional |
| Deflection/penetration measurement | LVDT |
| LVDT accuracy for each station | ±0.001mm |
| Automatic compensation for thermal expansion for each station | yes |
| Built-in microprocessor to carry out instrument processing with PID heating control | yes |
| Electronic control with alphamuneric polyfunctional keyboard | Liquid Crystal
Display 128 x 240 points CPU board and amplifier system included |
| Graphic display | Graphs, parameters |
| Deflection/penetration trasducer zeroing | automatic |
| Cooling system at test end | automatic |
| Cooling time from 200 to 50°C | 20 min approx. |
| Autocheck during test execution | yes |
| Nitrogen diffuser and electrovalve, to create a layer of nitrogen to prevent the heat transfer medium from degrading at high temperatures | yes |
| Nitrogen bottle and connections (separate) | optional |
| Oil pumps | 2 |
| Oil level dipstick | yes |
| Safety thermostat | yes |
| Heat transfer fluid | 20 kg |
| Binary mass system (one set for each station) consisting of a set of 13 masses to cover all HDT and VICAT tests using any mass from 67 to 5140g in steps of 1g | ancillary |
| HDT Test | |
| HDT capability to test sample in flatwise or edgewise position with 64 or 100mm fixed span according to international standards | yes |
| HDT with variable span from 60 to 210mm according to ISO 75-3 Standard | yes (on request) |
| Automatic calculation and list of masses to apply to reach defined stress according to norms | from 0.450 - 0.455 - 0.500 - 1.80 - 1.82 - 5.00 to 8.00 MPa |
| HDT testing heads complete with traceable certificates | one for reach station |
| HDT positioning tool for HDT head positioning | optional |
| VICAT Test | |
| 10 N and 50 N masses (1 set for each station) for VICAT tests only | Optional (alternatively for VICAT and HDT tests see Banary mass system) |
| VAICAT testing heads complete with traceable certificates | one for each station |
| Data Acquisition | |
| Parallel port for test printout | yes |
| RS 232 serial port for connection PC in conjunction with HDT300W software | yes |
| "HDT 300 W" software in Windows 95, 98, NT environment - code 0700.405 | option |
| Technical Characteristics | |
| Total bath capacity (1) | 1 |
| Overall dimensions (mm) | 1490 x 810 x 740 |
| Weight (kg) | 200 |
| Supply | 230V - 50Hz - Singlephare (110V - 60Hz on request) |
| Power (W) | 4000 |
| Paint | Fushia RAL 4006 - Gray RAL 7035 |
"HDT300W" Software code 0700.405
The program works in Windows environmenet, and an be run on any PC. The CEAST Software, specifically developed for the HDT VICAT Auto apparatus enables the user to perform the following operations and obtain the following processed results:
- Station calibration
- Test execution with data acquisition from apparatus
- Input data visualization with graphic
- Input data visualization with tables
- Saving and reloading of test data
- Saving and reloading of test parameters
- Calculation and display of the load weight needed to apply the required stress on the specimens