HDT/Vicat Standard

The Vicat testing instrument consists of a bath with an option to mount measuring heads. A built-in thermostat controls the bath temperature. The thermostat ensures a constant increase of the temperature with the standardized gradient over the entire test sequence.
Not only Vicat but also HDT tests can be performed with the measuring heads by simple mechanical conversion. The measuring heads accept the specimen and measure the puncture by the Vicat needle during Vicat tests or deflection of specimens during HDT tests via the installed digital measuring transducer.
In this configuration the Vicat testing instrument can be operated as a manual testing instrument. This means that you have to record the values of the digital measuring transducer and the temperature sequence manually.
We recommend the PC expansion as an accessory. It includes an interface box, the current testXpert software and the respective communication leads. The PC expansion enables fully automatic evaluation of the test job, printout of a test report as well as operation of the Vicat testing instrument via a PC. Temperature and travel values are recorded and saved together with the test parameters.

Key Advantages and Features

  • Optional external re-cooling device for faster attainment of starting temperature
  • Testing to ISO 306, ASTM D1525, ISO 75 and ASTM D648.

Range of application

  • Determination of heat deflection temperature (HDT)
  • as per ISO 75, Parts 1 to 3, and ASTM D648, Methods A and B, on thermoplastics, hard rubber and fiber-reinforced and filled thermosets.
  • Determination of Vicat softening temperature (VST)
  • of thermoplastics as per ISO 306 and ASTM D1525 .
  • Determination of creep behavior
  • under flexural load

Functions, elements and interfaces

  • built-in microprocessor-controlled electronics for temperature control and measured-value acquisition
  • measured values clearly displayed
  • safety thermostat
  • electronic level-monitoring
  • test control and data acquisition via PC with ZwickRoell Prüfsoftware (2 RS232 interfaces required in PC; 1x for temperature channel, 1x for displacement channel)
  • integrated compensation for heat expansion of measuring stations with PC operation
  • manual lowering of measuring stations
  • manual application of test weights.

Test sequence

As soon as the heat-transfer fluid has reached the starting temperature, the specimens are inserted into the measuring stations and lowered manually into the oil bath. In the next step the test weight specified in the standards is applied manually and the menu-driven test-sequence is started on the PC.

On completion of pre-heating under the influence of force, the displacement signals are zeroed (program-controlled) and the heating of the heat-transfer fluid at the pre-set rate is started. As soon as the required deflection, outer-fiber strain or penetration is attained, the heating is switched off and the test is ended.

Re-cooling of the heat-transfer fluid is started manually or by the PC via a solenoid valve. Specimens can afterwards be removed.

Recooling the heat-transfer liquid

Instrument cooling is via a cooling coil located in the oil-bath. Coolant (water) can be pumped in via a connection located on the left-hand side of the instrument.

Water-cooling is switched on manually, but not before 130°C at the earliest. For faster re-cooling a connection for an external re-cooling unit is available.

Technical Overview

Temperature range up to 300°C

HDT/Vicat with temperature range up to 300°C

Type

HDT/Vicat 3-300 S

HDT/Vicat 4-300 S

HDT/Vicat 6-300 S

Item No.

326030

326036

No. of measuring stations

3

4[1]

4 to 6

Maximum number of measuring stations

3

Maximum temperature

+ 300

+ 300

°C

Temperature range

+20 to +300

+20 to +300

+20 to +300

°C

Re-cooling

Solenoid valve

PC-controlled via solenoid valve

Solenoid valve

Amount of heat transfer fluid

18

26

l

Temperature measurement:

Display accuracy at 250°C

± 0.5

± 0.5

°C

Spatial temperature gradient

± 0.1

± 0.1

°C

Temperature measurement resolution

0.1

0.1

°C

Heating rate

50, 120 or freely adjustable

50, 120 or freely adjustable

K/h

Display accuracy at 250°C

Spatial temperature gradient

Temperature measurement resolution

Heating rate

Travel measurement:

Measurement range

0 to 12.7

0 to 12.7

mm

Resolution

0.001

0.001

mm

Display accuracy

± 0.01

± 0.01

mm

Measurement range

Resolution

Display accuracy

Connection:

Power supply voltage

230/240

V

Power frequency

50/60

Hz

Power

2 000

2 000

W

Power supply voltage

Power frequency

Power

Coolant connection

for hoses with a 12 mm inner diameter

for hoses with a 12 mm inner diameter

Coolant temperature

+ 10

+ 10

°C

Instrument dimensions:

Height

460

460

mm

Width

440

550

mm

Depth

570

650

mm

Height

Width

Depth

Weight without accessories, approx.

40

kg

Mains

Voltage fluctuations

≤±10

≤±10

% with reference to the nominal power supply as quoted

Short term interference

≤20

≤20

ms

Frequency

±1

±1

% related to the nominal frequency as quoted

Ground

Ground resistance ≤5

Ground resistance ≤5

Voltage fluctuations

Short term interference

Frequency

Ground

  1. Can be increased to 6 measuring stations via retrofit

General technical data

Description

Value

General technical data for HDT/Vicat Standard instruments

Display accuracy at 250 °C

±0.5

°C

Spatial temperature gradient

±0.1

°C

Temperature measurement resolution

0.1

°C

Temperature sensor

Oil-bath temperature is measured by 1 temperature sensor.

Heating rate

50, 120 or freely adjustable

K/h

Displacement measurement with digital measuring transducers:

resolution

0.001

mm

display accuracy

±0.01

mm

Connection:

mains voltage

230/240

V

mains frequency

50/60

Hz

power rating

3460

W

water supply, max.

10

bar

PC interfaces required

  • 1x for temperature channel (RS)
  • 1x for displacement channel (RS)

Specimen data

VST specimen dimensions, max.

10 x 6.5 x 10

mm

HDT specimen dimensions, max.

13 x 15 x 130

mm

HDT spans

64, 100 and 101.6

mm

testXpert III Testing Software

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