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As per ASTM D - 1525 and ASTM D - 648 as well as ISO 306 and ISO 75 to determine vicat softening temperature and heat deflection temperature (heat distortion temperature) of polymers, compounds and engineering plastics.
International Equipments is a leading manufacturer, supplier and exporter of VSP / HDT Apparatus (Vicat Softening Point and Heat Deflection Temperature testing equipment) in India. Built at our Mumbai facility, our VSP / HDT Apparatus is a precision instrument that measures the two key thermal-property characteristics that together define the maximum service temperature of any thermoplastic material - Vicat Softening Point per ASTM D 1525 / ISO 306, and Heat Deflection Temperature per ASTM D 648 / ISO 75. Available in two variants - Computerised (2 or 6 stations) and Analogue (2 stations) - to suit different laboratory budgets and testing volumes.
Vicat Softening Point (VSP) and Heat Deflection Temperature (HDT, also called Heat Distortion Temperature) are the two most-referenced thermal properties on every polymer datasheet - they directly tell the engineer the maximum temperature at which a finished plastic part can perform its function without significant deformation. They are essential for material selection in automotive components, electrical and electronic housings, hot-water plumbing pipes (CPVC, PPR), engineering plastic parts, glass-filled composites and any application where the part will see elevated service temperature.
★ CLIENT USING THIS MODEL (Computerised)
As per ASTM D - 1525 and ASTM D - 648 as well as ISO 306 & ISO 75 to determine vicat softening temperature and heat deflection temperature of polymers, compounds & engineering plastics.
| Temperature Range | From ambient to 300°C |
| No. of Stations | Two |
| Material of Construction | Inner bath: S.S; Outer body: M.S |
| Rate of Heating | 120°C / hour and 50°C / hour |
| Dial Gauge | Range up to 10 mm, resolution 0.01 mm |
| Paint | Powder coated |
| Power | 230 Volts, 50Hz, single phase |
| Weights | 5 grams to 2000 grams for incremental loads |
A VSP / HDT Apparatus is a precision thermal-property testing instrument that determines the temperature at which a polymer specimen softens or deflects under a defined applied load - simulating, in a controlled laboratory environment, the heat-resistance failure mode a finished plastic part might experience in service. The instrument consists of a temperature-controlled oil bath, multiple test stations each holding a specimen under a calibrated weight, precision penetration/deflection sensors, and a programmable temperature ramp.
Two different test methods are performed on the same instrument - Vicat Softening Point (VSP) measures the temperature at which a flat-ended indenter penetrates 1 mm into the polymer surface; HDT measures the temperature at which a polymer bar specimen, loaded as a 3-point beam, deflects by a specified amount.
Our VSP / HDT Apparatus is purpose-built for the ASTM D 1525 / D 648 and ISO 306 / 75 test methods - not a generic heating bath adapted for the purpose. Stainless-steel inner bath ensures corrosion-free service; mild-steel powder-coated outer body for long service life. Programmable temperature ramp at either 50°C/hour or 120°C/hour covers the slow and fast ramp rates specified by the standards.
Multi-station design lets the laboratory test multiple specimens simultaneously. Our Computerised variant comes in 2-station and 6-station configurations; the Analogue variant comes in a 2-station configuration. Precision penetration/deflection sensor - range up to 10 mm with resolution of 0.01 mm - captures the specimen's dimensional response with the precision valid VSP and HDT results require. The standard supply includes a calibrated weight set from 5 grams to 2000 grams.
The Computerised variant is built with a dedicated microcontroller, digital penetration/deflection sensor, and PC connectivity for full data logging and printable reports. The Analogue variant uses a precision analogue dial gauge instead, well-suited for educational institutions and budget-constrained labs.
Contact International Equipments today for a personalised quotation. Tell us your polymer types, expected testing volume, station-count requirement (2 or 6), and variant preference (Computerised or Analogue) and the test standards you follow (ASTM D 1525 / D 648, ISO 306 / 75) - our team will share pricing, delivery timeline and the list of leading polymer producers, engineering plastic moulders and R&D institutions already using our VSP / HDT Apparatus.
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