HTT-01 Hot Tack Tester

Hot tack is the property of a heat sealed layer to resist forces that would pull the seal apart while it is still hot. This property is of vial importance for veritcal form fill and seal process(VFFS). HTT-01 Hot Tack Tester measures the strength of heat seals formed between thermoplastic surfaces immediately after the seal has been made and before it cools to room temperature.
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Hot tack is the property of a heat sealed layer to resist forces that would pull the seal apart while it is still hot. This property is of vial importance for veritcal form fill and seal process(VFFS).

HTT-02 Hot Tack Tester measures the strength of heat seals formed between thermoplastic surfaces immediately after the seal has been made and before it cools to room temperature.

Test Principle

A sample strip is sealed by applying pressure from two flat heated jaws under defined conditions of temperatures, contact time, cooling time and pressure.

Technical Features

● Zeroing at any position to facilitate differential measurement
● With ON/OFF switch key, or automatic power off  
● Measurement unit can be converted between mm and in

HTT-02 Hot Tack Tester is a PLC controlled unit(industrial level stable) and HMI touch screen operated. Every part of the dart assembly and releasing mechanism are made strictly to standard.


  • 1. Both Method A and Method B described in ASTM F1921
  • 2. P.I.D. temperature control
  • 3. 7 inch HMI touching screen operation
  • 4. PLC control inside
  • 5. Aluminum encapsulated sealing jaws
  • 6. Auto zeroing, overload and over travel protection
  • 7. Test speed 200cm/min, 1200cm/min or others


Key Parameters

Item  Parameters
Sealing Temperature Ambient~250℃
Temperature Accuracy ±0.2
Heat Seal Dwell Time 0.1~9999S
Hot Tack Dwell Time 0.1~9999S
Sealing Pressure 0.1MPa~0.7MPa
Sealing Jaws 50mm*10mm Teflon Coated
Sealing Jaws Heating    Doube Heating
Load Cell  200N(Optional: 30N,50N,100N,500N
Accuracy 0.5 F.S.
Resolution 0.01N



ASTM F1921 Standard Test Method for Hot Seal Strength (Hot Tack) of Thermoplastic Polymers and Blends Comprising the Sealing Surfaces of Flexible Webs


Hot tack tester with tensile function and peeling 

Hot tack weight method

Hot tack and Heat sealer combined 



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