HSM-4 Laboratory Heat Sealer

For standard determination of heat sealability. Produces seals up to 50mm long x 5 to 25mm wide.


Precise control of heat sealing process variables (temperature, pressure, and dwell time), enables an optimal balance of material specification, packaging machine speed and seal integrity. Accuracy and repeatability in  laboratory heat seal testing is vital, and the HSM-4 provides a standard range of controls for this purpose.



  • Choose heat sealing bar configuration, either single (upper) or dual (upper & lower, meets ASTM F2029)
  • User can easily change sealing bar for various surface areas or surface finishes
  • Accurate and repeatable seals due to precision ground sealing faces and jaw guidance system
  • Versatile applications for flexible materials, blister packs and pots
  • Low Maintenance – 12 months between calibrations



  • Pressure calibration of standard surface area jaw face
  • Temperature digital controller, pressure and dwell time dial controllers
  • Jaws constructed in aluminum and silicon with precision ground faces
  • Range of jaw face surfaces including Matched Crimp and Teflon Coating


HSM-4 Laboratory Heat Sealer meets the following standard, click on the link to purchase the standard ASTM F2029

Read more about Heat Seal Parameters by downloading the white paper ‘Heat Seal Parameters of Flexible Polymer Film and Finished Pack Seal Integrity – Quality Control Issues’

RDM Laboratory Heat Sealers have set the standard in precision and reliability for over 30 years.


Download: Brochure HSM-4 Laboratory Heat Sealer


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