HSG-3 & 5 Gradient Heat Sealers

For rapid determination of heat sealability of flexible packaging. Produces 3 or 5 independently temperature controlled seals, up to 15mm wide x 30mm long.


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 HSG Gradient provides precision digital controls for this purpose. Fitted with either 3 or 5 sets of sealing bars with individual temperature controls to create a temperature gradient across the film.


  • 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



  • Precise pressure calibration of standard surface area jaw face
  • Temperature, pressure and dwell time digital controllers
  • Jaws constructed in aluminum and silicon with precision ground faces
  • Range of jaw face surfaces including Matched Crimp and Teflon Coating
  • Auto cycle feature for greater user convenience with multiple samples

HSG Gradient 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 HSG-3 & 5 Gradient Heat Sealers