QBlock Series
Digestion Block for Acid Digestion

QBlock series digestion systems provide a wide range of volume and capacity options including customization. The PTFE-coated graphite block and enclosure ensures contamination free results. The life span of the system is dramatically increased by removing the electronics from the acid environment and placing them outside of the fume hood.

QBlock is compliant and perfect for many US EPA methods including 200.2, 200.7, 200.8, 245.1, 3050A, 3050B and SW 846 (7470A, 7471B), pre and post microwave digestion treatment and may also be upgraded to the Vulcan automated digestion system.

QBlock: Hotblock for sample digestion

QBlock Offers...

  • PTFE-coated graphite or anodized aluminum heating blocks
  • Fast and uniform heating from Ambient up to 400°C
  • Excellent temperature uniformity of +/- 1 °C
  • Thermally secured from 5 sides to conserve energy
  • Remotely placed electronics controls
  • Chemical and acid resistant housing of either PTFE-coated metal or engineered plastic
  • Only digestion block on the market that reaches adequate temperatures for tri-acid treatment
  • PTFE-coated sample vial carrying tray
  • Upgradable to Vulcan automated digestion and work-up system


Standard Size:  
33 X 30 X 15 cm (13.125” X 11.5” X 5.875”)
Large Size:  42 X 36 X 15 cm (16.5” X 14.0” X 5.875”)
Heating Range:  180 °C, 230 °C and 400 °C
Standard Size Large Size
Vial Volume Vial OD Sample Capacity Vial Volume Vial OD Sample Capacity

15 ml

16 mm
96(12 X 8)
- - -

25 ml

22 mm 72 ( 9 X 8) - - -

50 ml

30 mm 42 ( 7 X 6) 50 ml 30 mm 72 (9 x 8)

100 ml

45 mm 20 (5 x 4) 100 ml 45 mm 30 (6 x 5)


Do you have unique vial and temperature requirements?
Questron will design and manufacture customized block digestion systems for your applications. Contact us for a quotation on your customized heating block requirement

Customization Examples include:
  • QBlock for non-conventional glassware and microwave digestion vessels
  • QBlock with a heating range up to 500°C
  • High power blocks for faster heating
  • Specialized sample racks which can placed on QBlock to accommodate glass test tubes