Laboratory Products

MARC Mineral Acid Digestion Heater Blocks

MARC designs and manufactures a range of flat plate or test tube acid digestion equipment specifically designed for both aggressive and mild mineral acid digestions.  All our digester’s surfaces are available in aluminium or PTFE-coated graphite and all equipment is designed to ensure acid ingress is minimized – thereby prolonging the equipment’s lifespan. All our digestion equipment is heavy duty and is designed and made for maximum life.  


  • Test Tube Digester Blocks for Aggressive Mineral Acid Environments – Anodised Aluminium or Graphite 

 We use 316SS for the body of the digester and the heater block itself is manufactured from aluminium and then anodised for additional chemical protection.  The heater block is also available in PTFE-coated graphite – which is recommended if metal contamination is a concern. The controller is detached from the main digester body so that it can be placed away from the fumes. 


The models in the table below are standard – however please feel free to request any variations.  Please note the digester blocks below are designed to heat aqueous samples at temperatures up to 185 deg C. For operator safety reasons – and to prolong element life – do not attempt to run the digester blocks at temperatures higher than 185 deg C.   At all times the draught-shield should be used to prevent user scalding and to prolong element life in a fume cupboard environment. 



Test Tube Config.

Temp Max.(deg C)


Body Stock Codes (240V /50 or 60Hz)
Anodised Aluminium Heater Block  

25mm Hole Depth

PTFE-Coated Graphite Heater Block  

55mm Hole Depth

16mm x 50 185 316SS 104446 189873
18mm x 50 185 316SS 104451 189875
20mm x 50 185 316SS 125434 189876
24mm x 50 185 316SS 125127 189863
16mm x 100 185 316SS 189871 189870
18mm x 100 185 316SS 125128 189869
20mm x 100 185 316SS 126183 189868
24mm x 100 185 316SS 189872 189862





  • Flat Digester Blocks for Aggressive Mineral Acid Environments – Available with Aluminium or PTFE-Coated Graphite Heating Surfaces for Heavy Acid Beaker Or Volumetric Flask digestions. These blocks are specifically designed to minimize acid ingress and so are extremely durable.  These blocks are designed for the digestion of acidified aqueous samples up to 185 deg C. This equipment is designed for use in a fume cupboard with 15A power outlets. 



Size (mm) Voltage (V) Max Temp (°C) Current Rating Heater Block Material Stock Code
610 x 500 220-240          

50 or 60 Hz

185 15A Anodized Aluminium 112776
PTFE- Coated Graphite 112846
610 x 300 15A Anodized Aluminium 112851
PTFE-Coated Graphite 112856