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Ash samples with unmatched speed, safety, ease-of-use, and energy savings with the Phoenix™ Microwave Muffle Furnace. This system will help improve your process control, allow for rapid adjustments, and reduce out-of-specification products. This system can perform many high temperature applications up to 97% faster than traditional muffle furnaces.


  • Up to 10 times faster than conventional muffle furnaces
  • Ash up to 15 samples at one time
  • Use any type of crucible normally used in conventional ashing systems, even platinum
  • Meets requirements of electrical and microwave muffle furnaces

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Much Faster than Traditional Muffle Furnaces

The Phoenix Microwave Muffle Furnace performs many high temperature applications up to 97% faster than traditional Muffle Furnaces. This provides more time to make adjustments to processes and reduce out of specification products

View Sample Ashing Times



Phoenix Safety


  • Place samples into the furnace at room temperature due to the Phoenix’s unique ability to rapidly heat and cool the furnace (protection from rapid sample decomposition and dangerous flames / heat).
  • Closed exhaust air system which minimizes contact with toxic or corrosive exhaust gases.
  • No external hot surfaces prevents risk of injury.
  • CEM’s rapid cooling crucibles prevent potential for injury upon furnace removal.
  • Integrated safety switches which monitor and prevent overheating.
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Conventional muffle furnaces are kept hot and therefore often require an initial “pre-burn” step to avoid excessive initial burning of the sample. This is typically done with the use of a Bunsen burner which requires extra effort and time. With the Phoenix, the sample can be inserted at room temperature with a rapid temperature ramping that eliminates the need for a “pre-burn” step. This significantly simplifies the work flow.

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Energy Savings

Due to the unique temperature ramping capabilities of the Phoenix system, it can be left idle in a non-heated state. This results in significant energy savings versus conventional muffle furnaces that are kept constantly in a high temperature state.

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Phoenix Meets the Requirements of “electrically heated” and “microwave heated” Muffle Furnaces

ASTM D874-92 - Sulfated Ash content of Lubricating Oils

ASTM D482-91 - Dry Ashing Petroleum Samples

ASTM D5630-94 - Ash content of Thermoplastics

ASTM D1506-94b - Ash content of Carbon black

IP 501 - Fuel oil sample prep by Ashing

USP 281 - Residue on Ignition (ROI)/Sulfated Ash

USP 733 - Loss on Ignition (LOI)

As well as various AOAC, FDA, ISO, and DIN methods



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Sulfated Ashing Option

This Vapor Scrubbing System features a vapor scrubber to safely remove harmful fumes from the furnace cavity and neutralize any residual acid exhausted (sulfur dioxide and nitric acid). This setup meets ISO 14000 regulations and can be rapidly disconnected in less than 5 minutes without the use of tools.

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AirWave Option

AirWave™ provides increased airflow for high organic sample ashing. This system configuration meets the most demanding requirements of large organic samples with ease and eliminates volume reduction/ carbonization on hot plate or Bunsen burner. The compressed air driven exhaust system features no moving parts and will not require excessive maintenance or clog.

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High Temperature Furnace Setup

The High Temperature Furnace holds up to 8 (20 or 50 mL) crucibles up to 1,200° C.

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High Capacity Furnace Setup

The High Capacity Furnace holds up to 15 (20 or 50 mL) crucibles up to 1,000° C




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  • Adhesives
  • Polyethylene
  • Carbon Black
  • Polypropylene
  • Fiberglass
  • Polystyrene
  • Graphite Powder
  • Polysulfone
  • Hexamine
  • PTFE
  • Nylon
  • Silicon Carbide
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  • Kerosene
  • Rubber
  • Motor Oil
  • Sludge
  • Phenolic resins
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  • Ink
  • Organic Solutions
  • Lime
  • Silicon Carbide
  • Metal Stearates
  • Silver Powder
  • Nicotinamide
  • Thiabendazole
  • Nystatin
  • Titanium Dioxide

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  • Beef
  • Noodle Mix
  • Cat Food
  • Oils
  • Dog Food
  • Rice (Germ & Bran)
  • Eggs
  • Salt
  • Feeds
  • Starch
  • Flour
  • Sugar
  • Lactose
  • Whey
  • Milk Powder
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  • Bagasse
  • Licorice extract
  • Biomass
  • Lignin
  • Ethyl cellulose
  • Sawdust
  • Hardwood
  • Wood Chips
  • Hydroxypropylcellulose
  • Wood (Pine)

  • Videos

    Quartz Fiber Crucibles
    Learn about CEM's unique patented Quartz Fiber Crucibles

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    Ashing under Inert Gas

    Useful for plastics and rubbers for the determination of soot or carbon content

    Oxygen Free Ashing

    Useful for carbon black determination in polyethylene and polypropylene