Microwave Muffle Furnace

Ash Analysis made Rapid and Simple



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

CEM - Much faster than traditional muffle furnaces.


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

CEM - Safety


The Phoenix provides the unique ability to put your samples into the furnace at room temperature. This protects the operator from rapid sample decomposition upon initial placement that can result in danger- ous flames and heat. This is due to the ability of the Phoenix to rapidly increase the furnace temperature after the method is started.

CEM - Ease-of-Use


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.

CEM - Energy Savings

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.

CEM - Energy Savings

Phoenix meets the requirements of “electrically heated” and “microwave heated” muffle furnaces.

Phoenix satisfies the equipment requirements for “electrically heated” furnaces in the following methods: ASTM, USP (281 - ROI & 733-LOI), AOAC, FDA, ISO & DIN. Phoenix also meets the requirements for applications listing a “microwave heated” furnace such as ASTM D5630-94, ASTM D1506-94b.

Temperature verification and temperature calibration for ISO and GLP practices are quickly and easily performed with optional accessories,including NIST traceable dual thermocouples and calibration source instruments.


CEM - Sulfated Ashing Option

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.

CEM - AirWave Option

AirWave Option

AirWaveTM 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.

CEM - High Temperature Furnace Setup

High Temperature Furnace Setup

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

High Capacity Furnace Setup

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


Ashing Solutions for Every Industry

CEM has been providing customers with faster, safer, easier ashing for nearly 40 years. Whether you are measuring ash in plastics, paper, petrochemicals or petfood, we can help you do it better. Here are some examples of sample types our customers analyze.
CEM - Plastics


  • Adhesives
  • Polyethylene
  • Carbon Black
  • Polypropylene
  • Fiberglass
  • Polystyrene
  • Graphite Powder
  • Polysulfone
  • Hexamine
  • PTFE
  • Nylon
  • Silicon Carbide
CEM - Petroleum


  • Kerosene
  • Rubber
  • Motor Oil
  • Sludge
  • Phenolic resins
CEM - Pharmaceuticals/ Chemicals

Pharmaceuticals/ Chemicals

  • Ink
  • Organic Solutions
  • Lime
  • Silicon Carbide
  • Metal Stearates
  • Silver Powder
  • Nicotinamide
  • Thiabendazole
  • Nystatin
  • Titanium Dioxide
CEM - Food/Feeds


  • Beef
  • Noodle Mix
  • Cat Food
  • Oils
  • Dog Food
  • Rice (Germ & Bran)
  • Eggs
  • Salt
  • Feeds
  • Starch
  • Flour
  • Sugar
  • Lactose
  • Whey
  • Milk Powder
CEM - Pulp/Paper


  • Bagasse
  • Licorice extract
  • Biomass
  • Lignin
  • Ethyl cellulose
  • Sawdust
  • Hardwood
  • Wood Chips
  • Hydroxypropylcellulose
  • Wood (Pine)

Quartz Fiber Crucibles

CEM - Quartz Fiber Crucibles


The quartz fiber crucible design allows air to circulate within the sample, cutting test times to as low as 15 minutes.


Crucibles cool to the touch within seconds, reducing the risk of burns significantly compared to ceramic crucibles.


The crucibles cool almost instantly. They can be weighed immediately after ashing without long cooling times or the need for desiccation.