TESTIMONIAL:

April 9, 1999

To Whom It May Concern:

     After testing a cryogenic treatment of cutting tools treated by the Metal Finishing Co., MFCO, we have now started implementing usage of these cutters and inserts throughout our metal finishing processes.

     Our tests showed a dramatic increase in cutter / tool life when using tools that were cryogenically treated. During our first tests, we found that when A6 tool steel, with a hardness of RC 55-58 was treated cryogenically, the life span of the tools increased from one tool tip per part to a rate of 3 to 10 parts for each tool tip used.

     Our next test used 3/4" end mills while milling 4340 grade steel with a hardness of RC 56. The end mills that had been cryogenically treated lasted from 3 to 6 times longer than untreated tools.

     In summary, it is necessary to say that I feel substantial savings, in both man hours and cost of tools, can be accomplished utilizing the cryogenic treatment method provided by the industry.

Sincerely,

David L. Gilbert
Maintenance Machinist Lead

Boeing
Commercial Airplane Division
Facilities Maintenance Organization
Wichita, Kansas