Are 60 minute fire rated doorsets acceptable in a softwood frame?

Are 60 minute fire rated doorsets acceptable in a softwood frame? 

The quick answer is NO, the more detailed answer is below.

In practice it is virtually impossible for a 60 minute fire test using a softwood frame, to be successful, softwood burns/chars rapidly when compared to virtually all hardwoods. 

In most tests a dense hardwood is used, softwood would be accepatable if it could be supported by the appropriate test evidence.

 

                             Image of Interior Fire Door Frame, Type 1 for Single 1/2 Hour Fire Rated Doors, Made to Size with Fire & Smoke Seals and with or without threshold.

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Chippy