what is the material called raex hsf 420 and it properties
 

what is the material called raex hsf 420 and it properties
i am analysing a 50m high self supporting tower made of steel sections of uv profiled with raex hsf 420. this tower is few years old and it necessary to check the stability for fixing few antennas more.
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from a google search it would appear to be a steel specification. there are some basic properties on page 11 of this publication. it's in finnish though.