frp pipe

1) Technically speaking - no difference, just nomenclature. FRP = Fibre (glass) reinforced plastic / GRP = Glass (fibre) reinforced plastic

2) RTRP is generally used for as a description for pipe, GRP is more generic, but technically no difference if you have GRP pipe. RTRP = Reinforced Thermosetting Resin Pipe / GRP = Glass (fibre) reinforced plastic.

There have been numerous ancronyms/abbreviations used over the last 60 or so years. Regardless of the many possible combinations, the most common and useful designation is simply "fiberglass pipe." This name encompasses all of the various available products and allows consideration as a unique and general class of engineering materials.

3) Please see the following sites for more detailed information, but in short - polyesters are the basic resin which are cheaper and easy to use and vinyl-esters are "premium" resins with higher corrosion resistance and temperature resistance.

http://www.fhwa.dot.gov/BRIDGE/frp/frp197.cfm

http://www.derakane.com