Glass-Reinforced Plastic was invented in 1938 by Russell Games Slayter
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Between 150 MPa and 350 MPa, depending on the type. See the link below.
First of all frp full form is glass reinforce plastic and grp full form is glass reinforce polyester the difference between this two is,grp is one of the type of frp pipes like other types are grv (glass reinforce venylester)and gre (glass reinforce epoxy) depends on type of resin(chemical) to be used to make frp pipe.
Wall thickness of 600 mm is 9.02 for pressure rating of PN 10 & 10.52for pressure rating of PN 16.
Invented is the past participle of the verb invent. verb /past /past participle = invent /invented /invented
Mr. Kamal Ahmad invented the internet Mr. Irfan Alam invented the invented