The composite material was first produced in the 1960s. Fiberglass reinforced polymer (FRP) was commercially recognized in the 1980s when it was used. https://www.tuf-bar.com/advantages-of-using-glass-fiber-reinforced-polymer-gfrp-rebar/
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fiber reinforced polymer rebar

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อัปโหลดแล้ว 6 ปี ก่อนหน้านี้ — 1956 จำนวนคนดู

The composite material was first produced in the 1960s. Fiberglass reinforced polymer (FRP) was commercially recognized in the 1980s when it was used. https://www.tuf-bar.com/advantages-of-using-glass-fiber-reinforced-polymer-gfrp-rebar/