Fiberglass pultruded grating 38mm I-bar 60% open rate, fire-resistant, UV protection ... Resin:Ortho Polyester (GP), Iso polyester (ISO), Vinyl ester (VE), PhenolicThickness:25mm, 38mm, 50mmLoading Bar type: T- ... bar, I-barOpen rate: 33%, 40%, 50%, 60%Panel size: ... design and technical request. fiberglass pultrusion grating, I-bar 38mm, 60% open rate