Compression Molded Grating
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 Rectangular compression-molded FRP gratings offer the best
available combination of strength, long life, and ease of
installation. The patented matched-die molding process uses heat
and pressure to form high-density grating panels that have higher
flexural impact strength and better chemical and UV resistance
than all other molded FRP gratings.
The strength of compression-molded grating results from the unique
way that reinforcing glass is used in making the grating. Metals,
Inc. compression molded grating is molded with continuous strands
of woven glass cording, for consistent strength throughout the
grating. Because it is compression molded, more reinforcing glass
can be used than is possible with conventional open-molded
gratings. Metals, Inc. gratings contain up to twice as much
fiberglass as ordinary FRP gratings. As a result,
compression-molded gratings are up to twice as strong, as can be
verified by comparing load/deflection data.
Given proper resin selection, all fiberglass gratings provide
acceptable corrosion protection compared to steel. But
compression-molding gives an extra measure of corrosion resistance
that other FRP gratings don’t have. The hydraulic pressure of
compression-molding forces glass deep into the resin, creating and
extra-dense grating that is less porous than conventional gratings
and therefore, less vulnerable to wicking.
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