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Polymer-sand hatches These hatches are not able to withstand heavy loads. Polymer-sand hatches consist of 70% sand. Such hatches are produced on the basis of polyester resin, various fillers and dyes. Reinforced with fiberglass to increase the strength of the hatch. These fairly durable products are well suited for installation in city parks and pedestrian areas. Polymer-composite hatches can withstand loads of up to 40 tons. The cost of these hatches is much lower than cast iron ones, but higher than plastic ones. Composite hatches, like plastic ones, are quite resistant to temperature changes and are easy to use.
