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material consists of shredded wood into sizes and aspect ratios determined by a series of specified sieves. The wood chips are springy enough to meet ASTM F1292 for impact attenuation and firm enough to meet ASTM F1951 for wheelchair access. Engineered wood fiber is made from biodegradable virgin wood. A wood fiber surface tends to compact over time and needs to be topped off every two to three years.
*Poured rubber surfacing: This is a seamless rubber surface composed of two layers that is poured in place (PIP). The first layer, or "wear

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