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surface material exposed to the atmosphere . Core is the material that surrounds and bonds to the <br /> fiberglass reinforcing rods . The use of separate materials for skin and core is at the discretion of <br /> In <br /> each manufacturer; however, if a single material is used, that material must meet the <br /> requirements for both skin and core . <br /> Manufacture Structural Plastic as one continuous piece with no joints or splices to the <br /> dimensions and tolerances in accordance with Table 3 . Interior voids shall not exceed 3 /4 inch in <br /> diameter. Structural Plastic shall be free of twist and curvature . <br /> Reinforce 10"x10 " fiberglass structurally reinforced composite lumber for use in heavy <br /> duty and medium duty fender systems with a minimum of four 1 1 /2 inch fiberglass reinforcing <br /> rods placed in the corners of the section . Reinforce 10"x10" fiberglass structurally reinforced <br /> composite lumber for use in light duty fender systems with a minimum of four 1 inch fiberglass <br /> reinforcing rods placed in the corners of the section . Reinforce 16 " O . D . Components including <br /> fiberglass structurally reinforced composite piles for use in heavy duty fender systems with a <br /> minimum of sixteen 1 1 /2 inch fiberglass reinforcing rods . Reinforce 16 " O . D . Components <br /> including fiberglass structurally reinforced composite piles for use in medium duty fender <br /> systems with a minimum of sixteen 1 inch fiberglass reinforcing rods . <br /> Reinforcing rods must be continuous and offer a minimum flexural strength of 70 . 0 ksi <br /> when tested in accordance with ASTM D 4476 and a minimum compressive strength of 40 . 0 ksi £ <br /> when tested in accordance with ASTM D 695 . Steel reinforcing rods are not permitted . <br /> Reject any sections of structural plastic containing cracks or splits . Also , inspect the ends <br /> of the reinforcing rods and reject any sections containing reinforcing rods with voids or cracks . <br /> Add a minimum of 15 % (by weight) chopped fiberglass reinforcement to the <br /> polyethylene used for fiberglass structurally reinforced composite lumber, a minimum of 5 % (by <br /> weight) chopped fiberglass reinforcement for components including fiberglass structurally <br /> reinforced composite piles and a minimum of 15 % (by weight) chopped fiberglass reinforcement in <br /> for smaller dimensional fiberglass fiber reinforced composite lumber. The fiberglass <br /> reinforcement may be reduced when other means of controlling cracking are specified with test <br /> results which show long term cracking is nonexistent . <br /> on Fiberglass structurally reinforced composite lumber must meet the minimum structural <br /> properties listed in Tables 4A and 4B . <br /> Smaller dimensional fiberglass fiber reinforced composite lumber must meet the <br /> minimum physical properties listed in Table 5 . <br /> Components including fiberglass structurally reinforced composite piles must meet the 1 <br /> structural properties listed in Tables 6A and 6B . <br /> Table 1 <br /> Plastic Material Properties - CP and SCL <br /> Density ASTM D792 Skin 55 - 63 pcf <br /> Density ASTM D792 Core 48 — 56 pcf <br /> Water Absorption ASTM D570 Skin 2 hrs : < 1 . 0% weight increase <br /> 24 hrs : <3 . 0 % weight increase <br /> Brittleness ASTM D746 Skin Brittleness temperature to be less <br /> than 40 deg . C <br /> Impact Resistance ASTM D256 Skin Greater than 0 . 55 ft- lbs/in <br /> Method A (Izod) <br /> Hardness ASTM D2240 Skin 44 - 75 ( Shore D) <br /> - 237 - <br /> FPID ( S ) : 423186 - 1 - 58 - 01 <br /> y <br />