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Handbook for Playground Safety <br />2.3.1 Equipment not recommended <br />Some playground equipment is not recommended for use on <br />public playgrounds, including: <br />• Trampolines <br />• Swinging gates <br />• Giant strides <br />• Climbing ropes that are not secured at both ends. <br />• Heavy metal swings (e.g., animal figures) — These are not <br />recommended because their heavy rigid metal framework <br />presents a risk of impact injury. <br />• Multiple occupancy swings — With the exception of tire <br />swings, swings that are intended for more than one user <br />are not recommended because their greater mass, as com- <br />pared to single occupancy swings, presents a risk of impact <br />injury. <br />• Rope swings — Free -swinging ropes that may fray or other- <br />wise form a loop are not recommended because they pre- <br />sent a potential strangulation hazard. <br />• Swinging dual exercise rings and trapeze bars — These are <br />rings and trapeze bars on long chains that are generally <br />considered to be items of athletic equipment and are not <br />recommended for public playgrounds. NOTE: The recom- <br />mendation against the use of exercise rings does not apply to <br />overhead hanging rings such as those used in a ring trek or ring <br />ladder (see Figure 7). <br />ICY <br />11/ <br />2.4 Surfacing <br />The surfacing under and <br />around playground equip- <br />ment is one of the most <br />important factors in reducing <br />the likelihood of life -threat- <br />ening head injuries. A fall <br />onto a shock absorbing sur- <br />face is less likely to cause a <br />serious head injury than a fall onto a hard surface. However, <br />some injuries from falls, including broken limbs, may occur <br />no matter what playground surfacing material is used. <br />The most widely used test method for evaluating the shock <br />absorbing properties of a playground surfacing material is to <br />drop an instrumented metal headform onto a sample of the <br />material and record the acceleration/time pulse during the <br />impact. Field and laboratory test methods are described in <br />ASTM F1292 Standard Specification for Impact Attenuation of <br />Surface Systems Under and Around Playground Equipment. <br />Testing using the methods described in ASTM F1292 will <br />provide a "critical height" rating of the surface. This height <br />can be considered as an approximation of the fall height <br />below which a life -threatening head injury would not be <br />expected to occur. Manufacturers and installers of play- <br />ground protective surfacing should provide the critical <br />height rating of their materials. This rating should be greater <br />than or equal to the fall height of the highest piece of equip- <br />ment on the playground. The fall height of a piece of equip- <br />ment is the distance between the highest designated play <br />surface on a piece of equipment and the protective surface <br />beneath it. Details for determining the highest designated <br />play surface and fall height on some types of equipment are <br />included in §5 Parts of the Playground. <br />2.4.1 Equipment not covered by protective <br />surfacing recommendations <br />The recommendations for protective surfacing do not apply <br />to equipment that requires a child to be standing or sitting at <br />ground level. Examples of such equipment are: <br />• Sand boxes <br />• Activity walls at ground level <br />• Play houses <br />• Any other equipment that children use when their feet <br />remain in contact with the ground surface <br />2.4.2 Selecting a surfacing material <br />There are two options available for surfacing public play- <br />grounds: unitary and loose -fill materials. A playground <br />should never be installed without protective surfacing of <br />some type. Concrete, asphalt, or other hard surfaces should <br />never be directly under playground equipment. Grass and <br />dirt are not considered protective surfacing because wear <br />and environmental factors can reduce their shock absorbing <br />effectiveness. Carpeting and mats are also not appropriate <br />unless they are tested to and comply with ASTM F1292. <br />Loose -fill should be avoided for playgrounds intended for <br />toddlers. <br />8 <br />