![]() The vessels were sealed and loaded into a CEM Mars 5 After sieving, the rubber powder was dried again overnight at 60 degreesĠ.2–0.15 gram quantities of the rubber powder were weighed into Teflon vessels and 10 Resulting rubber powder was sieved through a 0.84 mm sieve to remove largeįragments. Minutes at a rate of 10 cycles per second and after 6 minutes of cooling time. ![]() After drying, crumb rubber samples wereĬut into pea-sized pieces and pulverized in a Spex CertiPrep 6750 freezer mill for 6 Were then dried overnight at 60 degrees C. Samples were drained with filter paper, while coarser samples were decanted. The methods of testing were asĬrumb rubber samples were rinsed three times with deionized water. Taken from 9 different new bags of playground mulch. Infill from 5 different installers of fields and 9 different samples of rubber mulch Infill material from installers of synthetic turf fields. The rubber tire infill for synthetic turf fields was obtained as new Infill and the rubber tire playground mulch at Yale University. Methods used in the metal analysis of the crumb rubber tire synthetic turf What is supposedly the same products - showing no standardization at all. These are large variables due to the different samples of The cadmium levels in this analysis go from (mg/kg)Ġ.16 to 1.39 the lead levels go from (mg/kg) 2.6 to 33.1 and the zinc levels goįrom (g/kg) 8.8 to 22.2. It further casts doubt on studies of older fields where the crumb rubber has brokenĭown to dust over time and use. Of those "safety" studies in doubt because no two samples are necessarily the same. The wide variability of shredded waste tire mulch and crumb rubber infill throws all There is no standardization - and in fact the tires come from allĭifferent kinds of vehicles: trucks, both large and small, cars and as manyĭifferent kinds of tires as you can imagine. Tires that are collected from all over the country and then put into shredding Standardization in the shredded waste tires. Released from the various samples are very different, reflecting the lack of Present in, and presumably released from, the crumb rubber. RESULTSThe metal analysis conducted at Yale University shows that metals are There were 5 samples of infill from 5ĭifferent installers of fields and 9 different samples of rubber mulch taken from 9ĭifferent unopened bags of playground mulch. Material from installers of synthetic turf fields. The rubber tire infill for synthetic turf fields was obtained as new infill Manufacturer and were purchased in new bags of rubber mulch for use in gardens and The shredded rubber tire playground mulch samples tested were provided by the Findings of the metal analysis conducted by Yale University on the crumb rubber tire infill used in synthetic turf and the rubber tire mulch used as surfacing material in toddler playgrounds.
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