Granuband Macon, LLC Macon , Missouri USA About Solutions products Companies Granuband Macon, LLC Products Playground Mulch Playground Mulch 0 Share Size: 3/8” – 5/8” ASTM certified. Following proper ASTM guidelines, rubber mulch is twice as safe as other playground material such as sand, gravel or wood mulch. Most popular related searches mulch mulching Customer reviews No reviews were found for Playground Mulch. Be the first to review! Add your review Publish your review Great! review successfully added!