EnduraflexTM RC611BNCured EnduraflexTM black, soft, cured natural rubber lining for chemical resistance, HCl service, sliding abrasion, field lining and repair. FDA compliant. For more information about this product, complete the form below or call 800-321-5583. Specs: Application: General Purpose, HCI Service, Sliding Abrasion Durometer: 55 to 70 A PDF Downloads: Spec Sheet (PDF) SDS (PDF) Notice: JavaScript is required for this content.