Marflex HB50HTBromobutyl MarflexTM black, bromobutyl lining with superior temperature resistance to acids and caustic solutions up to 260°F (127°C). With tie gum. FDA compliant. For more information about this product, complete the form below or call 800-321-5583. Specs: Application: Acids and Caustic Solutions Durometer: 55 to 65 A PDF Downloads: Spec Sheet (PDF) SDS (PDF) Notice: JavaScript is required for this content.