Fiber Glass Core PTFE Kevlar Gland Packing Description: 1. Fiber Glass Core PTFE Kevlar Gland Packing combines a fiberglass core with the heat resistanted Dupont's Kevlar fiber. Fiber Glass Core PTFE Kevlar Gland Packing Advantages: 1. Rugged 2. High heat resistance 3.Resists abrasion 4.Resists most acids and alkalis 5.Strong and durable 6.Can be used in abrasive service applications