Braided graphite packing T4938

aramid yarnPTFEchemical-resistant

Overview
ULMAN T4938 is manufactured from PTFE yarn with a high graphite content and a special lubricant impregnation. Edges are reinforced with aramid yarn to permit use under very high pressures, especially in piston pumps. The packing features a compact cross-section and a robust structure, providing high resistance to splitting and wear while protecting against mechanical stress from abrasive media.

Application
T4938 is intended for sealing pumps, valves, and slide gates. It is suitable for universal use up to approx. +280 °C and provides reliable sealing in chemically aggressive media as well as in water and steam.

Fields of application

• static
• dynamic
• single acting
• double acting
• linear
• rotating
• oscillating

Materials
PTFE yarn; PTFE/graphite combination.

Delivery forms

• 6–25 mm square (other dimensions available on request)
• Specific density: 1.35 g/cm³ ± 10%
• up to 08 mm – 1 kg
• up to 12 mm – 2 kg
• up to 16 mm – 4 kg
• up to 25 mm – 5 kg

Technical specifications

• Model: T4938
• Material: PTFE yarn with high graphite content (PTFE/Graphite)
• Edge reinforcement: Aramid yarn (aramid fiber corner reinforcement)
• Pressure: 30 dyn. / 250 stat.
• Temperature range: -150 °C to +280 °C
• Speed: 25 m/s
• pH range: 1 - 13
• Main use: Sealing pumps, valves, and slide gates
• Key properties: Compact cross-section, robust structure, high resistance to splitting and wear, protection against abrasive mechanical stress
• Delivery & weights: 6–25 mm square; specific densities and package weights as listed above