Braided PTFE packing T4903

aramid fiberchemical-resistanthigh resistance

Product overview
ULMAN T4903 is a gland packing manufactured from polyimide yarn reinforced with aramid staple fibres and highly impregnated with PTFE dispersion and silicone oil lubricant. The structure and impregnation deliver excellent abrasion, cut and wear resistance, high thermal and chemical stability, and reliable emergency running behaviour (material carbonises rather than melts). Designed for continuous service up to +260 °C; decomposition begins at approx. 450 °C.

Applications

• Chemical industry: acids, alkalis, solvents
• Energy and power plants: steam, condensate, hot and cold water
• Food and pharmaceutical industry
• General plant engineering: oils, greases, ammonia, lime milk

Fields of application

• Static
• Dynamic
• Single acting
• Double acting
• Linear
• Rotating
• Oscillating

Main use
High-strength fibre structure combined with a high degree of PTFE impregnation makes ULMAN T4903 particularly suitable for abrasive environments and for applications requiring pressure stability and long service life under varying process conditions.

Materials
Polyimide yarn (with aramid staple fibre), PTFE dispersion, silicone oil lubricant.

Technical values
Pressure: 30 dyn. / 350 stat.
Temperature: -100 °C to +260 °C (continuous); decomposition begins at ≈450 °C (carbonises)
Speed: up to 25 m/s
pH range: 1 - 12
Specific density: 1.4 g/cm³ ± 10%

Delivery forms
Square cross-section 4–25 mm (other dimensions on request)
Packaging weights by cross-section:

• up to 08 mm – 1 kg
• up to 12 mm – 2 kg
• up to 16 mm – 4 kg
• up to 25 mm – 5 kg

Downloads
General product datasheet available for ULMAN T4903.