Pilotseal 550


PILOTSEAL 550 is a superior quality and performance biaxially orientated PTFE sheet material with a silica-based filler

PILOTSEAL 550 is a universal grade of filled PTFE suitable for many general applications. It is especially well suited for use with strong acids and alkalis, solvents, fuels, water, steam and chlorine.
PILOTSEAL 550 has very low gas permeability and excellent creep resistance properties.

Approvals and Compliance
BAM Oxygen service
BAM Chemical resistance against Ethylene Oxide
Conforms with FDA21 CFR 177.1550 regulations

Sizes Available
Thickness Range 0.75mm to 3.0mm
Standard Sheet Size 1.5m x 1.5m

Physical Properties

Tensile Strength
ASTM F152 15MPa
ASTM F36 7%
ASTM F36 40% Min
Residual Stress
DIN @ 175°C 32MPa
Creep Relaxation
ASTM F38 23%
Gas Permeability
DIN 3535 <0.01cc/min
Liquid Leakage
ASTM F37 0.21ml/hr

PTFE Design

Beldam Crossley can create PTFE products to your specification, creating a product with the correct PTFE grade material that works best for your application.

Contact our team of design engineers with your requirements and see how we can help you.


Beldam Crossley has been moulding PTFE for over half a century. We have since developed a wide range of High Performance Crossflon® materials, each suited to a specific application.

Pilotseal 550