Product

PTFE Envelope Gasket

PTFE envelope gaskets combine chemical resistance with compliant filler support for process sealing duty.

High purity Low friction Custom machined

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Product Overview

Application and service highlights

Introduction

PTFE envelope gaskets combine a PTFE outer envelope with a resilient insert to provide corrosion resistance together with improved seating support. They are commonly applied on glass lined equipment and chemical service flanges where media compatibility is critical.

Key Features

PTFE envelope shields the insert from corrosive process media.
Suitable for glass lined and sensitive flange applications.
Improves sealing support where pure PTFE alone may not be preferred.

Specifications

Material, dimensions and testing standards

Material

Base Material: Virgin PTFE or engineered polymer grades based on application.
Options: Filled PTFE and high-performance engineering plastics available.
Finish: Supplied in moulded, extruded, skived or machined form.

Dimensions

Manufactured in standard stock sizes with cut-to-length options.
Thickness, OD and ID ranges available to suit application demands.
Custom machining supported for functional industrial components.

Testing

Batch inspection for surface finish and dimensional accuracy.
Material verification available on request.
Finished parts reviewed against order-specific tolerances.

Technical Drawing

Cross-sectional reference

Dimensional Specifications

Dimensional table

Size		Diameter (D)	Raised Face (R/F)	P.C.D (K)	Flange Thick. (T)	No. of Holes (N)	Hole Dia (B)	Lining Thickness (±0.5mm)	Length ± 5mm (Max L)
NB	Inch
25	1"	33.7	50	79	15	4	15	3	1000
40	1.5"	48.3	65	95	17	4	18	3	1000
50	2"	60.3	80	127	19	4	19	3	1000
80	3"	88.9	100	152	22	4	22	3	1000
100	4"	114.3	125	178	24	8	22	3	1000