PTFE Piston Seals and Rod Seals Type Memory Packings

Memory packings are single acting sealing elements used in pneumatic applications primarily to seal reciprocating pistons and rods.  

In unlubricated applications,  dry running rod seals and dry running piston seals require  PTFE compounds with advanced filler combinations to ensure maximum performance and lifetime is achieved. 

Combining this with the unique Memory Packings design produces a  high efficiency system with extremely low friction which can be elegantly packaged into many types of light weight and portable equipment. 

A standard range of symmetrical EMS packings are available for both rod and piston applications whist EMT and EMTX seals are ideally suited to and extensively used in rocking piston pump applications.

Standard Type EMS | Memory Packings

PTFE Seals: Memory packings Standard EMS

EMS – PTFE Piston and Rod Seal; and as  PTFE Shaft Seal

Operating limits
T = –40°C to +220°C
p = up to 20 bar
v = 15 m/s ⇔
v = 1 m/s

Stock Range, Standard Dimensions,
Basic Type: EMS

Ordering example: EMS – 12 x 6 x 3.6 – HS 21029
EMS = type
12 = hole Ø
6 = rod Ø
3.6 = groove width
HS 21029 = standard material PTFE special compound HS 21029; the advanced second-generation compound is HS 21059.

Dimension table

Hole ∅Rod ∅Groove depthGroove widthPart no.
AH9Bf7TG+0.2
12633.6386.480
13733.6206.070
14833.6403.687
161033.6785.881
181233.6785.903
191333.6210.030
201433.6785.911
221633.6785.938
241833.6786.012
251933.6786.765
262033.6092.100
282045.0785.954
302245.0786.020
322445.0785.962
332545.0786.039
362845.0786.047
383045.0787.515
403245.0785.970
443645.0786.055
504056.3785.989
554556.3403.970
605056.3785.997
635356.3786.004
665656.3780.960
706056.3090.980
736356.3840.327
807056.3786.063
1008867.5786.071
11210067.5840.173*
12511367.5385.743*

Special dimensions and other compounds available on request.

Additional Types

PTFE Seal: EMT Piston Seal Cub packing

EMT – PTFE Piston Seal

Cup packing.

PTFE Seal: EMH rod seal Cap Packing

EMH – PTFE Rod Seal | Wiper | Shaft Seal

Cap packing.

PTFE Seal: EMTX Piston Seal Cup Packing with Integrated Guide

EMTX – PTFE Piston Seal

Cup packing with integrated guide.

PTFE Seal: EMHX rod seal Cap Packing with integrated Guide

EMHX –PTFE Rod Seal | Wiper | Shaft Seal

Cap packing with integrated guide.

PTFE Seals: Complete Piston Double Acting with Guide

Complete Piston

Double-acting with guide.

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For further info

please contact us:

ElringKlinger Engineered Plastics
Headquarter Germany Bietigheim-Bissingen
Phone: +49 (0)7142 583-0
E-mail: sales.ekt(at)elringklinger.com