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HALLITE SEALS

Hallite Seals International are an ISO 9001 accredited manufacturer and provider of Hydraulic Seals and sealing solutions to the global fluid power industry.

They operate in all five continents of the world and work with a number of major international brands. Hallite is renowned for their commitment to engineering excellence.

For over 100 years Hallite Seals International has been at the cutting edge of fluid power technology. They manufacture a wide range of rod piston static seas and bearing components. Hallite Seals International is at the forefront of technically challenging applications, from a wide range of materials which include Polytetrafluoroethylene PTFE Polyurethane AU nitrile rubbers NBR and Fluoroelastomers FKM. Seal & Design is proud to be a full line distributor.

hallite

The following information is provided to assist customers when selecting a Hallite seal for their application. If you need assistance choosing a Hallite product for your application feel free to contact us for assistance.  

 

HOUSING & INSTALLATION DATA

Hallite 87 & 506 Bearing Strip

Hallite 87 strip is a low friction PTFE & Bronze compound produced in a flat tape style ready for easy cutting to size to suit individual applications and is particularly effective in friction conscious applications such as servo cylinders.

Hallite 506 can be supplied in spiral lengths, generally in 10 meter, as individual cut bearings and also in 10 meter lengths packed flat in a box dispenser. Hallite 506 bearing strip is manufactured to extremely accurate thickness tolerances, ensuring reliable cylinder alignment. Other sizes of type 506 are available on request, special sections and diameters can also be produced to suit individual requirements.

 
Bearing Type Standard Material
87 PTFE + Bronze
506 Polyester + PTFE

Bearing Strip Housing Tolerances

As tolerances are not specified “on line” for Hallite Types 87 & 506, please refer to the information below for tolerances:

 
Hallite 506 Specified Tolerances (mm)
Bearing Length L1 Bearing
Cross Section S
-0.1 to -0.6 -0.02 to -0.1
Hallite 506 Specified Tolerances (in)
Bearing Length L1 Bearing
Cross Section S
-0.005 to -0.015 -0.001 to -0.004

HALLITE 87 & 506 SPECIFIED TOLERANCES

HALLITE 87 & 506 SHAFTS & BORES - METRIC

HALLITE 87 & 506 SHAFTS & BORES - INCH

HOUSING DESIGN

Hallite Seals’ product data sheets give information indicating the allowable extrusion gap a seal can see at pressure during its working life. The extrusion gap can be calculated using the tolerance build ups within the cylinder and any dilation that may occur under pressure. Maximum extrusion gap = F max (see drawing below). F max is the maximum extrusion gap for the seal Minimum metal to metal clearance = F min (see drawing below). F min for cylinders with minimal side loading should be > 0.1mm (0.004”).

Rods

InfoNote: Rod is not concentric with gland, because of clearances.
(shown exaggerated)

InfoNote: Piston is not concentric with cylinder bore, because of clearances.
(shown exaggerated)

Pistons

Calculate both F max and F min.
Ensure the F min is greater than 0.1mm (0.004”) and F max is less than the maximum extrusion gap stated on the seal data sheet at the application’s working pressure.

For built-in metal bearings, the extrusion gap calculation is simpler.

For F max:
Rod = ØD3 max – Ød1 min + dilation
Piston = ØD1max – Ød3 min + dilation

F min must be zero

Extrusion is closely linked to pressure and temperature. In general, the best seal performance and life is provided by specifying the smallest possible extrusion gap. The figures shown for the extrusion gap within the operating conditions of Hallite’s product data sheets, relate to the maximum permissible, worst case situation with the gap all on one side.

HOUSING DESIGN & SEAL OPTIONS

The following diagrams illustrate how Hallite’s wide range of products can be applied to a selection
of some of the most popular cylinder designs servicing the world’s fluid power industry.

The diagrams show different gland and piston arrangements to illustrate alternative sealing methods
currently in use and a suitable Hallite product.

If the application which you are interested in is of a non-standard nature please contact Hallite’s
technical department.

GENERAL RECOMMENDATIONS

We have found from many years experience, that premature seal failure can be avoided if the following recommendations are considered at the design and manufacturing stage of the cylinder:

  1. Specify piston and gland bearings which are adequately proportioned to support the cylinder loads. As a result of mounting misalignment and / or the working action of the cylinder, piston and gland bearings will be subjected to side-loading, causing damage to the rod or the tube surface and hence the seal, if the bearings are inadequate.
  2. Ensure that seals are stored distortion-free in a cool, dry and dark place prior to fitting.
  3. Check that the seal housing is free from damage likely to harm the seal. Remove all sharp edges and burrs from metal parts, paying particular attention to ports, grooves and threads over or through which the seal passes during assembly.
  4. Clean all seal housing areas, ensuring that all metallic particles and other contaminants have been removed. Check that other surfaces adjacent to the passage of the seal on fitting are also free of dirt, swarf or other contaminants. Check that both static and dynamic housing surface finishes meet specifications.
  5. Where the difference between a thread diameter over which the seal must pass and the seal diameter is small, use some form of protection over the thread, such as a fitting sleeve made of hard plastic.
  6. Check that the seal is of the correct type, part number and size, and that the specified material is correct. If there is any doubt regarding the material contact your local Hallite sales office.
  7. Lubricate all seals and metal components liberally with clean operating fluid or a compatible grease prior to assembly. N.B. Silicone grease should not be used in normal hydraulic applications.
  8. Where seals fitted to sub-assemblies, such as pistons, are awaiting further fitting operations, ensure that the seals are not subjected to any misaligned or localized loading which will cause local deformation. Ensure that sub-assemblies remain clean.
  9. The use of metal levers is not recommended but should they be used it is imperative that they are completely smooth and free from nicks and burrs. When using them ensure that the metal surfaces adjacent to the seal are not damaged.
  10. Flush the hydraulic system thoroughly before connecting the cylinder to it.

HALLITE FLUID COMPATIBILITY

Fluids based on mineral oilsGreasesFuels
MaterialContinuous material service temp. range °CIntermittent material service temp. range °CMotor OilsHypoid gear oilsAutomatic trans. fluidISO 6743-4 Hydraulic oils (HL, HM, HV)Mineral oil based greasesSilicon based greasesDiesel fuelFuel for gasoline, petrol engines – normalFuel for gasoline, petrol engines – super
+150 -40+150 -40+160 -50+100 -30+100 -30+250 -50
NBR 70 IRHD NBR 90 IRHD Nitrile (medium)+ 100 – 30+ 100 – 3010090100100100100***
FKM 75 IRHD FKM 90 IRHD Fluoro-elastomer+ 200 – 20+ 250 – 20150150160100100200150150150
EPDM 70 IRHD EPDM 80 IRHD+ 120 – 50+ 150 – 50NSNSNSNSNSNSNSNSNS
VMQ 70 IRHD Silicone+ 200 – 55+ 250 – 55****100*NSNSNS
HNBR 75 IRHD Hydrogenated nitrile+ 200 – 55+ 150 – 30130110130100100130***
IIR Butyl+ 120 – 40+ 140 – 40NSNSNSNSNS120NSNSNS
FFKM Perfluoroelastomer+300 +200 +40 -20150150160100100200150150150
AU Polyester PU+ 100 – 30+ 110 – 30100100100100100100606060
EU Polyether PU+ 100 – 40+ 110 – 45100100100100100100606060
Polyester elastomer+ 100 – 40+ 120 – 40100100100100100100606060
PA Polyamide+ 100 – 40+ 120 – 40100100100100100100100100100
POM Acetal+ 100 – 45+ 120 – 45100100100100100100100100100
PPS Polyphenylene sulphide+ 200 – 40+ 200 – 40150150160100100200150150150
PTFE Polytetrafluoroethylene+ 200 – 200+ 200 – 200150150160100100200150150150
Thermosetting polyester resin+ 100 – 50+ 130 – 200100100100100100100100100100
PEEK Polyetheretherketone+ 250 – 65+ 300 – 65150150160100100250150150150
* Denotes that values vary greatly for individual elastomers within this group NS Denotes that the elastomer is not suitable. The work of the BFPA technical working group ‘TC16/WG8’ in the compilation of this table is acknowledged.

HALLITE MATERIAL GUIDE

Material NameMaterial GroupDesignationTemperature °CTemperature °FHardnessColorRodPistonWiperBearing 
Nitrile - mediumSynthetic rubberNBR-30 +120-22 +25093 IRHDBlackH    
Nitrile - mediumSynthetic rubberNBR-30 +120-22 +25090 IRHDBlack  H  
Nitrile - highSynthetic rubberNBR-10 +140-14 +28480 IRHDBlackPPP  
Nitrile - lowSynthetic rubberNBR-45 +100 --45 +21280 IRHDBlack H   
Nitrile - mediumSynthetic rubberNBR-30 +120-22 +25078 IRHDBlack H  M1
Nitrile - mediumSynthetic rubberNBR-30 +120-22 +25075 IRHD BlackBlackHH   
Nitrile - mediumSynthetic rubberNBR-30 +120-22 +25073 IRHD BlackBlackHH   
Nitrile - mediumSynthetic rubberNBR-30 +120-22 +25070 IRHDBlackHH   
Nitrile - lowSynthetic rubberNBR-45 +100-45 +21270 IRHDBlackHH   
Nitrile - medium 407Synthetic rubberNBR-30 +120-22 +25070 IRHDBlack H   
Nitrile - low 407 LTSynthetic rubberNBR-56 +100-70 +21270 IRHDBlack H   
Nitrile - mediumSynthetic rubberNBR-30 +120-22 +25065 IRHDBlack H   
Hallprene -rubber/fabricCompositeCotton/NBR-30 +120-22 +250 BlackHH   
Fluoroelastomer - rubber/fabricCompositeCotton/FKM-20 +150-4 +302 BlackHH   
FluoroelastomerSynthetic rubberFKM-20 +200-4 +39275 IRHDBlackHPHPHP  
Hythane 181TPEEU-45 +110-50 +23093 IRHDBlueHPHPHP  
Hythane 282TPE -30 +125-22 +25593 IRHDPurpleHPHPHP M
PolyurethaneTPEAU-40 +100-40 +21294 IRHDDark BlueHHH  
PolyurethaneTPEAU-30 +100-22 +21293 IRHDDark Blue  H  
Standard polyester elastomerTPE -40 +120-40 +25055 DRed HH  
Hydrolysis stabilised polyester elastomerTPE -40 +120-40 +25055 DGreyHH  M
Hydrolysis stabilised polyester elastomerTPE -40 +140-40 +28472 DRed H  M
Lubricated stabilised polyester elastomerTPE -40 +120-40 +25055 DDark Brown HP   
AcetalEng. plasticPOM-45 +120-50 +250R 115OrangeHH HPM
PTFE glass filledEng. plasticPFTE-50 +200-58 +39260 DWhiteHPHP   
PTFE Glass / MoS2 filledEng. plasticPFTE-50 +200-58 +39262 DGreyHH H 
PTFE Bronze filledEng. plasticPFTE-50 +200-58 +39272 DBronzeHPHP HP 
Hallite 506 polyester / polyesterEng. plastic -40 +120-40 +250 Red   HPM
Nylon 12CompositePA-40 +120-40 +25072 DBrown H   
Nylon 6 / MoS2Eng. plasticPA-40 +120-40 +250R 115BlackHH   
Glass filled NylonEng. plasticPA-40 +120-40 +250R 124BlackHH H 
1 Static applications onlyH - Hydraulic,   P - Pneumatic
M - Suitable for water based fluids

HALLITE SEALS - Storage Guidelines

Most polymeric items including vulcanized rubber and other elastomers tend to change their properties during storage and may become unserviceable. This may be due to hardening, softening, cracking, crazing or other degradation and may be the result of oxygen, ozone, light, heat and/or humidity. Use the the following informational chart for most suitable conditions for storing elastomeric items, whether as a single item or composite product.

ENVIRONMENTAL FACTORS

Factor

Recommendations

Temperature

Storage temperatures should not exceed 75°F. Low temperatures are not permanently harmful provided the rubber items are handled carefully and not distorted. When taken from low temperatures items should be raised to approximately 85°F before they are used.

Humidity

Optimum humidity is about 65% in a draft-free atmosphere.

Light

Protection from direct sunlight and strong artificial light with a high ultraviolet content is important. Unless packed in opaque containers, it is advisable to cover windows with red or orange screens or coatings.

Oxygen and Ozone

Elastomeric items should be protected from circulating air wherever possible. As ozone is particularly harmful to rubber, storage rooms should be free from equipment that may give rise to electric sparks or discharge. Wrapping, storage in airtight containers or other suitable means should be used for vulcanised rubber items.

Deformation

Where possible, rubber items should be stored in a relaxed position, free from tension or compression. Laying the item flat and avoiding suspension or crushing keeps it free from strain and minimizes deformation.

Contact with Liquid and Semi-Solid Material

Contact with liquids and semi-solid materials, particularly solvents, such as oils or greases should be avoided unless so packed by the manufacturer.

Contact with Metals

Metals such as manganese, iron and copper, or copper alloys can have a harmful effect on rubber. A layer of paper, polyethylene or cellophane will keep these separated.

Contact with Non-Metals

Contact with other rubbers or creosotes should be avoided.

Stock Rotation

Elastomers should be stored for as short a period as possible, and strict stock rotation should be practiced