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All Categories > Materials > Phenolics > Ryertex®- High Performance Phenolics > Ryertex® L Grade Bearings > Item # item-3358  

Item # item-3358, Ryertex® L Grade Bearings

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Ryertex® L - Linen is a fine weave cotton phenolic composite with 40% higher tensile strength than Grade C and is designed for tight tolerance fabrication and low moisture absorption.

Ryertex® L thermoset laminate is used in medium to heavy industrial applications for bearings, bushings and wear parts requiring tight tolerance fabrication.

  • Available in sheets, rods, tubes
  • Custom sizes available
  • Custom fabrication services available from WS Hampshire
  • MIL-I-24768/15
Applications
  • Mechanical grade
  • Line tooth gears
  • Radio parts
  • Terminal boards



Unit of Measure: Imperial Metric Both

Specifications  · Bearings Properties  · Installation  · Grade Description

Specifications

International Paper Micarta Grade
238


Bearings Properties

Wear Factor1

 View
720 x 10-10 in³.min/ft.lb.hr

Pressure Velocity (PV) Limit2

 View
27500

Coefficient of Friction (Static 40 psi)3

 View
0.29

Coefficient of Friction (Dynamic 40 psi, 50 fpm)4

 View
0.26
1 At 50 FPM, 40 psi
100-1003 Acceptable Wear Range
Oil, Grease, or water lubrication will change results dramatically, Micarta is Compatible with most types of lubricants.
2 Use test apparatus from D3702 at 100 FPM Increase
Oil, Grease, or water lubrication will change results dramatically, Micarta is Compatible with most types of lubricants.
3 Use test apparatus from D3702 - Static at 40 psi, 50 FPM
Oil, Grease, or water lubrication will change results dramatically, Micarta is Compatible with most types of lubricants.
4 Use test apparatus from D3702 - Static at 40 psi, 50 FPM
Oil, Grease, or water lubrication will change results dramatically, Micarta is Compatible with most types of lubricants.


Installation
    The resiliency of plastics permits bearings to be installed with a much larger interference fit than with metal bearings. However, part of the interference dimension causes a reduction in the ID size. This is compensated for in the "as machined" ID of the bearing.

    The OD of the Ryertex® and Nylon bearings is machined to 0.003" to 0.006" over the nominal 3 1/2" OD and 0.005" to 0.008" for larger sizes. This permits a press fit into a hole machined to the nominal size plus 0.001" minus 0.002". Due to the nature of plastics, changes in temperature and humidity may allow the bearings "as received" to have somewhat different tolerances than "as machined". If excessive interference fit (more than 0.008" for 3 1/2" OD and smaller or 0.010" for larger sizes) is found, the OD can be reduced by lightly sanding. Should the bearing be too loose, a bearing retaining compound, such as Locktite can be used. For Duralon the recommended press fit range is 0.0002" to 0.0022" and shouldn't exceed 0.007". A clearance fit of 0.0005" to 0.0015" is normally used between shaft and bearing ID. When installing, be sure the bearing is started square with the hole. Cutting a slight chamfer on the hold and the outside of the bearing is helpful. An arbor press is most desirable for press fitting although a hammer can be used if the end of the bearing is protected with a block of wood.


Grade Description
    Industry's fast thermo set composite bearing widely used for its ability to maintain high shock loads. S standard phenolic grades plus custom formulations Used with oil, games, or water lubrication.


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 DOWNLOADS 

Ryertex® L Grade Bearings - Data Sheet
(PDF, 36KB)

Technical Information
(PDF, 290KB)

Thermoset Properties
(PDF, 56KB)