ASTM_F_2953_-_12.pdf

Designation:F295312Standard Specification forPhenolic Raw Materials for the Use in Bearing Cages1This standard is issued under the fixed designation F2953;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers basic characteristics requiredfor porous laminated phenolic materials intended for use asinstrument and thin-section ball-bearing retainers(cages)andthe methods of determining these characteristics.1.2 FormsSheets,rolled tubes,molded tubes,and rods arerecommended forms of laminated material covered by thisspecification.1.3 Intended UseMaterials produced to this specificationare intended for use as ball-bearing retainers(cages).Tempera-ture range is limited to 250F(117C)and below.1.4 UnitsThe values stated in inch-pound units are to beregarded as the standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD695 Test Method for Compressive Properties of RigidPlasticsD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 ANSI/ASQC Standard:3ANSI/ASQC Z1.4 Sampling Procedures and Tables for In-spection by Attributes2.3 Federal Standard:4MIL-STD-129 Military Making for Shipment and Storage3.Classification3.1 The material shall be furnished in the following typesand forms as specified:TypeDescriptionFBRolled tube made from cotton fabric weighing 4 oz/yd2(0.14 kg/m2)or less,with a nominal thread count of 80 by 80 threads per inch(31.5 by 31.5 cm).FBFWRolled tube made from cotton fabric weighing 4 oz/yd2(0.14 kg/m2)or less,with a nominal thread count of 100 by 100 threads per inch(39.4 by 39.4 cm).FBEFWRolled tube made from cotton fabric weighing 3 oz/yd2(0.1 kg/m2)orless,with a nominal thread count of 130 by 130 threads per inch(51.2 by 51.2 cm).4.Ordering Information4.1 Procurement documents should specify the following:4.1.1 Title,designation,and date of this specification;4.1.2 Type required(see Section 3);Property values fortubes(see Table 1);4.1.3 Dimensions required;and4.1.4 Special marking required(see 9.2).4.2 Required test data shall be requested at the time thepurchase order is submitted and listed on the purchase order.5.Order of Precedence5.1 In the event of a conflict between the text of thisspecification and references cited herein,the text of thisspecification takes precedence.Nothing in this specification,however,supersedes applicable laws and regulations unless aspecific exemption has been obtained.6.Performance Requirements6.1 Performance requirements for sheet laminated materialsshall be as specified in Table 2.6.2 TubesThe tubes shall consist of base material(rein-forcement)as described in 6.3 impregnated and bonded with anon-plasticized phenolic resin.Tubes will be made by passingthe impregnated material over heated rolls and winding the1This test method is under the jurisdiction of ASTM Committee F34 on RollingElement Bearings and is the direct responsibility of Subcommittee F34.06 onAerospace.Current edition approved June 1,2012.Published November 2012.DOI:10.1520/F295312.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American Society for Quality(ASQ),600 N.Plankinton Ave.,Milwaukee,WI 53203,http:/www.asq.org.4Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 heated material onto a mandrel while applying pressure to thematerial/mandrel.The overwrapped mandrel is then placed inan oven to cure the tube.6.3 Base Materials:6.3.1 Cotton Fabric ConstructionThe material shall con-sist of a woven cotton fabric substrate impregnated and bondedwith a phenolic resin matrix and processed to meet therequirements of this specification(see Table 3).Finished fabricshall be de-sized,washed,and bleached,with remainingimpurities per acetone extraction,not greater than 1.5%afterfinishing.See 8.5 for method of test.6.3.2 PaperType PB tubes shall be made from a