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Designation: D4731 − 13 (Reapproved 2020)Standard Specif i cation forHot-Application Filling Compounds for TelecommunicationsWire and Cable 1This standard is issued under the f i xed designation D4731; 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 specif i cation covers a variety of petroleum-basedand other compounds used for f i lling the air spaces in telecom-munications wires and cables (both electrical and f i ber optic)for the purpose of preventing water and other undesirable f l uidsfrom entering or migrating through the cable structure. (Forrelated standards see Specif i cations D4730 and D4732).1.2 A hot-application compound is a material that requiresmelting in order to be applied as a liquid and its melting pointaffects its performance in the f i nished cable product.1.3 The values stated in SI units are to be regarded asstandard. The values given in parentheses after SI units areprovided for information only and are not considered standard.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2D6 Test Method for Loss on Heating of Oil and AsphalticCompoundsD92 Test Method for Flash and Fire Points by ClevelandOpen Cup TesterD97 Test Method for Pour Point of Petroleum ProductsD127 Test Method for Drop Melting Point of PetroleumWax, Including PetrolatumD150 Test Methods for AC Loss Characteristics and Permit-tivity (Dielectric Constant) of Solid Electrical InsulationD257 Test Methods for DC Resistance or Conductance ofInsulating MaterialsD445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids (and Calculation of Dynamic Viscos-ity)D938 Test Method for Congealing Point of PetroleumWaxes, Including PetrolatumD1500 Test Method for ASTM Color of Petroleum Products(ASTM Color Scale)D2161 Practice for Conversion of Kinematic Viscosity toSaybolt Universal Viscosity or to Saybolt Furol ViscosityD3895 Test Method for Oxidative-Induction Time of Poly-olef i ns by Differential Scanning CalorimetryD3954 Test Method for Dropping Point of WaxesD4565 Test Methods for Physical and Environmental Per-formance Properties of Insulations and Jackets for Tele-communications Wire and CableD4568 Test Methods for Evaluating Compatibility BetweenCable Filling and Flooding Compounds and Polyolef i nWire and Cable MaterialsD4730 Specif i cation for Flooding Compounds for Telecom-munications Wire and CableD4732 Specif i cation for Cool-Application Filling Com-pounds for Telecommunications Wire and CableD4872 Test Method for Dielectric Testing of Wire and CableFilling Compounds3. Terminology3.1 Def i nitions of Terms Specif i c to This Standard:3.1.1 f i lling material, n—any of several materials used to f i llthe air spaces in the cores of multi-conductor insulated wiresand cables, or between buffer tubes covering optical f i bers, orwithin such buffer tubes, or any combination of these conf i gu-rations and any other cable components, for the purpose ofexcluding water and other undesirable f l uids; especially withregard to telecommunications wire and cable, including opticalcable, intended for outside aerial, buried, or undergroundinstallations.3.1.2 producer, n—the primary manufacturer of the mate-rial.3.1.3 suppliers, n—jobbers and distributors as distinct fromproducers.1 This specif i cation is under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Electrical Insulating Materials. Subcommittee D02.10contributed in the development of this standard.Current edition approved Aug. 1, 2020. Published September 2020. Originallyapproved in 1987. Last previous edition approved in 2013 as D4731 – 13. DOI:10.1520/D4731-13R20.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1