ASTM C578-19 - 1.6.2019
1. Scope

1.1 This specification2 covers the types, physical properties, and dimensions of cellular polystyrene boards with or without facings or coatings made by molding (EPS) or extrusion (XPS) of expandable polystyrene. Products manufactured to this specification are intended for use as thermal insulation for temperatures from –65 to +165°F (–53.9 to +73.9°C). This specification does not apply to laminated products manufactured with any type of rigid board facer including fiberboard, perlite board, gypsum board, or oriented strand board.

1.1.1 Additional requirements for Types IV and XIII for pipe, tank, and equipment thermal insulation for temperatures from –320 to +165°F (–196 to +73.9°C) are contained in Annex A1.

1.2 The use of thermal insulation materials covered by this specification is potentially regulated by codes that address fire performance. For some end uses, specifiers need to also address the effect of moisture and wind pressure resistance. Guidelines regarding these end use considerations are included in Appendix X1.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2. Referenced Documents


Terminology of Fire Standards


Test Method for Compressive Properties of Rigid Cellular Plastics


Test Method for Apparent Density of Rigid Cellular Plastics


Test Method for Response of Rigid Cellular Plastics to Thermal and Humid Aging


Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index)


Test Method for Measuring Compressive Properties of Thermal Insulations


Terminology Relating to Thermal Insulation


Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus


Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation


Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions


Test Method for Dimensions and Density of Preformed Block and BoardType Thermal Insulation


Test Method for Characterizing the Effect of Exposure to Environmental Cycling on Thermal Performance of Insulation Products


Terminology for Abbreviated Terms Relating to Plastics


Test Methods for Water Vapor Transmission of Materials


Test Method for Surface Burning Characteristics of Building Materials


Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation


Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus


Test Method for Steady-State Heat Transfer Properties of Pipe Insulation


Practice for Sampling and Acceptance of Thermal Insulation Lots


Test Method for Steady-State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus


Test Method for Measuring Trueness and Squareness of Rigid Block and Board Thermal Insulation


Practice for Conditioning of Thermal Insulating Materials


Practice for Calculating Thermal Transmission Properties Under Steady-State Conditions


Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation


Test Method for Steady-State Thermal Transmission Properties by Means of the Thin-Heater Apparatus


Standard Test Method for the Determination of Long-Term Thermal Resistance of Closed-Cell Thermal Insulating Foams