ASTM C1058/C1058M-10 (2023) PDF

Full title and description

ASTM C1058/C1058M-10 (2023) — Standard Practice for Selecting Temperatures for Evaluating and Reporting Thermal Properties of Thermal Insulation. This practice establishes standard mean temperatures and recommended reporting conventions for thermal-property measurements of insulation materials, products, and related systems, and directs which standard test methods should be used to determine temperature-dependent thermal properties.

Abstract

This short practice specifies standard mean temperatures for reporting thermal conductivity, thermal resistance, and other thermal properties of insulation materials and assemblies. It is intended to ensure consistency when presenting thermal-property data obtained from recognized test methods so that data from different laboratories and products are comparable. The practice provides recommended test-temperature points and references the test methods and guides used to generate temperature-dependent data.

General information

• Status: Active / reapproved (2023).
• Publication date: Approved March 1, 2023; published April 2023 (designation retains C1058/C1058M−10).
• Publisher: ASTM International.
• ICS / categories: 91.120.10 (Thermal insulation of buildings).
• Edition / version: C1058/C1058M-10 (reapproved 2015; reapproved/recorded 2023) — edition identifier shows original adoption year 2010 with reapproval notation.
• Number of pages: 3 pages (concise practice document).

Scope

This practice covers standard mean temperatures for reporting thermal properties of thermal insulations, products and materials, and related systems and components, both insulated and uninsulated. It directs users to determine thermal properties as a function of temperature by referenced standard test methods (for example, Test Methods C177, C201, C335/C335M, C518, C745, C1114, C1363, Guide C653, Practice C687, used in combination with Practice C1045) and recommends standard test conditions and reporting points so results from different sources are comparable.

Key topics and requirements

• Definition of standard mean temperatures and recommended reporting points for thermal-property data.
• Requirement to determine temperature-dependent thermal properties using recognized ASTM test methods (C177, C201, C335/C335M, C518, C745, C1114, C1363, etc.).
• Guidance on reporting conventions (SI and inch‑pound units treated independently).
• Notes on effects of temperature difference, mean temperature, and high-temperature exposure on measured properties.
• Recommendation that test conditions and the chosen standard temperatures be stated clearly when reporting data to ensure comparability.

Typical use and users

Used by materials and product manufacturers, independent test laboratories, building envelope and mechanical systems designers, specifications writers, and standards committees. Typical applications include preparing thermal-property data sheets, conducting comparative testing of insulation products, providing data for simulation and energy-analysis tools, and supporting procurement/specification language where temperature-dependent thermal performance is relevant.

Related standards

Commonly referenced ASTM standards and guides include: Test Methods C177, C201, C335/C335M, C518, C745, C1114, C1363; Guide C653; Practice C687; Practice C1045; and terminology standard C168. These documents provide the measurement and calculation methods that produce the temperature‑dependent data C1058/C1058M recommends to report.

Keywords

thermal insulation, mean test temperature, thermal conductivity, thermal resistance (R-value), temperature-dependent properties, ASTM test methods, reporting conventions, building envelope, thermal measurement.

FAQ

Q: What is this standard?

A: ASTM C1058/C1058M-10 (2023) is a concise practice that defines standard mean temperatures and recommended reporting conventions for thermal-property measurements of insulation materials, products, and assemblies.

Q: What does it cover?

A: It covers the selection of standard mean temperatures for reporting thermal conductivity and related properties, specifies that properties be determined by established ASTM test methods, and recommends how temperature‑dependent data should be reported to ensure comparability between tests and products.

Q: Who typically uses it?

A: Manufacturers, independent test laboratories, engineers (mechanical and building-envelope), specifiers, energy-modelers, and standards committees use it to standardize how thermal-property data are produced and reported.

Q: Is it current or superseded?

A: The practice retains the designation C1058/C1058M-10 and was reapproved/recorded with a 2023 approval (approved March 1, 2023; published April 2023), so it is an active/reapproved practice as of that 2023 action. Users should consult ASTM for any amendments after that date.

Q: Is it part of a series?

A: It is a practice within ASTM Committee C16 on Thermal Insulation and complements many ASTM thermal‑measurement test methods and guides (listed under Related standards). It is not a multi‑part numbered series but is intended to be used alongside the referenced test methods and practices.

Q: What are the key keywords?

A: thermal insulation; mean test temperature; thermal conductivity; R‑value; temperature-dependent properties; ASTM test methods; reporting conventions.