ASTM F3340-22 PDF

Full title and description

Standard Test Method for Thermal Resistance of Camping Mattresses Using a Guarded Hot Plate Apparatus — ASTM F3340-22. This test method specifies a laboratory procedure to measure the steady‑state thermal resistance (R‑value) of camping mattresses and sleeping pads by placing the specimen between a guarded hot plate and a cooled plate under controlled compressive load and environmental conditions.

Abstract

ASTM F3340-22 defines a repeatable, comparative measurement of thermal resistance for a wide range of camping mattresses (inflatable with or without insulation, self‑inflating foam, closed‑cell foam, etc.) using a two‑plate guarded hot plate apparatus. The method describes specimen preparation, apparatus configuration, test conditions, data reduction and reporting conventions so manufacturers, test laboratories and researchers can consistently evaluate and compare insulation performance of sleeping mats under steady‑state heat transfer conditions.

General information

• Status: Active standard (current edition).
• Publication date: June 15, 2022 (designation F3340‑22).
• Publisher: ASTM International.
• ICS / categories: 17.200.10 (Heat. Calorimetry); 97.200.30 (Camping equipment and camp‑sites).
• Edition / version: F3340‑22 (2022 revision).
• Number of pages: 12 pages.

Scope

This test method covers measurement of the thermal resistance of camping mattresses in steady‑state one‑dimensional heat transfer using a guarded hot plate (two‑plate) apparatus. The mattress is tested under a specified compressive force between an isothermal hot plate and cold plate. The procedure applies to inflatable and non‑inflatable mattress constructions; removable auxiliary insulation (sleeping bags, covers) is excluded from the test. Units are SI. The method produces a repeatable comparative thermal insulation value; users should note that field performance may differ due to real‑world factors such as edge losses, posture changes, variable compression, and covers.

Key topics and requirements

• Use of a two‑plate guarded hot plate apparatus to establish steady‑state vertical heat flow through the mattress specimen.
• Specified sample preparation and conditioning to ensure representative thickness and absence of removable auxiliary insulation.
• Controlled and reported compressive load on the specimen to simulate typical in‑use compression.
• Environmental controls (ambient temperature, air speed) and instrumentation requirements for accurate heat flux and temperature measurement.
• Data reduction procedures to calculate thermal resistance (R) and associated units; requirement to report test conditions and specimen details.
• Precision and interlaboratory performance statements provided via supporting research reports (interlaboratory studies) used for precision guidance.
• Requirement to use SI units as the standard reporting basis.

Typical use and users

Primary users include outdoor gear manufacturers and product designers evaluating insulation performance of sleeping pads, independent testing laboratories performing R‑value verification, quality control departments, consumer test organizations and standards committees. The standard is also used by researchers studying thermal comfort and by procurement/specification writers for outdoor equipment where mattress thermal properties are relevant.

Related standards

Standards and documents commonly referenced with or complementary to ASTM F3340-22 include ASTM C177 (Steady‑State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded Hot Plate), ISO 11092 (Textiles — Measurement of thermal and water‑vapour resistance using a sweating guarded‑hotplate; for human thermal resistance context), and internal ASTM research reports that provide precision statements for F3340 (interlaboratory study reports). Previous revisions of F3340 (e.g., earlier 2018 edition) are also related for historical comparison.

Keywords

thermal resistance, R‑value, camping mattress, sleeping pad, guarded hot plate, steady‑state, insulation, compressive force, test method, ASTM F3340‑22

FAQ

Q: What is this standard?

A: ASTM F3340‑22 is a test method specifying how to measure the thermal resistance (R‑value) of camping mattresses and sleeping pads using a guarded hot plate (two‑plate) apparatus under steady‑state conditions.

Q: What does it cover?

A: It covers specimen preparation, apparatus requirements, test conditions, measurement and data reduction procedures to produce a repeatable comparative thermal resistance value for a wide range of camping mattress constructions. Auxiliary removable insulation is excluded from the measurement.

Q: Who typically uses it?

A: Mattress and outdoor gear manufacturers, independent test laboratories, product designers, consumer test organizations, researchers and specifiers use the standard to evaluate and compare insulation performance of sleeping pads.

Q: Is it current or superseded?

A: The current edition is F3340‑22 (published June 15, 2022). It is the active version; users should check with ASTM International for any amendments or further revisions after this date.

Q: Is it part of a series?

A: F3340 is a standalone test method within ASTM Committee F08 (Sports, Fitness and Outdoor Recreation) work on outdoor equipment. It is complemented by related test methods and guides (for example guarded hot plate methods and human thermal‑comfort test guides) rather than being a numeric series of sequential standards.

Q: What are the key keywords?

A: thermal resistance, R‑value, guarded hot plate, camping mattress, sleeping pad, insulation, steady‑state test method, ASTM F3340‑22.