ASTM E1885-25 PDF

Full title and description

Standard Test Method for Sensory Analysis—Triangle Test (ASTM E1885-25). This standard specifies the triangle test procedure used to determine whether a perceptible sensory difference exists between two product samples (or to estimate the magnitude of that difference) by presenting three coded samples — two alike and one different — to panelists and recording discrimination responses.

Abstract

ASTM E1885-25 defines the procedures, assumptions, and limitations for conducting the triangle discrimination test in sensory analysis. It covers when the method is appropriate (homogeneous products, unknown attribute(s) causing differences), basic sample presentation and panel considerations, and statistical interpretation of results. The method is positioned relative to other three-sample tests (for example, duo‑trio and tetrad) and notes circumstances where alternative methods may be preferred.

General information

• Status: Active.
• Publication date: 01 February 2025 (designated E1885-25).
• Publisher: ASTM International.
• ICS / categories: 67.240 — Sensory analysis.
• Edition / version: E1885-25.
• Number of pages: 14 pages (standard document).

Scope

This test method covers a procedure for determining whether a perceptible sensory difference exists between samples of two products or for estimating the magnitude of a perceptible difference when the attribute(s) responsible are not identified. It applies when products are homogeneous and when testing does not cause excessive sensory fatigue, carryover, or adaptation. The triangle test is statistically more efficient than some other three-sample tests but has practical limitations; the standard describes applicability conditions and basic test constraints.

Key topics and requirements

• Triangle test procedure: presentation of three coded samples (two identical, one different), randomization, and response recording.
• Panel selection and size considerations: guidance on number of assessors and panel training needed for reliable discrimination results.
• Sample preparation and homogeneity requirement: products must be sufficiently uniform so that two samples of the same product are generally indistinguishable.
• Statistical interpretation: procedures for analyzing correct responses, chance-level expectations, and drawing conclusions about perceptible differences.
• Limitations and alternatives: notes on sensory fatigue, carryover, and when to use alternative methods (for example, duo‑trio or tetrad tests).

Typical use and users

Used by sensory scientists, quality control and R&D teams in food & beverage, consumer packaged goods, cosmetics, and pharmaceutical industries to detect perceptible differences following formulation, processing, packaging, or storage changes. Also used in contract sensory labs and academic research for discrimination testing and method comparisons.

Related standards

Key related standards and documents from the same ASTM E18 committee and E18.04 subcommittee include: Test Method E2610 (Duo‑Trio Test) and Test Method E3009 (Tetrad Test); these documents describe alternative three‑sample or four‑sample discrimination procedures and are used for method selection and comparison. ASTM committee work items and harmonization activities for these sensory standards are maintained by Subcommittee E18.04.

Keywords

triangle test, sensory analysis, discrimination testing, difference testing, similarity testing, panel testing, sensory procedure, ASTM E1885, ICS 67.240.

FAQ

Q: What is this standard?

A: ASTM E1885-25 is the Standard Test Method for Sensory Analysis—Triangle Test, a procedure for determining whether a perceptible sensory difference exists between two products by asking panelists to discriminate among three coded samples.

Q: What does it cover?

A: It covers the triangle test procedure, applicability conditions (product homogeneity, limits on fatigue/carryover), sample presentation basics, panel considerations, and statistical interpretation of results. It also explains when the test is not appropriate and points to alternative methods.

Q: Who typically uses it?

A: Sensory scientists, QC and R&D laboratories in food, beverage, cosmetics, and related industries, as well as contract sensory providers and academic researchers conducting discrimination testing.

Q: Is it current or superseded?

A: E1885-25 is the current active designation published on 01 February 2025; it supersedes earlier historical versions (for example, E1885-97 and intervening revisions). Users should confirm the edition before purchase or use.

Q: Is it part of a series?

A: Yes — it is part of ASTM Committee E18 sensory analysis standards (Subcommittee E18.04) and is related to other discrimination test standards such as E2610 (Duo‑Trio) and E3009 (Tetrad). These standards are intended to be used together when selecting the most suitable discrimination method.

Q: What are the key keywords?

A: Triangle test, sensory analysis, discrimination test, difference testing, similarity testing, panel testing, ASTM E1885, ICS 67.240.