ANSI Z535.3-2011 PDF

Full title and description

American National Standard ANSI Z535.3-2011 — Criteria for Safety Symbols. This standard establishes general criteria for the design, evaluation, and use of safety symbols (pictograms) intended to identify and warn against specific hazards and to provide information to avoid personal injury.

Abstract

Specifies requirements and guidance for safety-symbol types, surround shapes and colors, graphic-design considerations, symbol selection criteria, and procedures for evaluating candidate safety symbols so they effectively communicate hazard and avoidance information.

General information

• Status: Superseded — replaced by ANSI Z535.3:2022 (current edition).
• Publication date: 2011 (2011 edition published September 2011).
• Publisher: National Electrical Manufacturers Association (NEMA) / ANSI accredited.
• ICS / categories: Safety signs and colors; electrical/electronics and product safety identification (example ICS entries referenced for Z535 series).
• Edition / version: ANSI Z535.3-2011 (R2017 noted as a reaffirmation).
• Number of pages: 57 pages (2011 edition).

Scope

Applies to the design, selection, evaluation, and application of graphical safety symbols used on products, equipment, signs, and labels where symbol-based hazard communication is necessary to help avoid personal injury. The standard addresses symbol types, recommended surround shapes and colors, visual contrast and legibility, and evaluation/testing procedures to assess comprehensibility.

Key topics and requirements

• Definitions and classification of safety-symbol types (warning, prohibition, mandatory, informational) and recommended surround shapes and colors.
• Graphic-design considerations: clarity, simplicity, contrast, scalable geometry, and use of limited, consistent graphical elements to improve recognition.
• Symbol selection and application criteria: when to use symbols alone, when to pair with signal words or supplemental text, and recommended placement for visibility.
• Evaluation and testing procedures for candidate symbols — including comprehension testing and performance thresholds typically applied in symbol validation (standards commonly reference an approximate 85% open-ended comprehension criterion used in symbol acceptance studies).
• Normative and informative annexes providing design principles, evaluation procedures, and references to related guidance in the Z535 family.

Typical use and users

Used by product designers, safety engineers, label and sign manufacturers, regulatory compliance staff, human factors specialists, technical writers, and procurement teams to create or evaluate safety pictograms for products, machinery, workplaces, and instructional materials. The standard supports manufacturers and organizations aiming for clear, consistent, and testable symbol-based hazard communication.

Related standards

Part of the ANSI/NEMA Z535 family of standards covering safety colors, environmental and facility signs, product safety signs and labels, safety tags/barricade tapes, and product safety information. Closely related documents include ANSI Z535.1, Z535.2, Z535.4, Z535.5 and Z535.6; international references such as ISO 7010/ISO 3864 are also relevant when harmonizing pictograms.

Keywords

ANSI Z535.3, safety symbols, pictograms, symbol criteria, hazard communication, symbol evaluation, comprehension testing, safety colors, Z535 series, NEMA.

FAQ

Q: What is this standard?

A: ANSI Z535.3-2011 is the American National Standard titled "Criteria for Safety Symbols" that specifies criteria for designing, evaluating, and applying safety pictograms used to warn of hazards and to convey safety-related information.

Q: What does it cover?

A: It covers symbol types, surround shapes and colors, graphic-design principles, selection guidance, and procedures for evaluating candidate symbols (including user comprehension testing and recommended validation practices).

Q: Who typically uses it?

A: Product designers, safety and regulatory compliance professionals, human factors engineers, sign/label manufacturers, and organizations that need standardized, tested safety pictograms on products, equipment, or facilities.

Q: Is it current or superseded?

A: The 2011 edition has been superseded — the current edition is ANSI Z535.3:2022 (the Z535.3-2011 text is considered superseded by the 2022 revision).

Q: Is it part of a series?

A: Yes — it is part of the ANSI/NEMA Z535 family of standards covering safety colors, environmental and facility signs, product safety signs/labels, tags/barricade tapes, and product safety information; these documents are intended to be used together for comprehensive safety communication design.

Q: What are the key keywords?

A: Safety symbols, pictograms, hazard communication, symbol evaluation, comprehension testing, Z535.3, Z535 series, safety colors, NEMA, ANSI.