ISO 25947-4:2017

Overview

ISO 25947-4:2017 - Fireworks - Categories 1, 2 and 3 - Part 4: Test methods specifies standardized test methods for consumer and display fireworks classified in categories 1, 2 and 3 (as defined in ISO 25947‑2). It is part of the ISO 25947 series and provides the procedures, test environment requirements and apparatus descriptions that laboratories, manufacturers and conformity assessors use to evaluate construction, performance and safety of pyrotechnic articles.

Key topics and technical requirements

ISO 25947-4:2017 defines a comprehensive set of test topics (see table of contents) including:

• Test environment: indoor and outdoor test area conditions, surface and monitoring height requirements.
• Apparatus: equipment specifications needed to carry out tests reliably.
• Construction and stability tests: handle length, attachments, item length, fuse attachment and resistance to ignition.
• Design verification: conformity to drawings/parts lists and determination of pyrotechnic composition (net explosive content).
• Paper tests: burning matter, horizontal and vertical projected debris tests.
• Ballistics and effects: angle of ascent and height of effects for aerial items.
• Sound measurement: procedures for outdoor sound pressure and indoor sound for items like party poppers and crackers.
• Timing and labelling: timing measurements, label measurement procedures and verification.
• Safety performance tests: extinguishing of flames, burning rate, droop test, projected debris (outdoor), incandescent matter checks, visual and audible examinations.
• Environmental conditioning: mechanical and thermal conditioning procedures and shock testing (Annex A).
• Special tests: striking surface tests, function tests, tube angle determination and methods for specific pyrotechnic constituents (Annex B on silver fulminate).

The standard references normative documents such as ISO 25947‑1 (terminology) and ISO 25947‑3 (labelling), plus relevant ISO apparatus standards.

Practical applications

ISO 25947-4:2017 is used for:

• Product development and design verification to ensure fireworks meet performance and safety expectations.
• Quality control and factory testing to maintain consistent product safety.
• Third‑party testing and certification for market access and regulatory compliance.
• Regulatory enforcement and incident analysis where standardized test data are required.

Using consistent, documented fireworks safety testing methods helps reduce risks associated with pyrotechnics and supports clear conformity assessment.

Who uses this standard

• Pyrotechnic manufacturers and R&D teams
• Accredited testing laboratories and conformity assessors
• Regulatory authorities and product safety inspectors
• Importers, distributors and safety engineers

Related standards

Relevant documents in the ISO 25947 series and referenced ISO standards include:

• ISO 25947‑1, ISO 25947‑2, ISO 25947‑3, ISO 25947‑5
• ISO 3599, ISO 6344‑3, ISO 21948

For manufacturers and labs seeking standardized, repeatable fireworks test methods, ISO 25947-4:2017 is the authoritative reference for categories 1–3.