ISO 7010 · W-series · Warning

W017 Warning; Hot surface

Our drawing, not ISO’s artwork.

A surface here is hot enough to burn.

ISO 7010 reference: W017
Registered title: Warning; Hot surface ISO Online Browsing Platform, ISO 7010 - W017, Warning; Hot surface, reference number and registered title
Colour and shape: Yellow triangle with a black border, black symbol: Warning: a hazard is here

What the yellow triangle with a black border means

In HSE’s guidance on the UK Safety Signs and Signals Regulations 1996, a warning sign has a triangular shape Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), Part 2, warning signs, intrinsic features (a), page 14 and a black pictogram on a yellow background with black edging (the yellow part to take up at least 50% of the area of the sign) Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), Part 2, warning signs, intrinsic features (b), page 14

Its colour stands for: Warning sign, Be careful; take precautions; examine Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), Table 1, yellow or amber, meaning or purpose (page 12)

In the UK: HSE L64

Flammable material or high temperature Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), name under the warning signs in Schedule 1, page 15
In the absence of a specific sign for high temperature. Health and Safety Executive (HSE), L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition), footnote to that sign, page 15

So the UK Regulations' own list has no separate hot-surface sign: it points to the flame sign. ISO 7010 registers W017 for hot surfaces, and L64 allows ISO 7010 signs.

In the US: OSHA

No OSHA general-industry rule we read names this sign or its subject. US signs follow OSHA 1910.145 and ANSI Z535; how the US sign classes work.

Signs people confuse with it, or find beside it

Other warning signs

Sources

ISO 7010 is a paid standard. Its OBP entries are free to view, but they are a script-driven app, so the title and reference number above are copied from the entry's own heading as it lists them (read 2026-09-29), not from the paid text. Other lines in quotation marks are HSE’s or OSHA’s words.

Health and Safety Executive (HSE): L64 Safety signs and signals: The Health and Safety (Safety Signs and Signals) Regulations 1996. Guidance on Regulations (third edition) (published 2015). Used here: name under the warning signs in Schedule 1, page 15; footnote to that sign, page 15; Part 2, warning signs, intrinsic features (a), page 14; Part 2, warning signs, intrinsic features (b), page 14; Table 1, yellow or amber, instruction and information (page 12); Table 1, yellow or amber, meaning or purpose (page 12). www.hse.gov.uk Checked 2026-09-29.
ISO Online Browsing Platform: ISO 7010 - W017, Warning; Hot surface (registered safety sign entry). Used here: reference number and registered title. www.iso.org Checked 2026-09-29.