---
title: "Crib 5 (Fire Test)"
description: "What Crib 5 means in UK fire safety testing, how it relates to foam fillings and BS 7177 hazard grades."
url: "https://bedguide.co.uk/glossary/crib-5/"
category: "glossary"
primary_entity: "crib 5"
date_published: 2026-10-21
date_modified: 2026-10-21
---

# Crib 5 (Fire Test)

> Crib 5 is ignition source 5 in UK furniture fire testing: a small stack of burning wood used as a test flame. The Furniture and Furnishings (Fire) (Safety) Regulations 1988 use it to test foam fillings. The BS 7177 medium hazard grade also adds a source 5 test. Home mattresses are usually labelled low hazard instead.

**Definition.** Crib 5 is ignition source 5: a small stack of burning wood used as a test flame for furniture fillings and some mattresses.

Also called: Crib 5 test, ignition source 5, crib five.

Crib 5 is a lab test, not a promise that an item will not burn.

Keep heaters, candles and smoking materials away from beds and bedding.

Full guide: [UK mattress fire regulations](/care/uk-mattress-fire-regulations).

---

Source: https://bedguide.co.uk/glossary/crib-5/ · BedGuide — independent UK bed guide; paid links are labelled (see /how-we-make-money/). Facts checked against official sources where possible; see https://bedguide.co.uk/editorial-policy. Report an error: https://bedguide.co.uk/corrections.