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EN ISO 20471 Explained: The Complete Hi-Vis Standard Guide for Malaysian Businesses
By Aquaholic Gifts Malaysia | Published 27 March 2026 | 9 min read
EN ISO 20471 is the international standard that specifies the requirements for high-visibility clothing. If you are a procurement manager, safety officer, or HR professional responsible for equipping workers with safety apparel in Malaysia, understanding this standard is essential — even if your country has its own equivalent (SIRIM MS1731:2004).
This guide translates the technical standard into practical decisions: what it covers, how the class system works, which colours and materials qualify, and how it all maps to the Malaysian regulatory landscape. If you are already familiar with the class numbering, our companion article on safety vest Class 1, 2 & 3 differences provides a focused comparison.
What Is EN ISO 20471?
EN ISO 20471 (full title: High-visibility clothing — Test methods and requirements) defines the minimum performance criteria for garments designed to make the wearer conspicuous in hazardous situations during daytime and in the dark when illuminated by vehicle headlights.
The standard was first published by ISO (International Organization for Standardization) and adopted as a European Norm (EN). It replaced the older EN 471 standard in 2013. Most international markets — including the UK, EU, Australia, and many Asian countries — recognise EN ISO 20471 as the benchmark for hi-vis workwear.
What the Standard Covers
The standard specifies requirements for three main properties of hi-vis clothing: the colour and photometric performance of the fluorescent background material, the reflective performance and placement of retroreflective strips, and the minimum area of both materials required for each garment class (Class 1, 2, or 3). It also includes test methods for colour fastness, reflective performance after washing, and dimensional stability.
Approved Colours Under EN ISO 20471
Only three fluorescent background colours are permitted:
These colours are selected because they produce the highest contrast against typical outdoor backgrounds (green foliage, grey concrete, brown earth) during daylight. Fluorescent yellow is the most popular choice in Malaysia for its all-round visibility. Orange-red is common in road construction and oil & gas, while fluorescent red is used less frequently.
Note that standard colours like royal blue, black, or navy are not compliant fluorescent backgrounds. However, they can be used for non-background panels (e.g., bottom sections or trim) provided the minimum fluorescent area for the class is still met.
Reflective Strip Requirements
Reflective (retroreflective) strips are what make the wearer visible in the dark when light from headlights bounces back toward the driver. EN ISO 20471 specifies:
Strip width: Minimum 50 mm (approximately 2 inches).
Placement: Horizontal bands around the torso (at least two bands), plus shoulder-to-waist vertical or diagonal strips on higher classes.
Performance after washing: Reflective strips must maintain retroreflective performance after a minimum of 25 wash cycles at the specified temperature.
Gap between strips: Where two horizontal strips are used, the gap between them should be at least 50 mm to maintain a visible striped pattern from a distance.
EN ISO 20471 vs SIRIM MS1731:2004 — How They Relate in Malaysia
Malaysia has its own national standard for high-visibility clothing: SIRIM MS1731:2004 — High-visibility warning clothing. This standard was developed by SIRIM (Standards and Industrial Research Institute of Malaysia) and aligns with both EN ISO 20471 and the American standard ANSI/ISEA 107.
| Attribute | EN ISO 20471 | SIRIM MS1731:2004 |
|---|---|---|
| Origin | International (ISO) / European (CEN) | Malaysia (SIRIM) |
| Class system | Class 1, 2, 3 | Equivalent class structure |
| Accepted colours | Fluorescent yellow, orange-red, red | Fluorescent yellow, orange, red |
| Used for | Global standard reference | Government tenders, GLC procurement, DOSH compliance reference |
| Practical difference | Minimal. A vest compliant with EN ISO 20471 Class 2 will generally satisfy SIRIM MS1731 requirements and vice versa. | |
If you are bidding on government or GLC contracts, confirm whether the tender documents specifically require SIRIM certification. For private-sector use, EN ISO 20471 compliance is universally accepted. Learn more about Malaysian-specific regulatory requirements in our DOSH safety vest requirements guide.
What This Means for Your Procurement Decision
When you order customized safety vests in Malaysia, understanding EN ISO 20471 helps you specify exactly what you need on a purchase order or quote request. Here is a practical checklist:
1. Identify the risk level of your work environment (see our class comparison guide).
2. Specify the class on your order (e.g., “Class 2 compliant per EN ISO 20471”).
3. Choose a compliant fluorescent colour (yellow is the most versatile).
4. Confirm reflective strip width is at least 50 mm.
5. Verify logo placement does not reduce minimum fluorescent or reflective area.
6. Request a wash-durability confirmation for the reflective strips (especially for daily-wear vests).
At Aquaholic, we guide our clients through every step. As a safety vest Malaysia supplier serving 500+ corporate clients, we ensure every vest we deliver meets the relevant class requirements — and we provide artwork mockups showing exactly how your logo sits relative to the compliant zones. If you are unsure which vest meets your needs, our guide on how to choose the right safety vest can help you narrow down the options.
Frequently Asked Questions
Is EN ISO 20471 legally required in Malaysia?
EN ISO 20471 is not directly written into Malaysian law. However, DOSH requires appropriate PPE under the Occupational Safety and Health Act 1994, and EN ISO 20471 is the internationally accepted benchmark. Most safety plans reference it or its Malaysian equivalent, SIRIM MS1731:2004.
What is the difference between EN ISO 20471 and SIRIM MS1731?
SIRIM MS1731:2004 is the Malaysian national standard that aligns closely with EN ISO 20471 in terms of colours and reflective material. For government tenders, SIRIM certification may be specifically required.
What colours are allowed under EN ISO 20471?
Three fluorescent background colours: fluorescent yellow, fluorescent orange-red, and fluorescent red.
Does customising a safety vest with a logo affect EN ISO 20471 compliance?
It can, if the logo covers fluorescent or reflective material. To maintain compliance, logos should be placed in areas that do not reduce the minimum coverage. A reputable safety vest printing supplier will ensure placement preserves compliance.
Looking for EN ISO 20471 Compliant Safety Vests?
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