EN 17353 Type B1 covers removable, free-hanging, two-sided retroreflective devices intended to make a wearer more conspicuous in dark, medium-risk situations. A compliant Type B1 product is more than a reflective pendant: its active area, thickness, attachment, movement, optical performance, durability, marking, and instructions all form part of the assessment.
This guide explains the main Type B1 points for product developers, buyers, importers, and quality teams. It is based on the current EN 17353:2020+A1:2025 edition and the EU PPE framework.
Type B1 requirements at a glance
| Main point | Practical requirement |
|---|---|
| Product form | Removable, free-hanging retroreflective device |
| Lighting condition | Dark conditions, when illuminated by vehicle headlights or searchlights |
| Active faces | Retroreflective on both sides |
| Optical active area | At least 15 cm² per side |
| Maximum total area | No more than 50 cm² per side |
| Shape | Flat, with a maximum thickness of 10 mm |
| Attachment | At least 10 cm between the garment and reflector attachment points |
| Wearing arrangement | At least two devices, one on the left and one on the right side of the torso, for visibility from all sides |
These figures are a useful design screen, but they are not a complete conformity assessment. The finished product also needs the applicable photometric and durability tests, marking, user information, and PPE conformity documentation.
1. Type B1 is a free-hanging device, not a garment class
EN 17353 divides visibility equipment according to the conditions in which it is intended to work and how the visibility material is used. Type B equipment addresses dark conditions through retroreflection. Within that group, Type B1 is specifically for removable devices that hang freely.
Typical product concepts include flat hanging reflectors or pendants attached to clothing. A fixed reflective sticker is not Type B1 because it does not hang freely. A reflective armband belongs to the Type B2 route, while retroreflective material arranged on the torso, or on the torso and limbs, belongs to Type B3.
The distinction matters because each type has its own design and assessment route. Using reflective material that passed a material test does not automatically make the finished product Type B1 compliant.
2. Both sides must be retroreflective
A Type B1 device is designed to turn and swing while the wearer moves. Because either face may point toward approaching light, both sides must be retroreflective and must satisfy the applicable photometric requirements.
Printing, coloured graphics, logos, or other non-retroreflective decoration can reduce the optical active area. Product developers should therefore assess the finished decorated version, not calculate compliance from the blank reflector before printing.
For buyers, the useful question is not simply, “Is the material reflective?” Ask whether both sides of the actual finished device were included in the test scope and whether the test report identifies the same model, construction, colour, artwork, and attachment as the production item.
3. Each face has an area range
The optically active area must be at least 15 cm² on each side. The total area must not exceed 50 cm² per side. Expressed another way, one device provides at least 0.003 m² of retroreflective material across its two faces in total.
The difference between active area and total area is important. A border, hole, printed section, or non-reflective fitting may form part of the physical face without contributing to its optical active area. A drawing that appears large enough can still fail once those exclusions are measured.
Keep controlled drawings for the finished shape and record how the active area was calculated. If artwork or dimensions change after testing, confirm whether the report and certificate still cover the new configuration.
4. The device must be flat and no thicker than 10 mm
Type B1 is not a route for any object that happens to shine back at headlights. The device must be flat, and its maximum thickness is 10 mm.
This requirement is especially relevant when adapting soft toys, padded key rings, bulky promotional charms, or multi-layer accessories. A three-dimensional product may contain retroreflective fabric but still fall outside the Type B1 construction requirements. Product classification should follow the finished design and intended use—not a marketing name such as “reflective tag.”
Children’s products may also trigger additional safety requirements. EN 17353 should not be treated as the only standard or legal assessment needed for a child-appealing accessory.
5. The attachment must allow rotation and a pendulum effect
The string, ribbon, cord, spiral, or equivalent attachment must provide at least 10 cm between the attachment point on the garment and the attachment point on the reflector.
That length is functional. The reflector needs enough freedom to rotate around its vertical axis and move with a pendulum effect. This moving signal helps another road user recognise that a person is present.
A rigidly fixed device, a cord that is too short, or an attachment obstructed by a pocket or bag may defeat the intended movement. The complete attachment system should therefore be included in the product specification and assessment rather than treated as an interchangeable packaging accessory.
6. One compliant device is not the complete wearing arrangement
For visibility from all sides, the user information specifies at least two Type B1 devices: one worn on the left side and one on the right side of the torso.
This point is frequently misunderstood. The standard defines the properties of an individual two-sided device, but the all-sides wearing arrangement uses a minimum of two devices. A single pendant on the front of a backpack should not be promoted as providing 360-degree visibility.
Manufacturers should state the left-and-right wearing arrangement clearly in the instructions. Buyers should confirm that the product is supplied and marketed in a way that enables the user to follow those instructions. See our related explanation of why Type B1 and B2 products are used in pairs.
7. Retroreflective appearance is not proof of performance
Type B1 photometric testing measures each side in the intended hanging orientation at defined observation and entrance angles. The device must meet the applicable luminous-intensity thresholds across those geometries.
The assessment also considers relevant conditioning and durability. Depending on whether the device is flexible or rigid, the programme can include exposures such as cold folding, temperature variation, rainfall, free fall, or water immersion, followed by optical assessment. Visible cracking under an applicable test is a failure.
This is why a material data sheet or a photograph taken with a camera flash is not enough. The evidence should connect the tested sample to the finished product and show the applicable design, photometric, conditioning, marking, and information requirements. Our EN 17353 test-report buyer checklist explains how to review that evidence.
8. EN 17353 covers medium-risk situations—not every visibility risk
Type B1 is intended for enhanced visibility in dark, medium-risk situations. It is not a general replacement for high-visibility equipment under EN ISO 20471.
The correct product follows the real risk assessment: the road environment, traffic, lighting, weather, viewing directions, user activity, and consequences of not being seen. Avoid turning a commonly quoted vehicle speed or detection distance into a universal guarantee. Actual recognition depends on many conditions beyond the reflector itself.
Type B1 is also different from Type A equipment, which uses fluorescent material for daylight conditions. Where both daylight and dark-condition conspicuity are required, the relevant combined Type AB route may be more appropriate.
What changed in the standard reference in 2025?
As of August 2026, the current CEN edition is EN 17353:2020+A1:2025, which supersedes EN 17353:2020. The revised reference was added to the EU list of harmonised PPE standards in June 2026. The earlier EN 17353:2020 reference remains in a transition period and is scheduled to be withdrawn from the Official Journal on 16 December 2027.
This transition does not mean that a manufacturer can choose isolated clauses from different editions. Confirm the edition used for the product assessment, test report, certificate, Declaration of Conformity, marking, and instructions. For new development, discuss the current consolidated edition with the responsible laboratory or conformity-assessment body.
The legal distinction also matters: Regulation (EU) 2016/425 is binding EU law, while a cited harmonised standard provides a recognised route to presumption of conformity for the essential requirements it covers. Meeting one Type B1 design clause alone is not the same as completing CE conformity.
Official references include the BSI listing for BS EN 17353:2020+A1:2025, Regulation (EU) 2016/425, and Commission Implementing Decision (EU) 2026/1279.
Type B1 vs B2 vs B3
| Type | Main product arrangement | Key distinction |
|---|---|---|
| B1 | Removable device hanging freely from clothing | Two-sided reflector that rotates and swings |
| B2 | Device or material positioned on limbs | Limb placement and all-sides visibility requirements |
| B3 | Material positioned on the torso, or torso and limbs | Torso distribution, area, continuity, and placement requirements |
A report for one type does not automatically cover another. Check the claimed type against the product’s actual construction and wearing position. For the wider classification, see EN 17353 types and minimum area requirements.
Buyer and manufacturer checklist
Before approving a Type B1 product, confirm:
- the intended use genuinely falls within dark, medium-risk conditions;
- the finished device is removable, free-hanging, flat, and within the thickness limit;
- both faces are retroreflective and each retains the required active area after printing and fittings;
- the complete attachment provides the required length and free movement;
- instructions specify at least two devices, left and right of the torso;
- the test report identifies the exact finished product and covers both sides plus applicable conditioning;
- marking and user information identify the manufacturer, standard edition, and equipment type;
- the certificate, EU Declaration of Conformity, CE marking, technical file, and production controls are consistent with the product and applicable PPE route; and
- any extra obligations for children, toys, or other intended uses have been assessed separately.
Frequently asked questions
Is a reflective keychain automatically Type B1?
No. It must be a removable, flat, free-hanging device and meet the applicable area, thickness, attachment, two-sided optical, durability, marking, and information requirements in its finished configuration.
Can one Type B1 reflector provide 360-degree visibility?
The specified all-sides wearing arrangement uses at least two devices, one on each side of the torso. Do not present one pendant as a complete 360-degree solution.
Does Type B1 work in daylight?
Type B addresses dark conditions through retroreflection. Type A addresses daylight through fluorescent material, while Type AB combines applicable functions.
Is EN 17353 Type B1 the same as EN ISO 20471?
No. EN 17353 addresses enhanced visibility for medium-risk situations. EN ISO 20471 addresses high-risk high-visibility clothing. Selection depends on the intended use and risk assessment.
Does a material test report prove the finished product complies?
Not by itself. The product design, dimensions, attachment, decoration, both reflective faces, durability, marking, instructions, and conformity documentation must all relate to the identified finished device.
Conclusion
The main idea behind EN 17353 Type B1 is simple but precise: a flat, removable reflector hangs freely so it can turn and swing, reflects from both sides, and is worn as a left-and-right pair for visibility from all sides. The numbers—15 cm² active area per side, 50 cm² maximum total area per side, 10 mm maximum thickness, and a 10 cm minimum attachment length—are essential design checks, not a complete certification shortcut.
Treat the finished product, test evidence, instructions, and PPE documentation as one controlled system. When the product or standard edition changes, confirm the impact with the responsible laboratory or conformity-assessment body before production or placing the product on the market.
This article provides general technical information, not a product-specific conformity assessment or legal opinion. Consult the current standard and the responsible laboratory or conformity-assessment body for the actual product and intended use.