SMI Catalogue 2025/2026 - Flipbook - Page 70
HI-VIS CLOTHING
Employers are obligated to supply any required highsafety risks. It is essential to maintain this clothing in a
HYDROSTATIC
HEAD LEVEL
clean, functional state and offer adequate guidance.
how waterproof a piece of fabric is. The
visibility clothing to employees exposed to significant
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Employees must adhere to wearing the provided
high-visibility gear as instructed by the employer and
promptly notify any damage to their equipment.
Hydrostatic Head (HH) is a way of measuring
manufacturer will take a clear tube and clamp
their material over the bottom end. They will
then fill the tube slowly with water and watch to
see how high the column of water can get
before the material lets it drip through. A
Hydrostatic Head rating of 10,000mm means
that the column of water was 10 metres
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(10,000mm) tall before the material leaked. We
have put the below icons against relevant
garments in this section to demonstrate the
relevant Hydrostatic Head Level Rating.
EN ISO 20471:2013 3 HIGH-VISIBILITY
This European standard ensures the harmonisation of specifications
for high visibility garments. It outlines the criteria for signalling the
user9s presence during both day and night, aiming to enhance visibility
in hazardous environments regardless of lighting conditions.
01428 658 333
The standard encompasses two performance parameters:
X = area covered by fluorescent and retro-reflective material (3 levels)
Y = quality of retro-reflecting materials (2 levels)
