A fuel-resistant sole according to EN ISO 20345:2022 is only an optional additional requirement – most Strauss safety shoes offer this performance nevertheless.
Safety shoes of the classes S1P, S3, S5 and S7 are equipped with a puncture-resistant sole made of metal or textile. Shoes that are certified to EN ISO 20345:2022 clearly indicate what type of penetration resistance this is. Textile insoles are marked with an additional S or L - if nothing is specified, it is a puncture-resistant steel midsole. An example:
S3: Safety shoes with metallic puncture-resistance
S3L: Safety shoes with textile puncture-resistance acc. to standard requirement
S3S: Safety shoes with textile puncture-resistance acc. to higher requirement
The difference in textile puncture protection lies in the diameter of the test nail used to apply pressure to the sole. The smaller nail diameter (3.5 mm) creates greater pressure, which is why the puncture resistance is rated higher (higher requirement) compared to a larger nail diameter (basic requirement).
- FO – Resistance of the shoe sole to hydrocarbons (oils, petrol, etc.)
- HI – Thermal insulation, protection against burns on the soles of the feet of up to 150 °C (on hot surfaces for a contact period of up to 30 minutes
- CI – Cold insulation of the sole, protects the feet against low temperatures and, in particular, cold surfaces
- HRO – Resistance to contact heat, brief exposure up to 300 °C
- ESD – Leak resistance of between > 0,1 Megaohm (1,0 x 105 Ohm) and < 100 Megaohm (1,0 x 108 Ohm)
Many Strauss S3 safety shoes are equipped with a dryplexx® functional membrane, going beyond the standard requirements. Thanks to their permanent and reliable protection against water penetration, these S3 shoes possess characteristics comparable to safety shoes of class S7.