|The term "Heavy
Duty" is no longer subjective, there are EN standards which define
the use and durability of each product.
A suite of European product performance standards (ENs) has been developed for most building components, these include a comprehensive range of product performance standards for architectural hardware.
Products are ‘marked’ with a six or more digit (8 for hinges) classification coding which shows, in detail, just what levels of product performance are being claimed for the item. This classification system enables complementary items to also be specified to, for instance, a common level of corrosion resistance, category of use, door mass, etc. as shown below.
Grade 1: medium frequency of use by people with a high incentive to exercise care and with a small chance of accidents occurring or of misuse
Grade 2: medium frequency of use by people with some incentive to exercise care but where there is some chance of accidents occurring or of misuse
Grade 3: high frequency of use by public and others with little incentive to exercise care and with a high chance of accidents occurring or of misuse
Grade 4: for use on doors which are subject to frequent violent usage
Grade 1: 2,500 cycles
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