Digit 1 – Category of use

Four grades are identified:

– Grade 1: medium frequency of use with a high

incentive to exercise care and a small chance of

misuse, e.g. internal residential doors;

– Grade 2: medium frequency of use by people

with some incentive to exercise care but where

there is some chance of misuse, e.g. internal

office doors;

– Grade 3: high frequency of use by public or

others with little incentive to exercise care and

with a high chance of misuse, e.g. public office

doors;

– Grade 4: high frequency of use on doors which

are subject to frequent violent use, e.g. football

stadiums, oil rigs, barracks, public toilets, etc.

Digit 2 – Durability

Two grades of durability are identified:

– Grade 6: medium use – 100 000 cycles

– Grade 7: high use – 200 000 cycles

Digit 3 – Test door mass

No classification.

Digit 4 – Fire resistance

Four grades of fire resistance are identified:

– Grade 0: no performance determined;

– Grade A: for use on smoke door assemblies.

– Grade B: for use on smoke control and fire

resistance door assemblies.

– Grade C: for use on smoke control and fire

resistance door assemblies with requirement for

special core in the handle/knob.

Digit 5 – Safety

Two grades of safety are identified:

– Grade 0: normal use

– Grade 1: safety application – example handles

must have high strength handle-to-plate and

plate-to-door fixing such that they would

withstand a person grabbing in order to prevent

falling.

Digit 6 – Corrosion resistance

Five grades are identified according to EN 1670:

– Grade 0: no defined corrosion resistance

– Grade 1: mild resistance – minimum requirement

for internal use

– Grade 2: moderate resistance

– Grade 3: high resistance – minimum requirement

for external use

– Grade 4: very high resistance – recommended

for use in exposed marine atmospheres or very

polluted industrial environments.

– Grade 5: exceptionally high corrosion resistance

recommended for use in exceptionally severe

conditions where long-term protection of the

product is required.

Digit 7 – Security

Five grades are identified:

– Grade 0: not approved for use on burglary

resistant doors

– Grade 1: mild burglary resistance

– Grade 2: moderate burglary resistance

– Grade 3: high burglary resistance

– Grade 4: extra high burglary resistance

Note: The main requirements include resistance to

drilling, close fitting plates or escutcheons to help

protect the lock and support the cylinder.

Digit 8 – Type of operation

Three operation types are identified:

– Type A: spring assisted furniture

– Type B: spring loaded furniture

– Type U: unsprung furniture