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SPECIFICATION
(a) British Standard No.3120
1. Scope
This British Standard specifies the
performance requirements for materials
for flameproof clothing when tested by
the specified method, and the marking
of flameproof materials.
(NOTE: The term "flameproof" shall not
be attributed to a textile fabric for
any purpose of trade unless the fabric
complies with the standard prescribed
in regulations in force under the
Fabrics (Misdescription) Act, 1913.
2. Definitions
For the purpose of this British
Standard, the following definitions
shall apply:-
Flameproof material. Material which
complies with the requirements of
this standard.
Inherently flameproof material.
Material which, although not submitted
to a flameproofing process, is flameproof.
Durably flameproofed material. Flameproofed
material which after being submitted
to a washing treatment remains
flameproof.
3. Flameproofness Requirements. The
material shall be tested in accordance
with the requirements of B.S.3119, and
shall comply with the following:-
(a) Duration of flaming. No test
specimen shall continue to flame
for more than 8 seconds after the
igniting flame has been removed.
(b) Extent of after-glow. After-glow
shall not spread beyond the area
of material damaged by flaming.
(c) Length of material which chars or
melts. The average length of
material which chars or melts on
the six specimens shall not exceed
314 in. (85 mm.) and the maximum
length of charred or melted material
in any one specimen shall not exceed
4½ in. (114 mm.).
(b) British Standard No.3121
1. Scope
This British Standard specifies the
performance requirements for textile
fabrics described as of low flammmability.
2. Definitions
Flame resistance rating is a figure
derived from the flammability testing
of fabrics and is of the same order as
the time in seconds necessary for the
propagation of flame over a distance of
100 in. in a vertical strip of fabric.
3. Flame-resistance Rating Requirement.
Any fabric purporting to be of low
flammability within the terms of this
British Standard shall have a flameresistance
rating of 150 or more, or
shall be reported "self-extinguishing"
or "Flame not propagated" when tested,
both in the original state and after
treatment in accordance with Clause 4,
by method A (the vertical strip test)
specified in B.S. 2963. (B.S. 2963 is
"Tests for the flammability of fabrics")
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