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M I N E R A L W O O L
I
B U I L D I N G A S U S T A I N A B L E F U T U R E
I
1 5
One of the strong points of mineral wool is its raw material sourcing.
The materials from which mineral wool insulation is made are virtually
inexhaustible
15
resources that have been around and will be around for
millions of years. In addition, mineral wool products are manufactured using
an increased proportion of recycled material.
Production stage
The main components of mineral wool are
inorganic minerals
(sand, stone)
and a low percentage of binder.
Mineral wool is free
fromsubstances of very high concern.(SVHC
16
)
Additives such as fire retardants are not necessary
to ensure or
improve the fire safety of mineral wool as themineral composition
provides a non-combustible product. There is also no need to add
substances to keep the insulation free frommould and insects.
Today’smanufacture of mineral wool insulation
relies heavily
on recycling
. In fact,
recycledmaterial
currently accounts for
between 30% and 60% of themineral wool insulationmanufacturing
input streams and
can reach levels of 80% or even higher
.
Recycled glass
(post-consumer flat and container glass or flat
glass waste from flat glass production) is extensively used as
a raw material for producing glass wool. Stone wool processes
include the use of product waste
bonded into
briquettes
,
of similar approximate size to the lump of rocks.
Manufacturing mineral wool involves
the following steps:
Step 1: Melting
The mineral wool sector uses oxygen-gas, electrical furnaces
and hot blast cupolas with cokes for its production.
Following the melting stage, the processes and environmental
issues are essentially identical.
Step 2: Forming: fiberisation of the melt, binder application,
product mat formation
Themelt from the glass or stone wool furnace flows into specially
designed rotary centrifugal spinners. This forms a veil of fibres,
which passes through a ring of binder sprays that release a
solution of binder andmineral oil onto the fibres to provide integrity,
resilience, durability and handling quality to the finished product.
Melting
Fiberising
and injection of binders
Reception
Curing
"White" glass
Binder becomes
yellow
Cut waste
is recycled
Transversal cut
Longitudinal cut
Melting
Fiberising
and injection of binders
Curing
"Grey" stone
Binder becomes
grey/brown
Cut waste
is recycled
Transversal cut
Longitudinal cut
Glass Wool
Stone Wool