Page 466 - NORTON cutting-off and grinding wheels - industrial

466 TECHNICAL INFORMATION
TECHNICALINFORMATION
BACKING TYPES
CLOTH
Cloth backings are more durable than paper, offer
greater resistance to tearing, and tolerate continual
bending and flexing during use. Norton use
traditional woven cloth in the manufacture of their
coated abrasives. The backing has construction and
finishing characteristics designed to make it ideally
suited to a specific application. The standard cloth
weights used in coated abrasives are indicated by a
letter code which appears immediately after the grit
size on the finished product backing.
J-weight
The lightest and most flexible cloth backing, this
backing is used where finish and uniformity of the
surface are more important than stock removal.
Ideal for finishing, blending and where flexibility and
conformity are required, such as contour work or
curved surfaces.
X-weight
Stronger and relatively stiff when compared
to J-weight, this backing is used on products
designed for coarse grit stock removal applications
through fine grit finishing and polishing. Consistent
productivity, relatively good finishes and long
product life are characteristics of products made on
X-weight backings.
Y-weight
Stronger and more resistant to longitudinal splitting
than regular drills cloth, Y-weight backing is used
on products designed for severe applications, such
as narrow belt grinding of hand tools and wide belts
sanding of lumber and particleboard dimensioning.
FIBRE
Fibre backings, made of multiple layers of
impregnated paper, are very hard and strong,
yet provide sufficient flexibility for the intended
applications. 0,8mm thick fibre has the greatest
strength of any backing used for coated abrasives.
This backing is used on resin bonded fibre
discs designed for heavy duty portable grinding
applications.
COMBINATION
Combination backing, constructed by laminating
light cloth and stiff E-weight paper, is used where
resistance to tearing and breaking is a requirement.
Primarily utilised on products designed for
chipboard/MDF sanding.
FILM
Polyester is used as the backing media for Norton’s
range of precision graded microfinishing products.
Film backings can be used wet or dry and have
excellent resistance to chemical attack, while being
tear resistant and durable.
SPECIAL COATED SURFACE TREATMENT
NO˜FIL TREATMENT
In order to provide even further resistance to
loading, some Openkote paper products are given a
special surface treatment of zinc stearate after the
sizing operation. Such products are ideal for sanding
between sealer coats on furniture, sanding after
primer coats on automobiles, removing varnish
from wood, and numerous other operations where
conventional abrasive products fail prematurely due
to loading.
Norton’s trademark for products utilising this
treatment is No-Fil.