LAZENBY
METAL SERVICES LTD
POLISHING DIVISION
ON OUR FLATBED GRINDMASTER WE POLISH TO GRIT
FINISHES: 80, 180, 240 & 320 STANDARD OR SILICON FINISHES. NON STANDARD
GRITS ARE ALSO AVAILABLE ON A SHORT LEAD TIME
The basic requirements of polishing are as follows:
■ to remove
undesired features in the base metal – such as laminations, pitting or
mechanical damage,
■ to apply to the
surface the required texture suitable to its particular application at an
acceptable cost.
Cold-rolled surfaces require relatively little
polishing to achieve a “satin” polish, as the reduction in thickness in the cold-rolling
process tends to remove most surface defects.
As polishing stainless steel is an aesthetic process, it is
important to ensure that the desired appearance and consistency is achieved. As
these are ultimately a matter of subjective opinion, it is also important to
consider the intended purpose and location of the finished product.
The desired surface smoothness and grain direction are also factors
to consider, especially with regard to cleaning and maintenance of the product.
This is particularly relevant in the chemical and nuclear industries where
decontamination and cleaning are thorough requirements.
Consideration should also be given to the
distance that the finished product would be viewed at. Slight defects that are
visible on the material will not be noticeable at the likely distance an
installed product would be viewed at. Our normal inspection distance for
wide-belt polishing is 1.5 metres.
POLISHING BOTH SIDES
Due to the inherent nature of sheet manufacture,
only the 'A' surface is guaranteed by the Mills as being suitable for fine
polishing. Consideration must be given to applications where polishing is
required on both sides as the reverse side may not achieve the same standard.
Ra μm
Ra – Roughness Average (also known as CLA –
Centre Line Average) is the most common method of measurement of surface
roughness. It is the arithmetic means for calculating the departure of
roughness profile from the mean line.
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Surface Finishes
COURSE GROUND 80
BS1449 Pt 2
3A
EN10088-02 2G
Approx Ra μm 2.5
A uniform finish with a course texture
DULL POLISH 180
BS1449 Pt 2
3B
EN10088-02 2J
Approx Ra
μm 1.0
A uni-directional abrasive texture, not highly
reflective
DULL POLISH 240/A
BS1449 Pt 2
4
EN10088-02 2J
Approx Ra μm 0.8
A fine dull polish using aluminium oxide belts,
accepted as the ''Industry Standard''
DULL POLISH 240/S
BS1449 Pt 2
5
EN10088-02 2K
Approx Ra μm 0.4
Similar to the above, but with a fine ''clean cut''
finish. Achieved by using a silicon carbide belt.
DULL POLISH 320/A
BS1449 Pt 2
5
EN10088-02 2K
Approx Ra μm 0.6
Popular when a finer polish than 240/A is
required but without the reflectivity of a silicon finish
DULL POLISH 320/S
BS1449 Pt 2
5
EN10088-02 2K
Approx Ra μm 0.3
Similar process to 240/S, but with a smoother
finish. A shallow polish, ideal for thin gauge base material
F.A.Q's
POLISH FINISHES
All the above polishes can be applied to one or
both sides.
SPECIALS
Grit finishes not listed above can be supplied to
order on a short lead time.
TRADE FINISHES
We produce a selection of trade finishes of
varying lustre/sheen and would be happy to work with you to develop the most
suitable polish for your particular application.
COATINGS
We generally recommend a .004" poly easy
peel film coating to protect our surface finishes in either black or white, our
prices include coating.
QUALITY
The Lazenby commitment to quality is ongoing, it has
been an integral ingredient in our business success.
CONSISTENCY
Our quality systems ensure a consistent finish to
our polished surfaces we can also match sample finishes supplied.
TURNROUND
Flexibility is the key to our service you tell us
what is required - usually we can do it!
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