MATERIAL FOR YOUR CABINET?
Some infornation on materials used
in the fabrication of dry storage, desiccator cabinets.
material noted for its transparency, weather resistance, colour
fastness. Acrylic is important in preservation because of its stability
and resistance to chemical change. Acrylic is available in sheets,
films and resin adhesives. Some common trade names for the sheet
form are Perspex™, Lucite® and Plexiglas®.
is the brand name for acrylic sheet produced only by Lucite International.
Its chemical name is polymethylmethacrylate, or pmma for short.
It was one of the modern generation of plastics first produced in
the mid 1930's.
is derived from a petrochemical feedstock, with the main raw material
being acetone. Acetone is converted into a chemical called methyl
methacrylate, which is then polymerised into Perspex. Due to the
strength of the brand some people refer to any clear plastic as
being perspex which is not true! Not only that, Perspex is manufactured
and sold in a myriad of colours, tones and surface effects.
Three distinct types of Perspex are:
1 Cast Perspex - Originally invented in the 1930’s and continually
improved for over 60 years. The product with the best mechanical
and optical properties, and overall performance.
Perspex - the product with the best thickness tolerance. Typical
tolerance levels are +/-5%
3 Impact Modified Perspex - Products with improved
impact performance where a greater degree of damage tolerance is
needed in service.
All of these materials are made from the same
raw materials and hence not unsurprisingly all of the products have
similar benefits in service. A wide variety of grades are available
to meet specific application performances or for ease of processing.
Some of the benefits of Perspex in use are:
- Some Perspex products have been used used for over 30 years outdoors
without significant deterioration. Cast and extruded PERSPEX are
warranted for a 10-year outdoor service life.
- Excellent Clarity - with 92% light transmission Perspex has superb
water white clarity and transmits about 10% more light than glass.
Recent fashions for POP displays, shelving and furniture have required
a material to resemble the edge colour of glass.
- Safe and easy to Use- Perspex sheet is often used in glazing applications
and is a safety glazing product meeting the relevant safety standards.
It is half the weight of glass of the same thickness with at least
5 times the impact strength and with none of the breakage problems
associated with that material. Fabricating items is relatively simple,
as Perspex is easy to work with using standard workshop techniques.
- Fully Recyclable- unlike other plastics, Perpex has one very unique
attribute - end of life products and waste can be fully recycled.
At high temperatures Perspex acrylic sheet is transformed back into
its base raw chemical - methyl methacrylate - which is fed back
into the process. This is referred to as Closed Loop Recyclability.
The result of this is that even black Perspex can be recycled into
clear Perspex without detrimentally affecting its renowned quality.
In Summary the Properties of Perspex are;
• Exceptional light transmission with virtually no colour
even in thick blocks.
• Excellent resistance to outdoor weathering.
• Good resistance to impact.
• A high gloss, hard surface.
• High tensile strength and rigidity.
• Easily thermoformable with simple workshop tools.
• Easy to clean.
• Capable of being fully recycled.
Perspex Cabinet Cleaning.
For all general purpose cleaning operations, PERSPEX should be washed
clean cold water to which a little detergent has been added. The
any solvents such as methylated spirits, turpentine, white spirit
proprietary window cleaning products is neither necessary nor
We can manufacture your cabinet in
whatever grade of stainless steel you prefer. To help you choose
below is some specifications on the typical grades. If you're not
sure then call us, as we can advise depending on your application.
Grade 304. Austenitic Cr-Ni stainless steel. Better
corrosion resistance than Type 302. High ductility, excellent drawing,
forming, and spinning properties. Essentially non-magnetic, becomes
slightly magnetic when cold worked. Low carbon content means less
carbide precipitation in the heat-affected zone during welding and
a lower susceptibility to intergranular corrosion.
Grade 316. Often
refered as 'marine grade'. Austenitic stainless steel. Excellent
corrosion resistance. Excellent elongation. Non-magnetic. Easily
weldable. Can be polished to a mirror finish. Provides better elongation
and ductility over the "standard" grade. Often used for
food industry, marine, medical, and applications where corrosion
resistance is of higher importance over that of strength or wear
resistance. Essentially this grade would provide better magnetic
resitance than 304, but if this is not an major issue in your application
then 304 will suffice.
Routine Cleaning of Stainless
Steel Cabinets. Use soap, mild detergent or ammonia solutions
in warm water, applied with a soft cloth or nylon sponge. Occasionally
the use of the least course nylon scouring pad may be required.
Rinse and dry with a soft cloth.
Also some hygroscopic plastics such
as plexiglass® will absorb moisture from a high humidity external
environment and pass it through into the cabinet. If your application
does require a barrier from a very humid environment, then perhaps
Stainless Steel should be considered for you desiccator cabinet.
However we find that in most applications acrylic dry storage cabinets
and desiccators perform well and of course provide a 'visual' advantage
over a metal walled cabinet and thus are likely to be opened less
for content inspection, comprimising the environment within. The
choice however is yours!
Tempered glass is about four times
stronger than "ordinary," or annealed, glass. And unlike
annealed glass, which can shatter into jagged shards when broken,
tempered glass fractures into small, relatively harmless pieces.
As a result, tempered glass is used in those environments where
human safety is an issue. Often used as rear windows in vehicles,
entrance doors, shower and tub enclosures, racquetball courts, patio
furniture, microwave ovens and skylights.
Plastic usually abbreviated as PVC, or sometimes
'vinyl'. Not as chemically stable as some other plastics. PVC can
emit acidic components which damage susceptible materials such as
paper. Added chemicals called plasticizers are also used to make
PVC more flexible. These also damage library and archive materials.
PVC STATIC DISSIPATIVE CABINETS
PVC Static Dissipative Plate.
Semiconductors and other sophisticated electronic components are
vulnerable to the effects of electrostatic charges throughout the
The mechanical abrading of surfaces causes electrons to flow from
a supplying surface (positive charge) to a receiving surface (negative
charge). As a result, dust can be attracted to clean room walls,
floors and ceilings, to manufacturing equipment surfaces, and directly
to circuits and contacts of semiconductor devices, with devastating
Moreover, the build-up of static charges can result in uncontrolled
electrostatic discharges (ESD) capable of affecting numerous devices
It is therefore essential to limit materials to those capable of
dissipating static charges (106-8 Ohms/square surface resistivity),
and to provide grounded connections by means of wiring or secure
contact with other grounded materials.
Since transparent plastics are insulative by nature (>=1014 Ohm/square
surface resistivity), imparting of electrical properties requires
molding of opaque, conductive particles into the resin or, in the
case of ESLON® DC Plate, applying coatings that are both conductive
ESLON DC Plate Satisfies Electrical and Optical Requirements
ESLON DC Plate is comprised of clear plastic sheet
coated on both sides with a conductive, transparent surface two-microns
in thickness, providing surface resistivity in the static dissipative
range of 106-8 Ohms/square.
To meet broad application requirements, the plastic substrate is
available in PVC (best chemical and fire resistance - UL Std. 94
V-0), polycarbonate (outstanding high temperature performance and
impact resistance), PMMA and A-PET (optimum clarity).
The substrates are offered in 4 colors: clear, transparent orange,
transparent yellow, and transparent smoked bronze. The coating is
available in two grades: "standard coat" and "hard
coat," the latter being a cross-linked version providing superior
abrasion and chemical resistance.
ESLON DC Plate is also heat-formable using conventional "drape
forming" and "wire forming" methods, allowing two-dimensional
bends up to 90° as well as compound curves.
The electrical, physical and optical properties - and formability
- of ESLON DC Plate make it suitable for a broad variety of electronics
manufacturing applications including:
• Machine and instrument covers and guards
• Clean room glazing and cleanroom cabinets
• Instrument panels
• Circuit board test equipment
• Copy machines
• Static sensitive components in dry storage cabinets or desiccators
STATIC DISSIPATIVE SPRAY
We can prepare your dry storage,
desiccator cabinet with a static dissipative spray. Or alternatively
you can obtain the spray and further details directly from..Chiltern