Page 117 - SICCO catalog

SICCO Technical Information
SICCO Materials & Glossary
PMMA
coll: acrylic glass
also known under the tradename Plexiglas® of company
Evonik Röhm GmbH
Synthetic, thermoplastic material;
Break proof and impact resistant;
Very good surface, shiny; Good resistance to dilute acids and alkali, limited resistance to organic solvents; Flammable properties similar to hardwood;
Very low production of smoke if burnt; Gases emitted when burning are neither toxic nor corrosive;
Usable up to approx. +70 °C
Volume resistivity: >1015 Ω/cm,
test specification DIN VDE 0303,
Surface resistivity: 5 x 1013 Ω,
test specificationDIN VDE 0303, part 3; Transmittance tD65: ~92 %,
test specification DIN 5036, part 3
PMMA orange
Properties: see above;
tD65 = transmittance according to
DIN 5036 at standard illuminant D65 (daylight, approx 6500 K, DIN 5033): 42 % aD65 = absorbance according to
DIN 5036: 52 %
PC
Polycarbonates are plastics that belong to the group of synthetic polymers and to the family of polyesters. Polycarbonates are transparent and non-coloured but they can easily be coloured. The material is characterized by its high stability, impact resistance, stiffness as well as its rigi- dity. Polycarbonates are widely resistant against atmospheric conditions and radi- ation. They’re flammable but can easily be extinguished by erasing the source
of ignition. Moreover polycarbonates are good isolators. They’re water resistant, resistant against many mineral acids and hydrous solutions of neutral salts and oxidants. Also some other non-polar orga- nic solvents like carbon hydride and many oils and fat do not cause any damage to
polycarbonates. However polycarbonates aren’t resistant against chlorinated carbon hydrides, e.g. dichloromethane. It is also instable against hydrous alkaline solutions, amines and ammonia.
PC-ESD
PC-ESD is made of transparent, two side coated permanent static dissipative material. The dissipative property reduces particle attraction and the generation of electrostatic fields. Complies with
EN 61340-5-1 and ANSI/ESD S20.20-1999
Borosilicate glass
is crystal-clear, non-coloured and shows no significant absorption in the visible spectrum. The permeability of ultraviolet radiation allows it to use the products for photochemical reactions. The refraction index is at 1,472 (with 589,3 nm) and the photoelastic constant is B 3,6 10-6 MPa- 1. The physical properties of borosilicate glass are described in norm DIN ISO 3585. Borosilicate glass has a high chemical resistance against alcohols, water and acids and their mixtures, as well as chlorine, iodine, bromine. The interaction of water only has a small effect on the glass. A thin layer of fused quartz is built up which reduces a further attack on the glass.
Water resistance (ISO 719) Water classification 1 Acid resistance (ISO 1776 Acid classification 1-2 Alcali resistance (ISO 695) Alcali classification 2
Aluminium
This metal stands out due to its very low density of 2,7 g/cm3 (approx. 3 times lighter than steel) and is especially used for the frame and shelves.
Aluminium is very reactive right after being machined and therefore reacts with the substances of the surrounding envi- ronment, air and humidity, which covers the material with a protective oxide layer. This oxide layer prevents a further corro- ding of the aluminium but is dissolvable in acids and bases. Thus a direct contact with chemicals should be avoided.
Stainless Steel
Stainless steel is often used for the production of shelves, plates, collecting or protective trays which are an additional protection against leakage. Compared
to plastics this material has a very good thermal conductivity. The high corrosion resistance can be generated by means
of a nickel alloy. Stainless steel is not only suitable for the use with food but also for applications in the sectors pharmaceutical and biotechnology. In order to avoid an unwanted reaction with metal ions stainless steel should not get in contact with high purity chemicals of the semiconductor industry.
Silicagel
Silicagel is a colourless amorphous silicic acid with a gel-like consistency. It has a large inner surface area. It is very hygroscopic and can be used as gelling agent, filtering or absorption material and desiccant. Normally coupled with
an indicator, Silicagel changes colour as soon as it absorbs water; the gel remains pourable and dimensionally stable even in saturated condition. It can be regenerated on a metallic sieve or on a baking tray at approx. 90–110 °C (a microwave oven is not suitable for regeneration!).
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Materials