Gilson 333 - Page 94

94
REFERENCE INFORMATION | 333/334 HPLC PUMPS
REFERENCE INFORMATION
Liquid Contact Materials
Material Description
Ruby / Sapphire
Synthetic rubies and sapphires are single-crystal aluminum oxides,
practically pure for the sapphire (+99,99% Al
2
O
3
). The color of the ruby
is produced by adding a few ppm (parts per million) of chromium oxide
(CrO
3
). Synthetic rubies and sapphires have a hexagonal-rhombic crystal
structure, density of 3.99 g/cm and a water absorption coecient of 0%.
The principal properties of synthetic rubies and sapphires include a
hardness and high mechanical strength, excellent resistance to wear, very
low friction coecient, chemically inert, good thermal conductivity, ideal
electrical insulation.
UHMWPE
UHMWPE (Ultra-high molecular-weight polyethylene) piston seals are
yellow and provide longer service with water, aqueous solutions, alcohols
and acetonitrile.
Stainless Steel,
Type316L
Type 316L is an extra low carbon alloy that oer better corrosion
resistance adjacent to brazes. This alloy contains a maximum of only
0.03% carbon. This amount of carbon is small enough to eliminate harmful
carbon precipitation adjacent to brazes during the brazing operation.
This extra low carbon grade is only recommended for equipment made
for service below the lower sensitizing temperature of 800 deg. F,
especially when corrosive conditions are severe. It is not recommended
for use at high temperature. This grade can be highly polished with no
surface blemishes.
TRADEMARK DESCRIPTION REFERENCES
PTFE, PEEK, FEP, ETFE and Titanium descriptions provided by Valco Instruments Co. Inc. (www.vici.com)
PCTFE description provided by Fluorotherm (www.fluorotherm.com)
Stainless Steel, Type 316L description provided by New England Small Tube Corporation (www.nesmalltube.com)
Ruby/Sapphire description provided by Ceramaret SA (www.ceramaret.ch)