Preparing for Operation
Preparing sample vials
28
specifications. Some of the dimensions are too difficult to measure without
special instruments.
Figure 18. Dimensions for sample vials and microvial inserts
Sample caps and septum
Although septa come in different colors, the characteristics are measured by
inertness and type of composition. There are two basic types of septa used
with both crimp caps and screw-on caps. Each has different resealing
characteristics and a different resistance to interaction with solvents.
• A general-purpose rubber formulation made from natural rubber is coated
with Teflon on the sample side. It has a pH range of 4.0–7.5. It is least
resistant to solvents after puncture, however, it is more easily cored. This
coring may place septum pieces in the solvent that affect your
chromatograms.
• A high-quality, low-extractable silicone rubber, coated with Teflon on one
or both sides, is somewhat resistant to solvents after puncture.
Refer to your Agilent analytical supplies catalog for more information.
28.4
3.5
3.7
Microvial insert
5 minimum
Crimp cap sample vial
8.2 maximum
11.7 0.2
All dimensions in millimeters
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