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For long-term storage (or transportation) of conditioned or sampled tubes, long-term 2-piece metal storage caps fitted with combined PTFE ferrules (¼” or 6 mm I.D.) must be selected.
Available in brass and lightweight aluminium (contact Markes for aluminium) in various quantities.
Ferrules are also available separately.
These caps are recommended by international standard methods such as US EPA Method TO-17, ASTM D6196 and EN ISO 16017 and have been validated for up to 27 months storage of sampled/blank tubes. The caps meet a stringent cleanliness specification and tight manufacturing tolerances.
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