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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. 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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