Purillex TM Bottles for Trace Metals Analysis

Significance of the topic

Trace metals at ppt and sub-ppt levels play critical roles in environmental monitoring, pharmaceutical quality control, and semiconductor manufacturing. Contamination from reagents and storage containers can compromise inductively coupled plasma mass spectrometry (ICP-MS) results. Ensuring ultraclean containers is thus as vital as reagent purity for reliable trace metals analysis.

Objectives and overview

This technical note evaluates the manufacturing, cleaning, and performance of Savillex Purillex™ PFA and FEP bottles. Key aims include:

• Describing stretch blow molding and cleanroom production.
• Outlining recommended cleaning procedures.
• Presenting high-resolution ICP-MS data for 63 elements after acid extraction.

Materials and methods

Production employs virgin high-purity fluoropolymer resin formed into preforms by injection molding, followed by stretch blow molding in a Class 10,000 (ISO 7) cleanroom. Cleaning involves:

• Initial DI water rinse.
• Seven-day soak at 50 °C in 2 % HNO₃/1 % HF.
• Final DI water rinse.

Extraction replicates this acid soak to collect any leached metals. Aliquots were preconcentrated (×125) before analysis by Thermo Element2 HR-ICP-MS. A reagent blank underwent identical treatment for comparison.

Instrumentation used

The following instruments were central to the study:

• Custom in-house stretch blow molding machinery.
• Class 10,000 ISO 7 cleanroom with particle monitoring.
• Thermo Element2 high-resolution ICP-MS for multi-element detection.

Main results and discussion

Reagent blanks showed measurable B (40 ppt), Ca (9 ppt), and Ni (7 ppt), with all other elements at or below detection limits. Extracts from three 500 mL Purillex PFA bottles contained no elements above blank levels. This confirms that, after the prescribed cleaning, bottles introduce no detectable contamination even after acid extraction and preconcentration.

Benefits and practical applications

Purillex bottles offer:

• Superior seal quality due to injection-molded neck and thread.
• No machining or closure inserts required.
• Manufacture in a cleanroom to minimize airborne particulates.
• Use of virgin resin to avoid recycled polymer impurities.

These features make the bottles ideal for ultratrace analysis labs, storage of reagents, and transport of high-purity acids.

Future trends and opportunities

Advances may include automation of molding and cleaning processes, exploration of alternative inert polymers, integration of inline contamination monitoring, and scale-up for larger volumes or specialty geometries. Enhanced resin formulations and surface treatments could further reduce background levels.

Conclusion

Savillex Purillex PFA and FEP bottles, produced by stretch blow molding in a cleanroom and cleaned by a standardized acid protocol, exhibit no measurable elemental leaching by HR-ICP-MS. Their design and manufacturing process ensure reliable ultratrace metal analysis and contaminant-free storage.

References

No external literature cited within the source document.