Parafilm in the Laboratory: Sealing, Storage, and Best Practices

Parafilm is a flexible, stretchable sealing film used in laboratories worldwide. Known for its ability to create airtight and moisture-resistant seals, it is indispensable for sample storage, culture protection, and chemical handling. For Australian schools, universities, and research labs, proper use of Parafilm improves safety, reduces contamination, and extends sample stability.

What is Parafilm?

Parafilm is a thermoplastic, stretchable film that can conform to irregular shapes. It is resistant to many acids, bases, and alcohols, making it versatile for covering beakers, flasks, petri dishes, and test tubes. Its semi-permeable structure allows some gas exchange, which is useful in microbiology applications.

Applications of Parafilm

• Chemical Storage: Wrapping reagent bottles to reduce evaporation and contamination.
• Microbiology: Sealing Petri dishes while allowing limited gas exchange for cultures.
• Sample Transport: Providing secure, spill-resistant seals during short-term transport.
• Education: Used in teaching labs for simple, safe sealing of test tubes and beakers.

Case Study: Food Science Lab in Melbourne

A food science lab in Melbourne began sealing sample vials with Parafilm to prevent evaporation during sensory testing experiments. Compared to screw caps alone, Parafilm reduced sample weight loss by 22% over 48 hours, improving consistency in results. The lab has since adopted Parafilm sealing for all volatile liquid samples.

Comparison Table: Parafilm vs Alternatives

Practical Applications in Australian Labs

• Education: Easy sealing for student experiments.
• Research: Protecting volatile samples and culture plates.
• Industry: Securing QC samples in pharmaceuticals, food, and cosmetics.

FAQs

Q1. Is Parafilm reusable?
No. It is designed for single-use sealing to prevent contamination.

Q2. Can Parafilm withstand autoclaving?
No. It deforms under high heat and should not be used inside autoclaves.

Q3. What makes Parafilm different from plastic wrap?
It provides chemical resistance, moisture protection, and a better seal.

Q4. Is Parafilm safe for microbiology?
Yes. It is commonly used for sealing Petri dishes and preventing contamination.

Q5. Does LabChoice Australia supply Parafilm?
Yes, available in laboratory-grade rolls suitable for multiple applications.

References

• ASTM E671: Standard Terminology Relating to Contamination Control
• ACS Laboratory Handling Guidelines
• University of Sydney Microbiology Lab Manual
• NIST Laboratory Consumables Standards
• Parafilm Manufacturer’s Technical Data Sheet