ProtectR® tube is the only container closure system engineered to be CO₂ resistant and stop costly damage to molecular and cellular solutions when using dry ice. Made of durable, high-quality materials and fitted with an air-tight cap, ProtectR® Tubes form a protective barrier impermeable to CO₂, keeping the sample pH stable and preventing acidification.

• ATP-, RNase/DNase-, and endotoxin-free (non-pyrogenic)
• Attached CO₂ resistant flat caps, certified to prevent acidification from dry ice shipment or storage
• Caps feature CO₂ resistant elastomeric seal
• Patented anti-smear writing surface
• Three colour printed graduations and reverse reading scale
• Validated Sterilisation (ISO 11137) for use in Research and Medical labs
• Polypropylene USP Class VI resin, free of DiHEMDA, oleamide and BPA
• Freezable to –80 °C
• Autoclavable

Samples of proteins, other biological molecules, and cell cultures are commonly shipped and stored on dry ice, putting them at risk of acidification by up to 2,5 pH units. In standard centrifuge tubes, CO₂ vapour from dry ice enters the tube headspace and causes a significant drop in the pH of the sample. Even in short term storage conditions, samples may become acidified. This acidification can affect the integrity and reproducibility of samples, and may result in a loss of protein activity.

ProtectR® tubes are the ideal vessel for primary and secondary sample containment. Samples are shipped on dry ice in a variety of volumes. When shipped in standard, small volume tubes, samples are at risk of acidifcation. ProtectR® tubes can be used as a secondary shipping tube for multiple small volume tubes. With their airtight, leak-resistant secure seal, ProtectR® tubes provide a protective barrier against CO₂ exposure, safeguarding the sample(s) inside from costly damage. Only ProtectR® tubes ensure consistent sample integrity and protein activity across experiments. Even if samples are delayed during shipping, they will not become compromised, saving time and money.