LSP's self-standing 5ml and 10ml Transport Tubes with FreezeTech™ (aka as mailing tubes, sample tubes, or specimen tubes) are made of virgin polypropylene and supplied with 1¼ turn screw caps (attached). These tubes are CERTIFIED to be leak-proof and 95kPa compliant for trnaport/shipping. They are Certified RNase, DNase, pyrogen Free.
These tubes feature a FreezeTech™ Temperature Indicator patch. With FreezeTech, each tube is equipped with a temperature indicator patch that starts turning blue at 4°C and becomes dark blue when the tube (and its contents) reach 0°C. The indicator patch returns to its original transparent grey color as the sample temperature approaches 4°C and above.
This serves as a warning that critical samples may be reaching undesirable temperatures, making it the ideal vessel for transport of temperature sensitive materials.