Graduated Self-Standing Transport & Mailing Tubes

Molded from premium, high-grade virgin polypropylene, these rugged tubes are structurally reinforced to endure the extreme physical stresses of shipping and ultra-low temperature freezing. Each tube features a flat, self-standing skirted bottom that lets it sit perfectly upright on your lab bench without a dedicated rack. For maximum operational convenience, they arrive with attached screw caps that require just a quick 1.25-turn to form a certified leak-proof, airtight seal.

Key Functional Benefits:

• Rapid 1.25-Turn Cap Mechanics: The precision-molded threading allows the attached cap to lock down tightly or open up with minimal wrist rotation, accelerating high-volume sample processing and reducing hand strain.
• Pre-Attached Cap Assurance: Arrives with the caps already screwed onto the tubes. This eliminates the tedious bench step of sorting caps, keeps the tube interiors completely sterile, and ensures zero dust or particulate collection prior to use.
• High-Contrast Indexing: The stark white printed graduation marks and oversized matte marking region resist smudging and stay completely legible when exposed to chemical vapors or moisture condensation.

Laboratory Transport & Freezing Strategy:

• Freezer Volumetric Expansion Safety: Polypropylene handles deep-freezing beautifully. However, when freezing aqueous samples or liquid buffers inside these tubes, never fill them past the maximum printed graduation line. Liquid expands when freezing, and overfilling can force the expanding ice upward, stressing the screw threads and compromising the leak-proof seal.
• Aseptic Handling Protocol: The large 1,000-piece master bundle is sub-divided into 10 cleanroom-ready bags of 100 tubes. Bring only one bag at a time into your biological safety cabinet or clean workstation to preserve the strict sterile, RNase-free, and DNase-free profile of the remaining stock.
• Mailing & Courier Regulations: When utilizing these as mailing tubes for diagnostic or environmental specimens, pair them with an appropriate secondary containment pouch and absorbent material to satisfy standard regional transport safety regulations for biological substances.