MUHWA Round Floating Tube Rack — Polypropylene Float for 0.5ml & 1.5ml Microcentrifuge Tubes, Combo Pack
MUHWA round floating tube racks provide a stable, durable platform for incubating microcentrifuge tubes in water baths, ice baths, and other temperature-controlled liquid environments. Constructed from chemical-resistant polypropylene, these floating racks keep tubes upright and accessible while maintaining uniform temperature distribution across all samples. The combo pack includes two rack sizes — 26-hole racks for 1.5ml/2.0ml tubes and 8-hole racks for 0.5ml tubes — covering the most common microcentrifuge tube formats in molecular biology, biochemistry, and clinical laboratory workflows. Each well is numbered for sample tracking, and the round design ensures stable flotation without tipping, even in circulating or agitated water baths.
Key Features
- Two-in-One Combo Pack: 5 pieces of 26-hole floating racks (for 1.5ml and 2.0ml tubes) plus 2 pieces of 8-hole floating racks (for 0.5ml tubes and PCR strip tubes). A single SKU supplies both common microcentrifuge tube formats.
- Durable Polypropylene (PP): Chemically resistant to common lab reagents including alcohols, weak acids, and salt solutions. Temperature range from -80degC (dry ice/ethanol slurry) to 100degC (boiling water). Fully autoclavable at 121degC for sterile workflows.
- Stable Round Flotation: The circular platform distributes buoyancy evenly across the rack, preventing capsizing when loaded with tubes. Tubes remain upright and accessible even in agitated or circulating water baths.
- Numbered Wells: Each well position is permanently molded with a number for easy sample identification. Track multiple samples during enzymatic reactions, heat-shock protocols, or restriction digests without confusion.
- High-Visibility Blue Color: Bright blue polypropylene stands out against water bath backgrounds and laboratory bench surfaces, reducing the chance of overlooked or lost racks during busy workflows.
- Nestable for Compact Storage: Racks nest together when empty, minimizing storage footprint in crowded laboratory drawers and cabinets.
Technical Specifications
| Parameter | Specification |
| Material | Polypropylene (PP) |
| Color | Blue |
| Pack Contents | 5pcs 26-hole racks + 2pcs 8-hole racks |
| 26-Hole Rack Compatibility | 1.5ml and 2.0ml microcentrifuge tubes, cryovials |
| 8-Hole Rack Compatibility | 0.5ml microcentrifuge tubes, PCR strip tubes |
| Rack Shape | Round (circular) |
| Well Numbering | Permanently molded numbers per well |
| Temperature Range | -80degC to +100degC |
| Autoclavable | Yes, 121degC, 15 psi, 20 min |
| Chemical Resistance | Resistant to alcohols, weak acids/bases, saline solutions |
| Storage | Nestable for space-saving storage |
| SKU | MH814FR |
Applications
- Water Bath Incubation: Keep microcentrifuge tubes upright and accessible during enzymatic reactions, restriction digests, ligations, and heat-shock transformation protocols at controlled temperatures.
- Ice Bath Chilling: Maintain samples at 0degC during RNA work, protein purification, and enzyme storage without direct ice contact that can contaminate tube exteriors.
- Dry Ice/Ethanol Freezing: Suitable for flash-freezing protocols — the PP construction resists embrittlement at low temperatures for short-term cold exposure.
- Bench-Top Organization: Numbered wells facilitate sample tracking during multi-step protocols performed at room temperature.
- Teaching Laboratories: The combo pack provides an economical tube management solution for university biochemistry and molecular biology practical courses.
Frequently Asked Questions
Q: What is included in this combo pack?
A: The pack includes 5 pieces of 26-hole round floating racks (for 1.5ml/2.0ml tubes) and 2 pieces of 8-hole round floating racks (for 0.5ml tubes) — 7 floating racks total, all in blue polypropylene. This covers the two most common microcentrifuge tube sizes in a single purchase.
Q: Can these floating racks be autoclaved?
A: Yes. The polypropylene construction is fully autoclavable at 121degC (15 psi, 20 minutes). For repeated autoclaving, note that polypropylene gradually becomes more brittle with each cycle — limit to approximately 10-15 cycles for optimal service life.
Q: Do the racks float stably with tubes inserted?
A: Yes. The round design distributes buoyancy evenly, and the tube weight is centered. Racks remain upright and stable even when fully loaded in circulating water baths. For unbalanced loading (e.g., only one side filled), distribute tubes evenly around the rack for best stability.
Q: What tube brands are compatible?
A: The 26-hole racks fit all standard 1.5ml and 2.0ml microcentrifuge tubes from major brands (Eppendorf, Fisher, VWR, Axygen). The 8-hole racks fit standard 0.5ml microcentrifuge tubes and PCR strip tubes. Cryovials (1.5-2.0ml) also fit the 26-hole racks.
Q: Can I use these in a boiling water bath?
A: Yes, the PP material withstands 100degC boiling water. For temperatures above 100degC (e.g., heating blocks set to 105-110degC), use caution as polypropylene softens near 130degC. For standard 95-100degC heat-shock or boiling protocols, these racks perform reliably.
