Lab Tubes & Vials: The Definitive Selection Guide

Choosing the right lab tubes and vials sounds simple until you're staring at a catalog with 200 options and no clear answer. Polypropylene or polystyrene? Internal thread or external? Conical bottom or round? In our experience working with hundreds of labs on their consumables orders, the wrong tube choice shows up as cracked vials in the freezer, contaminated PCR reactions, or leaking caps during centrifugation — problems that cost far more than the tubes themselves.

This guide is the single reference page you'll bookmark. It covers every tube and vial type we carry, compares materials head-to-head, and gives you a decision matrix so you can match the right tube to your application in under 60 seconds.

Lab Tube & Vial Selection Matrix

Start here. Find your application in the left column and the table tells you exactly what to order.

Tube/Vial Type	Material	Volume Range	Max RCF	Temp Range	Best Application
Centrifuge Tubes (conical)	Polypropylene (PP)	15mL, 50mL	12,000–17,000 ×g	-80°C to 121°C	Cell pelleting, sample prep, general centrifugation
Microcentrifuge Tubes	PP	0.5mL, 1.5mL, 2.0mL	20,000+ ×g	-80°C to 121°C	Molecular biology, enzyme storage, small-volume centrifugation
PCR Tubes & Strips	Thin-wall PP	0.2mL (individual, 8-strip, plates)	N/A	-40°C to 120°C	PCR, qPCR, nucleic acid amplification
Cryogenic Vials	PP	1.0mL – 5.0mL	N/A	-196°C to 121°C	Cell banking, long-term sample storage, liquid nitrogen
Sample Vials (chromatography)	Borosilicate glass or PP	0.3mL – 60mL	N/A	-20°C to 200°C (glass)	HPLC, GC, headspace analysis
Culture Tubes	Borosilicate glass or PS	5mL – 25mL	Low (gravity/gentle spin only)	-20°C to 500°C (glass)	Microbiology, bacterial culture, overnight growth
Test Tubes	Borosilicate glass or PP	5mL – 50mL	Low	Varies by material	General chemistry, heating, mixing, teaching labs
Urine Collection	PP or PS	30mL – 3,000mL	N/A	Room temp / refrigerated	Clinical UA, drug testing, 24-hour collection

Every type listed above links to a dedicated collection on LabSupplies.com. We'll cover each one in detail below — but if you already know what you need, jump straight to our centrifuge tubes, PCR tubes & plates, cryogenic vials, sample vials, culture tubes, test tubes, or urine collection pages.

Materials Deep Dive: PP, PS, Borosilicate, HDPE

The material determines everything — what chemicals are safe, what temperatures are survivable, and whether you can autoclave or centrifuge the tube. Here's the comparison that matters.

Property	Polypropylene (PP)	Polystyrene (PS)	Borosilicate Glass	HDPE
Temp Range	-80°C to 121°C	-20°C to 70°C	-196°C to 500°C	-100°C to 120°C
Autoclavable	Yes (121°C, 15 min)	No	Yes	Limited
Centrifuge Safe	Yes (high RCF)	Limited (low RCF only)	No (breakage risk)	Moderate
Chemical Resistance	Excellent (acids, bases, most organics)	Poor (attacked by organics)	Excellent (except HF, hot alkali)	Good (acids, bases; poor with organics)
Clarity	Translucent	Crystal clear	Clear	Opaque
Cost	Low	Lowest	Moderate–High	Low
Best For	Centrifugation, PCR, cryo, general	Visual assays, spectrophotometry, tissue culture	Heating, chemistry, reusable labware	Chemical storage, reagent bottles

The rule of thumb: If you're centrifuging, freezing, or autoclaving — use PP. If you need optical clarity for colorimetric assays — use PS. If you're heating over a flame or using harsh solvents — use borosilicate glass.

Chemical Compatibility Quick Reference

Chemical	PP	PS	Borosilicate	HDPE
Dilute acids (HCl, H₂SO₄)	✅	✅	✅	✅
Concentrated acids	✅	❌	✅	✅
Bases (NaOH, KOH)	✅	⚠️	⚠️ (etches over time)	✅
Acetone	⚠️	❌ (dissolves)	✅	⚠️
Ethanol / Methanol	✅	❌	✅	✅
Chloroform / DCM	❌	❌	✅	❌
DMSO	✅	❌	✅	✅

This chart alone prevents the most common tube failure we hear about from customers: someone stores a solvent in PS and finds a melted, sticky mess the next morning. Bookmark this page.

Centrifuge Tubes: 15mL vs 50mL and Everything Between

Conical centrifuge tubes are the workhorses of any wet lab. The conical bottom concentrates your pellet into a small point, making it easy to remove the supernatant without disturbing the sample. Round-bottom tubes distribute the pellet along the side — useful for gentle resuspension but harder to aspirate cleanly.

15mL conical tubes are your default for cell culture work (pelleting cells from 5–10mL suspensions), small-volume sample prep, and reagent aliquoting. 50mL conical tubes handle larger volumes — media preparation, tissue digestion, buffer mixing, and centrifugal washes of larger cell populations.

What to Look For When Ordering

• Material: Polypropylene only. PS conical tubes exist but can't handle high RCF — they crack.
• RCF rating: At minimum, 12,000 ×g for 15mL and 16,000 ×g for 50mL. Our Globe Scientific tubes are rated to handle these forces without deformation.
• Certifications: DNase/RNase-free and pyrogen-free if you're doing molecular biology or cell culture.
• Graduations: Printed (not molded) graduations are easier to read.
• Cap type: Screw caps with O-ring seals prevent leaking during centrifugation. Flat-top caps are easier to write on.
• Sterility: Buy sterile for cell culture. Non-sterile saves money for general chemistry.

Browse our full centrifuge tubes collection — Globe Scientific tubes certified DNase/RNase-free, shipped from the USA.

PCR Tubes, Strips & Plates: Format Selection Guide

PCR consumables come in three formats, and the choice is really about throughput and cost.

Format	Samples per Run	Setup Time	Cost per Reaction	Best For
Individual tubes (0.2mL)	1–16	High	$0.08–0.15	Low-throughput, optimization, single reactions
8-strip tubes	8–48	Medium	$0.05–0.10	Mid-throughput, flexibility, easy labeling per strip
96-well plates	96	Low (with multichannel)	$0.03–0.06	High-throughput screening, routine assays

Why Thin-Wall Construction Matters

PCR tubes must have thin walls for efficient thermal transfer between the heating block and the sample. Standard microcentrifuge tubes have walls 2–3x thicker — they insulate the sample instead of conducting heat, leading to incomplete denaturation, poor annealing, and failed reactions. Never substitute a regular 0.2mL or 0.5mL tube for a PCR tube.

Cap Types for PCR

Flat caps are the standard for conventional PCR. Domed caps reduce condensation and work better for low-volume reactions. Optical caps (or optical adhesive film on plates) are mandatory for qPCR — they're transparent to the fluorescence detection wavelengths. Using a non-optical cap on a qPCR instrument gives you zero signal.

Shop our PCR tubes & plates collection — compatible with all major thermal cycler brands.

Cryogenic Vials: Surviving -196°C

Cryogenic vials store biological samples at ultra-low temperatures — typically -80°C in mechanical freezers or -196°C in liquid nitrogen (LN2). The stakes are high: a failed vial means losing irreplaceable cell lines, patient samples, or months of work.

Internal Thread vs External Thread: This Is a Contamination Decision

This is the detail most guides skip, and it matters more than any other spec on a cryovial.

External thread vials have the thread on the outside of the cap. When submerged in liquid-phase LN2, liquid nitrogen seeps into the threads. During thawing, that trapped LN2 expands rapidly — creating an explosion risk. Worse, if one vial in your LN2 tank leaks, its contents contaminate the liquid nitrogen, which then contacts every other externally-threaded vial in the tank.

Internal thread vials have the thread inside the cap, creating a smooth exterior with no crevices for LN2 to enter. They're the safer choice for liquid-phase storage. The trade-off: slightly harder to grip when wearing cryogloves.

Our recommendation: Use internal-thread vials for liquid-phase LN2 storage. External thread is acceptable for vapor-phase LN2 storage or -80°C mechanical freezer storage, where liquid contact isn't a factor.

Other Selection Criteria

• Material: Polypropylene rated to -196°C. Never use PS — it shatters at cryo temps.
• Seal: Silicone washer gaskets create a tighter seal than bare thread contact.
• Self-standing vs round-bottom: Self-standing (skirted) vials sit upright in racks. Round-bottom vials fit standard cryoboxes but need a rack to stand.
• Labeling: Standard labels fail at cryo temps. Use CryoLabels or a cryo-marker. Write on the vial BEFORE freezing.

Browse our cryogenic vials collection at LabSupplies.com. Pair them with our freezer boxes for organized storage — cardboard for -20°C and -80°C, polycarbonate for LN2.

Sample Vials for Chromatography (HPLC & GC)

Chromatography vials are precision consumables that interface directly with your autosampler. A poorly made vial causes needle damage, seal failures, and evaporation — any of which can ruin a run and waste hours of instrument time.

Clear vs Amber Glass

Clear borosilicate glass is the default for most HPLC and GC applications. Use it when your analyte is not light-sensitive and you want visual confirmation of sample volume and clarity.

Amber glass blocks UV light below ~450nm, protecting light-sensitive compounds from photodegradation. Use amber for: vitamins, certain pharmaceuticals, fluorescent dyes, light-sensitive metabolites, and any sample that will sit in the autosampler tray for extended runs.

Cap and Closure Types

Closure Type	Seal Quality	Ease of Use	Best For
Crimp cap	Best — hermetic seal	Requires crimper tool	GC headspace, volatile analytes, long runs
Snap cap	Good	Fastest — press on	High-throughput HPLC, non-volatile samples
Screw cap	Very good	Moderate — twist on	General HPLC, re-injection, sample storage

Septa Materials

The septum is the rubber/silicone disc inside the cap that the autosampler needle pierces. PTFE/silicone is the standard — the PTFE layer faces the sample (chemically inert) and the silicone layer provides the reseal. For GC headspace work, use PTFE/butyl rubber for better gas-tight performance.

Globe Scientific manufactures chromatography vials in the USA — consistent quality with shorter lead times than imported alternatives. As an authorized dealer for Globe Scientific, we work directly with their engineering team and can help you spec the right vial, cap, and septum combination for your instrument. Reach out at support@labsupplies.com.

Shop our sample vials collection — Made in USA options available.

Culture Tubes, Test Tubes & Urine Collection

Culture Tubes

Culture tubes are used for growing bacteria, yeast, and other microorganisms. They come in borosilicate glass (reusable, autoclavable) or disposable polystyrene. Glass culture tubes withstand autoclaving and can be reused hundreds of times. Disposable PS tubes save time on cleaning but can't be autoclaved.

Cap types matter for aeration: metal caps and loose-fitting plastic caps allow gas exchange for aerobic growth. Screw caps create a tighter seal for anaerobic work or sample transport.

Browse culture tubes.

Test Tubes

General-purpose test tubes are available in borosilicate glass (for heating, chemistry, and teaching labs) or PP (for cold storage and low-speed centrifugation). Rimmed tubes accept rubber stoppers; rimless tubes are easier to clean and pour from. For teaching labs where breakage is a concern, PP tubes are a cost-effective alternative to glass.

Browse test tubes.

Urine Collection

Clinical urine collection containers come in multiple formats depending on the test: standard specimen cups (with or without temperature strips for drug testing), 24-hour collection containers (typically 3L with wide mouth), and vacuum-style transfer tubes. Drug testing and clinical urinalysis have different container requirements — drug testing cups often require tamper-evident seals and integrated test strips.

Browse urine collection.

Tube Caps & Closures: The Part Everyone Forgets

Caps fail more often than tubes. A cap that doesn't seal properly leaks during centrifugation, allows evaporation during storage, or lets contaminants in during transport. Always match the cap to the tube diameter and application.

Cap Type	Seal Quality	Speed to Close	Best For
Screw cap (flat top)	Excellent — especially with O-ring	Moderate	Centrifugation, transport, long-term storage
Snap cap	Good for low-pressure applications	Fast	Quick access, room-temp storage, sample prep
Press-fit plug cap	Moderate	Fastest	Test tubes, culture tubes, temporary closure

Color-coded caps are useful for sample organization — but make sure the color comes from a metal-free dye if you're doing trace metal analysis. Cap colors can leach cadmium or other metals into samples if the pigments aren't certified.

Browse tube caps & closures at LabSupplies.com.

Frequently Asked Questions

Can I autoclave polypropylene centrifuge tubes?

Yes. PP is autoclavable at 121°C for 15–20 minutes. Loosen the caps before autoclaving to prevent pressure buildup and deformation. Polystyrene tubes cannot be autoclaved — they'll warp and melt at autoclave temperatures.

What's the difference between internal and external thread cryovials?

Internal thread vials have a smooth exterior with no crevices for liquid nitrogen to enter, making them safer for liquid-phase LN2 storage. External thread vials can trap LN2 in the threads, creating explosion risk during thawing and potential cross-contamination between samples.

Do I need certified DNase/RNase-free tubes for PCR?

For standard PCR with robust polymerases and abundant template, non-certified tubes usually work fine. For qPCR, low-copy-number amplification, or clinical diagnostics, certified tubes eliminate a variable that could compromise your results. The cost difference is typically $0.01–0.02 per tube.

What tube material should I use for organic solvents?

Borosilicate glass. Most plastics (PP, PS, HDPE) are attacked by chlorinated solvents like chloroform and DCM. PP handles ethanol and methanol acceptably but degrades with prolonged exposure to acetone, toluene, or other aggressive organics. Check the chemical compatibility chart above.

What size centrifuge tube do I need?

Match the tube to your sample volume — the tube should be 50–75% full for optimal centrifugation. For cell culture pelleting, 15mL handles most single-flask harvests. For tissue digests, buffer washes, or pooled samples, use 50mL.

Choose the Right Tube — Every Time

The tube or vial you choose is the container your science lives in. The wrong material cracks in the freezer. The wrong cap leaks in the centrifuge. The wrong certification contaminates your PCR. Every one of those failures costs more time and money than the tube itself.

Use the selection matrix and material charts on this page to make the right call. And when you're ordering in bulk, remember that LabSupplies.com carries Globe Scientific tubes and vials with below-retail pricing, certified quality, and everything ships from the USA.

Starting a new lab? Our LaunchLab program gives you 15% off everything for 12 months — including every tube, vial, and closure on this page. See if you qualify →

Ready to order? Browse our complete tube and vial collections: centrifuge tubes · PCR tubes & plates · cryogenic vials · sample vials · culture tubes · test tubes · caps & closures · urine collection — authorized dealer pricing, ships from the USA.

— By the LabSupplies.com Technical Team