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How to Choose the Right Filtration Product

Laboratory filtration looks simple from the outside — liquid goes in, clean liquid comes out — but choosing the wrong pore size, membrane material, or filter format is one of the most common (and costly) mistakes in a lab supply order. This guide walks through the decisions that matter.

Step 1: Determine What You're Removing

- 0.22 µm pore size: required for sterile filtration — removes bacteria. Use for cell culture media, buffers entering sterile workflows, and any application where sterility is the goal.

- 0.45 µm pore size: suitable for general clarification and particulate removal where sterility isn't the primary requirement.

- Larger pore sizes (0.8 µm+): used for pre-filtration of solutions with heavy particulate load, to protect a downstream sterilizing-grade filter from clogging prematurely.

Step 2: Match the Membrane Material to Your Fluid

- PES (Polyethersulfone): low protein-binding, high flow rate — ideal for media, serum, and protein-containing solutions.

- Nylon: good chemical resistance, commonly used for aqueous and some organic solvent applications.

- PTFE: highly chemical-resistant, suited for aggressive solvents and gases, though typically lower flow rate for aqueous solutions.

- Cellulose-based membranes: economical for general aqueous filtration where chemical compatibility demands are low.

Step 3: Choose the Right Format

- Bottle-top filters: best for filtering larger batch volumes (100 mL–1 L+) directly into a sterile receiver bottle under vacuum.

- Syringe filters: best for small volumes (under 50 mL), sample prep, or filtering directly into vials or small containers.

- Vacuum filtration assemblies (glass or plastic): best for repeated, high-throughput filtration in a lab that processes many samples.

- Membrane discs (standalone): used when you need to load your own filter into existing reusable hardware.

Step 4: Size the Funnel/Membrane Area to Your Batch

- Match funnel or membrane surface area to your typical batch volume. A funnel that's too small forces multiple filtration cycles and wastes time; a funnel that's drastically oversized for a small batch wastes filter membrane area and, for sterile applications, unnecessarily increases cost per use.

Quick Reference Table

Application	Pore Size	Recommended Material	Format
Cell culture media	0.22 µm	PES	Bottle-top filter
Small sample prep	0.22 µm	PES or Nylon	Syringe filter
Solvent filtration	0.45 µm	PTFE	Bottle-top or syringe filter
General clarification	0.45 µm	Nylon or cellulose	Vacuum filtration assembly

Glassware Material & Type Guide

Not all laboratory glass is the same. Understanding the difference between borosilicate and soda-lime glass helps you choose the right vessel for your workflow.

Borosilicate vs. Soda-Lime Glass

Feature	Borosilicate Glass	Soda-Lime Glass
Thermal Shock Resistance	High resistance. Handles rapid temperature changes.	Low resistance. More prone to cracking.
Chemical Resistance	Strong resistance to acids, alkalis and solvents.	More reactive and less suitable for aggressive chemicals.
Autoclavability	Generally autoclavable.	Not recommended for repeated autoclaving.
Typical Cost	Higher cost with better durability.	Lower cost for simple applications.
Best Use Case	Heating, autoclaving, solvent handling and demanding lab workflows.	Ambient-temperature storage and non-reactive liquids.

            For most laboratory workflows — anything involving a Bunsen burner, hot plate, autoclave, or organic solvent — borosilicate glass (such as Borosil's Type 3.3 glassware) is the appropriate choice. Soda-lime glass is acceptable only for simple ambient-temperature storage where neither heat nor chemical reactivity is a factor.
        

Choosing the Right Vessel Shape

Beakers

General-purpose mixing, heating and rough volume estimation. Not designed for precise measurements.

Erlenmeyer flasks (narrow neck)

Ideal for swirling, mixing, and media preparation where minimizing evaporation and splash matters.

Volumetric flasks

Use specifically when you need a precise, single-volume measurement (e.g., preparing a standard solution) — not for general mixing.

Graduated cylinders

Use for reasonably accurate (but not laboratory-grade-precise) volume transfers; less accurate than volumetric glassware but faster for routine use.

Round-bottom flasks

Best suited to reflux, distillation, and rotary evaporation setups where even heat distribution matters.

Accuracy Classes

Volumetric glassware is commonly available in Class A and Class B. Class A provides tighter tolerances for analytical work, while Class B is suitable for general laboratory applications.

Safety Cabinet & Hazardous Storage Buying Guide

1

Identify What You're Storing

- Flammable liquids → NFPA 30 compliant cabinets
- Corrosive chemicals → Chemical resistant cabinets
- Special hazards → Dedicated storage solutions

2

Choose the Correct Cabinet Size

Cabinet ratings such as 30, 45 and 90 gallons refer to maximum rated capacity. Actual usable storage depends on container size and arrangement.

3

Select Cabinet Placement Style

- Floor standing cabinets
- Under-counter cabinets
- Wall-mounted cabinets
- Piggyback cabinets

4

Confirm Compliance Features

- Self-closing doors
- FM Approval
- Spill containment shelving

Single-Use Systems & Bioprocessing Connector Compatibility Guide

Single-use systems depend on every connection point working correctly. Compatibility between bottles, tubing and connectors is essential.

Step 1: Map Your Fluid Path

Source bottle → tubing → connector → destination equipment. Verify every connection before ordering.

Step 2: Match Closure Threads

- GL45 common laboratory bottle threading
- GL32 smaller neck applications
- VersaCap systems for flexible workflows

Step 3: Select Tubing Material

- Silicone tubing - flexible and biocompatible
- FEP tubing - excellent chemical resistance
- Fluoroelastomer - demanding chemical applications

Step 4: Connector Selection

Match tubing size, port diameter and chemical compatibility to prevent leaks and failures.

Step 5: Sterility Requirements

Confirm every component supports your sterilization method: gamma irradiation, autoclaving or pre-sterilized assemblies.

Single-Use Systems & Bioprocessing Connector Compatibility Guide

Single-use systems depend on every connection point working correctly. Compatibility between bottles, tubing and connectors is essential.

Step 1: Map Your Fluid Path

Source bottle → tubing → connector → destination equipment. Verify every connection before ordering.

Step 2: Match Closure Threads

- GL45 common laboratory bottle threading - GL32 smaller neck applications - VersaCap systems for flexible workflows

Step 3: Select Tubing Material

- Silicone tubing - flexible and biocompatible - FEP tubing - excellent chemical resistance - Fluoroelastomer - demanding chemical applications

Step 4: Connector Selection

Match tubing size, port diameter and chemical compatibility to prevent leaks and failures.

Step 5: Sterility Requirements

Confirm every component supports your sterilization method: gamma irradiation, autoclaving or pre-sterilized assemblies.

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