Specifications

Complete specifications for PTFE Buchner funnels. Items marked Customizable available upon request.

Diameter (mm)	Filter Paper/Membrane (mm)	Typical Use
50	45	Micro filtration, small samples
60	55	Small sample filtration
70	65	Small sample filtration
80	75	Routine laboratory filtration
90	85	Routine laboratory filtration
100	95	Large sample filtration
120	115	Large sample filtration
150	145	Industrial scale filtration

Custom sizes available upon request.

📌 Customization Options:
• Material Upgrade: PFA (translucent, visible contents, lower metal leaching)
• Custom Sizes: Non-standard diameters and heights available
• Perforation Specs: Custom pore size distribution available
• Custom shapes available upon request — consult our technical team

Product Description

I. Overview

The PTFE Buchner funnel is precision-molded from high-purity PTFE resin, specifically designed for vacuum filtration operations. The smooth inner surface with uniformly distributed perforations, combined with filter paper or membranes, enables efficient solid-liquid separation under vacuum.

Compared to traditional ceramic or glass Buchner funnels, PTFE offers overwhelming chemical resistance — compatible with hydrofluoric acid, aqua regia, concentrated sulfuric and nitric acids, and virtually all aggressive reagents — without surface degradation or sample contamination. PTFE's non-stick properties ensure easy cake removal and effortless cleaning.

Available in eight sizes from 50mm to 150mm, compatible with all standard filtration flasks. Widely used in pharmaceutical, chemical, semiconductor, and environmental testing laboratories for vacuum filtration operations.

II. Core Performance Parameters

Purity: High-purity PTFE with ultra-low metal leaching (Pb, U < 0.01ppb)
Operating Temperature: -196℃ ~ 260℃, short-term up to 300℃
Surface Energy: 18.5 mN/m (lowest among solid materials)
Chemical Resistance: Resistant to HF, aqua regia, concentrated H₂SO₄, HNO₃, strong alkalis, organic solvents
Surface: Non-stick, low friction, easy cake removal
Sterilization: Autoclavable (121℃, 2bar) or dry heat sterilization

III. Material & Workmanship

Manufactured from imported high-purity PTFE resin using precision cold pressing and gradient sintering in cleanroom environments — ensuring a dense, bubble-free structure with a smooth, uniform surface. Perforations are uniformly distributed with consistent pore size for optimal filtration efficiency.

Each product undergoes rigorous visual and dimensional inspection to ensure precision and surface quality.

Applications

Typical Applications

Vacuum Filtration

Rapid solid-liquid separation under vacuum

Sample Pretreatment

Filtration for analytical testing

Catalyst Recovery

Recovering solid catalysts from reaction mixtures

Precipitate Collection

Collecting precipitates from chemical reactions

Crystal Separation

Isolating crystalline products from solutions

Corrosive Operations

Safe vacuum filtration in strong acid/base environments

Industries

Pharmaceutical Crystal separation, impurity filtration
Chemistry Labs Product separation, catalyst recovery
Semiconductor Chemical filtration, wet processing
Environmental Testing Water sample prep, solid waste analysis
Research General laboratory filtration operations

Chemical	PTFE Compatibility	Recommended Temperature	Notes
Hydrofluoric Acid (HF)	✅ Fully Compatible	≤ 250℃	PTFE is the only reliable material
Aqua Regia	✅ Fully Compatible	≤ 200℃	Avoid extreme conditions
Conc. H₂SO₄ (98%)	✅ Fully Compatible	≤ 250℃	Handle with care when heating
Conc. HNO₃ (65%)	✅ Fully Compatible	≤ 250℃	Store away from light
NaOH (50%)	✅ Fully Compatible	≤ 200℃	Safe handling required for concentrated alkalis
Organic Solvents	✅ Fully Compatible	≤ Solvent BP	Ensure ventilation and fire safety

Selection Guide

I. By Filtration Volume

Filtration Volume	Recommended Diameter	Typical Use
< 50ml	50mm	Micro sample filtration
50ml ~ 200ml	60mm ~ 80mm	Routine lab filtration
200ml ~ 500ml	90mm ~ 100mm	Large sample filtration
500ml ~ 1000ml	120mm	Large sample filtration
> 1000ml	150mm	Industrial scale filtration

II. By Receiving Vessel

50mm-80mm: Fits small filtration flasks (250ml-500ml)
90mm-100mm: Fits medium filtration flasks (500ml-1000ml)
120mm-150mm: Fits large filtration flasks (1000ml-5000ml)

💡 Selection Tip: Buchner funnel diameter should be slightly smaller than the receiving vessel opening for stable placement and good sealing. Larger filtration volumes require larger diameter funnels for higher efficiency.
For corrosive samples, always choose PTFE Buchner funnels for reliable long-term operation.
For viscous liquids, choose a slightly larger diameter funnel with coarser filter paper.

Operation & Maintenance

User Guide

Standard operating guidelines for PTFE Buchner funnels. Proper use and maintenance ensure filtration efficiency and product longevity.

I. Pre-use Preparation

Inspect the funnel for cracks, deformation, and clear perforations
Clean with ultrapure water or appropriate solvent to remove manufacturing residues
Select appropriate filter paper or membrane (slightly smaller than funnel diameter)
Confirm the filtration flask and funnel are compatible — check sealing ring

II. Filtration Operation

Place filter paper or membrane in the funnel — wet with solvent to flatten
Position the funnel on the filtration flask — ensure good sealing
Start the vacuum pump — once stable, pour the liquid slowly along a glass rod
After filtration, turn off the vacuum pump — wait for pressure balance before removal

III. Cake Handling

After filtration, use a scraper to remove the filter cake
PTFE's non-stick surface ensures easy cake removal — no forceful scraping needed
For drying, transfer the filter paper with cake to an oven

IV. Cleaning & Maintenance

Clean with ultrapure water or appropriate solvent after use — PTFE's non-stick surface makes cleaning easy
Stubborn residues may be soaked in dilute nitric acid
Sterilization: Autoclave (121℃, 15-20min) or dry heat sterilization
Never use hard brushes or abrasives — they may scratch the surface

V. Important Notes

PTFE is relatively soft — avoid dropping or impact with hard objects
Do not use for high-temperature operations (> 260℃)
Avoid contact with molten alkali metals (Na, K) and elemental fluorine
Ensure good sealing between funnel and flask — prevents vacuum loss

💡 From a Seasoned Lab Technician: "Wet first, then filter" — Always wet the filter paper or membrane with solvent to ensure tight contact with the funnel bottom — this prevents leakage around the edges.
For viscous liquids, increase vacuum pressure or use slightly coarser filter paper to improve flow rate.
After filtering corrosive liquids, clean the funnel immediately to prevent surface damage.
Always turn off the vacuum pump first and wait for pressure balance before removing the funnel — prevents liquid backflow.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Vacuum Safety

Ensure the filtration flask is intact — prevent implosion

Chemical Safety

Corrosive liquid filtration must be performed in a fume hood

PPE

Safety goggles, lab coat, acid/alkali resistant gloves required

Compliance

All operations should follow laboratory safety guidelines

PTFE Buchner Funnel

Specifications

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Vacuum Filtration

Sample Pretreatment

Catalyst Recovery

Precipitate Collection

Crystal Separation

Corrosive Operations

Selection Guide

I. By Filtration Volume

II. By Receiving Vessel

User Guide

I. Pre-use Preparation

II. Filtration Operation

III. Cake Handling

IV. Cleaning & Maintenance

V. Important Notes

Care & Notes

Vacuum Safety

Chemical Safety

PPE

Compliance

Need PTFE Buchner Funnels?

PTFE Buchner Funnel

Specifications

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Vacuum Filtration

Sample Pretreatment

Catalyst Recovery

Precipitate Collection

Crystal Separation

Corrosive Operations

Selection Guide

I. By Filtration Volume

II. By Receiving Vessel

User Guide

I. Pre-use Preparation

II. Filtration Operation

III. Cake Handling

IV. Cleaning & Maintenance

V. Important Notes

Care & Notes

Vacuum Safety

Chemical Safety

PPE

Compliance

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