Specifications

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

Top Diameter (mm)	Stem Diameter (mm)	Height (mm)	Typical Use
31	4	50	Micro liquid transfer, small vessels
53	6	95	Routine laboratory operations
85	8	120	Routine filtration, transfer
105	11	148	Large volume liquid transfer
160	13	190	Large volume filtration, industrial

Custom sizes available upon request.

📌 Customization Options:
• Material Upgrade: PFA (translucent, visible contents, lower metal leaching)
• Custom Sizes: Non-standard diameters and heights available
• Custom Shapes: Special funnel shapes available — consult our technical team

Product Description

I. Overview

The PTFE funnel is precision-molded from high-purity PTFE resin, offering exceptional chemical resistance, non-stick properties, and wide temperature tolerance. The smooth inner surface ensures smooth liquid flow with no residue or adhesion — ideal for transfer and filtration of corrosive liquids.

Compared to traditional glass funnels, PTFE funnels offer 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 funnels maintain stable performance from -196℃ to 260℃.

Available in five sizes (31mm, 53mm, 85mm, 105mm, 160mm) with optimized stem diameters for compatibility with all laboratory receiving vessels (beakers, volumetric flasks, reagent bottles, etc.). Widely used in pharmaceutical, chemical, semiconductor, and environmental testing laboratories.

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, minimal liquid residue
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. Both inner and outer surfaces are finely polished with smooth, rounded edges — no burrs that could scratch benchtops or damage filter paper.

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

Applications

Typical Applications

Liquid Transfer

Transferring corrosive liquids between containers

Filtration Operations

Solid-liquid separation with filter paper or membranes

Sample Pretreatment

Filtration for analytical testing

Solvent Recovery

Recovery of used organic solvents

Solution Preparation

Liquid transfer during solution preparation

Corrosive Operations

Safe liquid transfer in strong acid/base environments

Industries

Pharmaceutical Drug solution transfer, filtration
Chemistry Labs Corrosive liquid transfer, filtration
Semiconductor Chemical transfer, wet processing
Environmental Testing Water sample pretreatment, filtration
Research General laboratory 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 Top Diameter

Top Diameter	Recommended Use	Typical Applications
31mm	Micro operations	Small volume transfer, micro-filtration
53mm	Routine use	Daily liquid transfer, standard filtration
85mm	Routine use	Larger volume transfer, filter paper filtration
105mm	Large volume	Large capacity liquid transfer, industrial
160mm	Large volume	High-volume filtration, industrial scale

II. By Stem Diameter

4mm stem: For small-mouth vessels (volumetric flasks, small reagent bottles)
6mm stem: For standard-mouth vessels — most versatile
8mm stem: For larger-mouth vessels — for rapid transfer
11-13mm stem: For large capacity vessels — for high-volume operations

💡 Selection Tip: Funnel top diameter should be slightly larger than the receiving vessel opening to ensure smooth liquid flow. Stem diameter should be slightly smaller than the vessel opening to prevent spillage.
For corrosive liquid transfer and filtration, always choose PTFE funnels to ensure zero metal ion contamination risk.
For content observation, choose PFA material funnels.

Operation & Maintenance

User Guide

Standard operating guidelines for PTFE funnels. Proper use and maintenance ensure operational safety and product longevity.

I. Pre-use Preparation

Inspect the funnel for cracks, deformation, and smooth inner surface
Clean with ultrapure water or appropriate solvent to remove manufacturing residues
For trace analysis applications, soak in 10% nitric acid for 24 hours, rinse thoroughly with ultrapure water, and dry
Confirm the receiving vessel is compatible with the funnel stem diameter

II. Liquid Transfer Operation

Place the funnel securely on the receiving vessel — ensure stability
Use a glass rod to guide liquid along the funnel wall — avoid direct impact
After transfer, allow liquid to drain completely — gently lift the funnel

III. Filtration Operation

Fold filter paper into a cone and place in the funnel — wet with solvent to adhere
Pour the liquid slowly along the glass rod — keep liquid level below filter paper edge
Allow complete filtration — collect the filtrate

IV. Cleaning & Maintenance

Routine Cleaning: Rinse promptly with ultrapure water after use — use lab detergent with a soft cloth or sponge
Stubborn Residues: Soak in dilute nitric acid — PTFE's non-stick surface makes cleaning easy
Sterilization: Autoclave (121℃, 15-20min) or dry heat sterilization
Important: Do not use hard brushes or abrasives — they may scratch the surface and affect non-stick performance

V. Important Notes

PTFE is relatively soft — avoid dropping or impact with hard objects to prevent deformation or scratches
Do not use for high-temperature operations (> 260℃)
Avoid contact with molten alkali metals (Na, K) and elemental fluorine
Confirm funnel size matches the receiving vessel before use

💡 From a Seasoned Lab Technician: "Glass rod guide — no splashing" — When transferring, hold a glass rod against the funnel wall and pour liquid along it slowly to prevent splashing and air bubbles.
For viscous liquids, pre-heat the funnel before use — PTFE's low surface tension allows smooth flow.
For filtration, wet the filter paper with solvent first to ensure it adheres to the funnel wall.
Clean immediately after use to prevent residue from drying on the funnel surface.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Chemical Safety

Corrosive liquid transfer must be performed in a fume hood

PPE

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

Operation

Keep funnel stable during transfer — prevent tipping

Compliance

All operations should follow laboratory safety guidelines

PTFE Funnel

Specifications

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Liquid Transfer

Filtration Operations

Sample Pretreatment

Solvent Recovery

Solution Preparation

Corrosive Operations

Selection Guide

I. By Top Diameter

II. By Stem Diameter

User Guide

I. Pre-use Preparation

II. Liquid Transfer Operation

III. Filtration Operation

IV. Cleaning & Maintenance

V. Important Notes

Care & Notes

Chemical Safety

PPE

Operation

Compliance

Need PTFE Funnels?

PTFE Funnel

Specifications

Product Description

I. Overview

II. Core Performance Parameters

III. Material & Workmanship

Applications

Liquid Transfer

Filtration Operations

Sample Pretreatment

Solvent Recovery

Solution Preparation

Corrosive Operations

Selection Guide

I. By Top Diameter

II. By Stem Diameter

User Guide

I. Pre-use Preparation

II. Liquid Transfer Operation

III. Filtration Operation

IV. Cleaning & Maintenance

V. Important Notes

Care & Notes

Chemical Safety

PPE

Operation

Compliance

Related Products

PTFE Buchner Funnel

PTFE Filter Holder

PTFE Stirring Plug

PTFE Solid Plug

Need PTFE Funnels?