Specifications

Standard specifications for PTFE volumetric flasks. Items marked Customizable are available upon request.

Capacity	Body OD (mm)	Height (mm)	Neck ID (mm)	Net Weight (g)
25ml	43	96	14	45
50ml	53	118	20	85
100ml	67	133	20	120
200ml	80	150	28	215
250ml	89	166	28	280
500ml	105	174	31	380
1000ml	144	263	36	630

📌 Customization Notes:
• Material Upgrade: PFA (translucent, visible liquid level, lower metal leaching)
• Sealing Type: PTFE ground stopper / Screw cap
• Accuracy Grade: Class A with calibration certificate
• Custom specifications available upon request

Product Description

I. Overview

The PTFE volumetric flask is manufactured from high-purity PTFE resin through cold pressing and high-temperature sintering. PTFE offers exceptional chemical resistance and is inert to almost all chemicals and solvents, making it ideal for HF-based sample preparation and ultra-trace analysis.

Featuring a classic pear-shaped body with a narrow neck, equipped with a PTFE ground stopper or screw cap. PTFE volumetric flasks eliminate leaching issues associated with glass in HF systems, while ultra-low metal leaching ensures accurate trace analysis results.

Available in sizes from 25ml to 1000ml, widely used in pharmaceutical, chemical, semiconductor, environmental testing, and geological analysis industries.

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℃
Chemical Resistance: Resistant to HF, aqua regia, concentrated H₂SO₄, HNO₃, strong alkalis, and organic solvents
Surface Properties: Non-stick, low friction coefficient, easy to clean
Volumetric Accuracy: Class A precision available

III. Material & Workmanship

Manufactured from imported high-purity PTFE resin, precision cold-pressed in molds, and sintered in high-temperature furnaces — ensuring dense structure, smooth surface, and bubble-free finish. The stopper and neck are precision-ground for reliable sealing and volumetric accuracy.

All products are assembled and packaged in cleanroom environments to ensure contamination-free surfaces.

Applications

Typical Applications

ICP-MS / ICP-OES Analysis

Sample digestate volumetric with low background

Semiconductor Industry

Ultra-pure chemical dilution and volumetric

Environmental Monitoring

Acid digestion volumetric for water and soil samples

Geological Sample Analysis

HF-based rock and mineral digestion volumetric

Pharmaceutical Industry

API and intermediate assay preparation

Application	Recommended Capacity	Recommended Material	Notes
ICP-MS Trace Element Analysis	25ml / 50ml	PFA	Class A accuracy
HF Geological Sample Digestion	50ml / 100ml	PTFE	PTFE is the only reliable choice
Environmental Water Analysis	100ml / 250ml	PTFE / PFA	Avoid cross-contamination
Pharmaceutical Assay	100ml / 200ml	PTFE	Regular calibration required
Semiconductor Ultra-pure Chemicals	500ml / 1000ml	PFA	Cleanroom operation

Selection Guide

I. By Volumetric System

Volumetric System	Recommended Material	Recommended Sealing
Hydrofluoric Acid (HF) Systems	PTFE (only reliable choice)	PTFE ground stopper
Aqua Regia / Concentrated Acids	PTFE	PTFE ground stopper
Strong Alkali Systems	PTFE	PTFE ground stopper
Ultra-trace Analysis (ICP-MS)	PFA (recommended)	Screw cap
Organic Solvent Systems	PTFE	Screw cap

II. By Capacity

25ml ~ 50ml: Micro sample volumetric, precious sample analysis
100ml ~ 250ml: Routine volumetric operations
500ml ~ 1000ml: Large volume samples, batch analysis

III. By Transparency Requirement

PTFE Volumetric Flask: Opaque white — requires level indicator or gravimetric method
PFA Volumetric Flask: Translucent — direct meniscus viewing for easier volumetric

💡 Selection Tip: For ultra-trace analysis (ICP-MS level), PFA is strongly recommended for its ultra-low metal leaching and translucent properties for easy level viewing.
For HF-containing digestates, PTFE is the only reliable choice — glass volumetric flasks are corroded by HF.
Always perform volumetric operations at constant temperature (typically 20℃) for maximum accuracy.

Operation & Maintenance

User Guide

Standard operating guidelines for PTFE volumetric flasks. Proper use and maintenance are critical for volumetric accuracy.

I. Pre-use Preparation

Inspect the flask for cracks, deformations, and ensure the stopper fits properly
Clean the flask inside and out 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
Ensure the flask is at constant temperature (typically 20℃) before volumetric

II. Volumetric Operation

Transfer the sample solution to the flask, rinsing the original container with solvent multiple times
Add solvent to near the mark, then add dropwise with a dropper or pipette to approximately 0.5mm below the mark
For PTFE flasks (opaque), use gravimetric method with an analytical balance or a level indicator
For PFA flasks (translucent), observe the meniscus bottom tangent to the mark
Cap and invert to mix thoroughly at least 10 times to ensure homogeneity

III. Cleaning & Maintenance

Routine Cleaning: Clean promptly after use with ultrapure water
Stubborn Residues: Soak in dilute nitric acid — PTFE's non-stick surface makes cleaning easy
Important: Do not use hard brushes or abrasives — they may scratch the inner surface, affecting accuracy
Calibration: Annual calibration is recommended to verify accuracy

IV. Important Notes

PTFE is relatively soft — avoid dropping or impact with hard objects
Do not heat or store reactive substances in volumetric flasks
Perform volumetric at constant temperature (typically 20℃) — temperature variations affect accuracy
Avoid contact with molten alkali metals (Na, K) and elemental fluorine

💡 From a Seasoned Lab Technician: "PTFE is opaque — weigh for accuracy" — PTFE volumetric flasks require gravimetric volumetric: weigh the empty flask, add solvent to target weight, calculate volume from density. Accuracy can reach 0.1%.
For PFA flasks, keep your eye level with the meniscus for accurate reading.
Transfer the solution to a storage bottle promptly — do not store solutions in volumetric flasks long-term.
Calibrate the flask annually (gravimetric water method) to verify accuracy.

Care & Notes

Show care & notes

⚠️ Safety & Compliance Checklist

Volumetric Accuracy

Temperature stability is critical — operate at constant temperature

Chemical Safety

HF-containing samples must be handled in a fume hood with proper PPE

Calibration Standards

Volumetric flasks should be calibrated regularly per ISO standards

Compliance

All volumetric operations should follow ISO and laboratory quality management system requirements

PTFE Volumetric Flask