Product Description

1. Overview

The Three Neck Flask (Oblique / Straight Neck) belongs to our flask range and is mainly used for routine laboratory work. Standard sizes cover 100ml~5000ml. For daily preparation, transfer and support work.

chemically it resists water, acids, salt solutions and most organic solvents; smooth transparent wall, low adhesion. Level, interface and residue are easy to read, keeping transfer errors small.

When selecting, confirm medium, temperature and connection first, then fix the size: the medium decides the material, the temperature decides whether heating or autoclaving is possible, and the connection decides whether it mates with existing apparatus. For duties outside the normal range — hot concentrated alkali, fluoride media, vacuum or repeated thermal cycling — our engineers can confirm a suitable option.

2. Key properties

Surface: smooth transparent wall, low adhesion
Size range: 100ml~5000ml

3. Manufacturing and inspection

joints and sealing faces ground in pairs, keeping items of the same size interchangeable. Work is carried out at controlled stations to prevent scratches and cross-contamination.

Each item is checked for appearance, dimensions and fit before dispatch; sampling covers capacity or graduation deviation, joint fit and wall uniformity. Items from the same batch stay consistent in size and feel, which simplifies central storage and reordering. Inspection records and batch information are available with the goods.

Applications

Typical applications

Purpose by model

This category covers many items with differing duties; refer to the specific model and quotation.

Daily laboratory work

Suited to daily sampling, handling and pairing.

Confirm duty first

Define the medium, handling method and interface before choosing a model.

Set-up building and modification

Connects, diverts and reduces so that parts with different joints form a complete train.

Gas and liquid path control

Handles on-off, splitting and regulation as a common node in gas and dropping circuits.

Teaching and training

Clear structure makes it easy to explain connection order and handling.

Selection Guide

Choose by duty

Interface must match

Confirm the interface form before pairing with other apparatus; mismatches leak or will not assemble.

Material by medium

Choose material according to the contact medium and operating temperature; refer to the specification block.

Special requirements on request

Non-standard sizes, special interfaces or volume customisation are quoted separately.

Size versus throughput

Match size to the volume per run and the number of runs a day; oversize vessels add cleaning load, undersize ones force repeated batches.

Reading accuracy needed

Choose graduated or single-mark items when accurate metering matters; skip the accuracy premium for rough transfer work.

Service condition guide

Condition	Suitability	Notes
Ambient storage and transfer	Suitable	acids, salt solutions and organic solvents for long contact
Water bath or heating mantle	Suitable	heat gradually to avoid local overheating
Direct flame	Conditional	use a wire gauze or mantle, never heat dry
Rapid heating or cooling	Conditional	keep single-step shock within 120℃; thick walls need slower ramps
Vacuum service	Conditional	only heavy-wall or purpose-made items; thin walls are not recommended
Hydrofluoric acid / fluorides	Not suitable	attacks the glass matrix; use PTFE or PP instead
Hot concentrated alkali or phosphoric acid	Not suitable	prolonged contact etches the surface
Autoclaving	Suitable	standard 121℃ cycle with moderate ramp rates

Usage Guide

Standard procedure

Step 01

Inspect for cleanliness, cracks and chipped edges before use; a crack spreads quickly under heat or load, so retire the item at once and never patch it.

Step 02

Assemble as required for various laboratory operations and confirm the connection is secure.

Step 03

Pour or transfer slowly along the wall to avoid impact on the base and splashing; with volatile or foaming media a slow stream cuts losses and cross-contamination.

Step 04

Clean promptly after use and choose the drying method according to the material; soak stubborn residues first and never scrape the wall with hard tools.

Step 05

Before first use, clean according to the material; soak in dilute acid where appropriate, rinse thoroughly and dry. New items may carry processing aids, so clean before contact with samples.

Step 06

Store without stacking or impact, in a ventilated and dry place; long stacking deforms the base, and volumetric ware should stand on its own.

Step 07

Keep one batch together and label different sizes separately to avoid picking the wrong item; once mixed, the batch is hard to identify when a problem appears.

Step 08

Keep a usage log with the commissioning date, media contacted and cleaning method, so replacement timing and traceability stay clear.

Maintenance & Notes

⚠️ Safety & handling notes

Avoid thermal shock

Sudden temperature changes create stress, especially in thick walls and wide openings; heat and cool gradually.

Prevent mechanical damage

Avoid impact, dropping and scratching; never carry by a thin or weak section.

Clean promptly

Clean immediately after use; dried residues are harder to remove. Avoid abrasive cleaning tools.

Drying by material

Air-dry or dry at low temperature; volumetric ware must never be oven-dried.

Periodic inspection

Check for cracks, deformation and seal failure after long use and replace when needed.

Identification and traceability

Items should carry a clear label and usage record; mixed use makes cleaning history and media contact untraceable.

Retirement criteria

Stop using an item for critical work once it is cracked, chipped, worn at the graduations or leaking; never patch and return it to service.

Three Neck Flask (Oblique / Straight Neck)