Class A Acid Burette with PTFE Stopcock, made of Borosilicate 3.3. 4 standard sizes.
Check the item is clean and free of cracks or chips before use; do not heat it, keep it away from heat sources and avoid mechanical impact; specifications are subject to quotation.
BRAND IDENTITY
Vissal® is RichTech's own brand; RichTech is the company mark. Both are used together for this product's brand identification.
The following are common specifications. Custom joint combinations available upon request.
Request custom specs| Specification | Material |
|---|---|
| 10ml | Borosilicate 3.3 |
| 25ml | Borosilicate 3.3 |
| 50ml | Borosilicate 3.3 |
| 100ml | Borosilicate 3.3 |
The Class A Acid Burette with PTFE Stopcock belongs to our burette range and is mainly used for delivering titrant dropwise with accurate volume reading. Standard sizes cover 10ml~100ml. For acid-base, redox, complexometric and precipitation titrations.
The body is made of polytetrafluoroethylene (PTFE); highest chemical inertness among common plastics, virtually no swelling or leaching. It works between -196℃ to 260℃, short-term up to 300℃; chemically it resists hydrofluoric acid, aqua regia, concentrated sulfuric and nitric acid, strong alkali and organic solvents; only molten alkali metals and elemental fluorine attack it; very low surface energy, non-stick, minimal sample retention. Surface condition and residue are easy to verify, so cleaning completeness is obvious.
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.
Parts are compression or isostatic moulded from virgin PTFE resin, sintered in a stepped heating cycle; sealing faces finish-machined then lapped, 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.
Typical applications
Handles controlled delivery in titration and quantitative addition and is a common supporting item in such workflows.
Suited to solution preparation and sample transfer in daily work.
Used for incoming checks and batch-to-batch consistency comparison.
Straightforward structure and low operating threshold suit demonstrations and onboarding.
Carries material between weighing, dissolving, transfer and make-up, cutting cross-contamination and losses.
In method development it supports replicate runs with one consistent vessel format, reducing systematic error.
Choose by duty
Define the handling method, contact medium and temperature range before choosing material and interface.
Confirm the interface form before pairing with other apparatus; mismatches leak or will not assemble.
Choose material according to the contact medium and operating temperature; refer to the specification block.
Non-standard sizes, special interfaces or volume customisation are quoted separately.
Match size to the volume per run and the number of runs a day; oversize vessels add cleaning load, undersize ones force repeated batches.
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 or hot storage | Suitable | strong acids, alkalis and organic solvents for long contact |
| Heating and high temperature | Suitable | -196℃ to 260℃, up to 300℃ short-term |
| Direct flame | Not suitable | decomposes above 300℃ releasing harmful fumes |
| Vacuum service | Suitable | the material is inert; sealing depends on the design |
| Hydrofluoric acid / fluorides | Suitable | one of the few materials that resists HF |
| Strong oxidizing media | Suitable | resists aqua regia, concentrated sulfuric and nitric acid |
| Autoclaving | Conditional | 121℃ is fine, but repeated cycles accelerate ageing |
| Trace metal analysis | Suitable | low leaching, suited to trace and ultra-trace work |
Standard procedure
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.
Assemble as required for controlled delivery and confirm the connection is secure.
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.
Do not heat this item: no flame drying and no high-temperature oven drying.
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.
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.
Store without stacking or impact, in a ventilated and dry place; long stacking deforms the base, and volumetric ware should stand on its own.
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.
Keep a usage log with the commissioning date, media contacted and cleaning method, so replacement timing and traceability stay clear.
⚠️ Safety & handling notes
Never flame-dry or oven-dry at high temperature; keep away from hot plates and heat sources.
Avoid impact, dropping and scratching; never carry by a thin or weak section.
Clean immediately after use; dried residues are harder to remove. Avoid abrasive cleaning tools.
Air-dry or dry at low temperature; volumetric ware must never be oven-dried.
Check for cracks, deformation and seal failure after long use and replace when needed.
Items should carry a clear label and usage record; mixed use makes cleaning history and media contact untraceable.
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.
Need spec confirmation or bulk pricing?
Request a Quote