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They are closely related, but are not always identical in practice. HF is the chemical formula of the hydrogen fluoride molecule. However, the term "hydrofluoric acid" generally refers to hydrogen fluoride dissolved in water (aqueous HF). This can lead to confusion, as in some databases, the CAS/SciFinder nomenclature may refer to the HF molecule as "hydrofluoric acid", even when it is not an aqueous solution.

These are terms frequently used to describe HF solutions and their quality level. wt% (weight percentage) is the most common format for industrial HF. It indicates the quantity of HF by mass in the solution. Example: HF 49 wt% means 49 g of HF per 100 g of solution (the remainder being mainly water). w/v% (mass/volume percentage) indicates the quantity of HF by mass per volume of solution. Example: HF 10 w/v% means 10 g HF per 100 mL solution.

Concentration indicates how much HF is present in the mixture (its "strength"), e.g. 49 wt% or 70 wt%. Purity indicates the level of contamination (its "cleanliness"). Typical impurities may include water, dissolved metals, chlorides, sulfates and particulates. Thus, we can have a high-purity HF 49 wt% (very low impurity content) or a lower-purity HF 49 wt% (more contaminants). In short: concentration = strength, purity = cleanliness.

Both are possible, depending on process conditions and sampling objective. Hydrogen fluoride has a boiling point close to room temperature (~19.5°C): it can therefore be in liquid or gaseous form, depending on temperature and pressure. AHF (anhydrous hydrogen fluoride) is often handled and withdrawn as a liquefied gas/liquid under pressure in industrial plants. HF (aqueous hydrofluoric acid) is generally collected in liquid form, as it is HF dissolved in water.

Hydrogen fluoride (HF) sampling is one of the most critical points in an industrial process. It represents a major challenge, as it requires temporarily breaking the containment of a highly monitored process line.

These products are extremely toxic and corrosive. Simple exposure can cause deep burns, systemic damage or death. Sampling must be carried out using closed, certified, HF-resistant systems, according to strict protocols

BIAR solutions are also used in:A) oil refining (alkylation) ｜B) production of fluorochemicals and coolants ｜C) electronics industry (etching) ｜D) nuclear power (UF₆ conversion, zirconium pickling) ｜E) metallurgy (surface treatment, aluminum)

No. Solutions vary according to: A) acid concentration (5% to 99.9%) ｜ B) production and sampling parameters (pressure / temperature / frequency)｜C) safety requirements.

This depends on the concentration of the product to be sampled, the sampling parameters and the safety requirements of the site; BIAR offers double-chamber containers for neutralizing the sample before transport or analysis.

Anhydrous HF (AHF) is a highly volatile product, whose vapour pressure rises rapidly with temperature. Sampling in a container with ice helps to reduce product temperature, reduce evaporation and limit the release of toxic vapors during short-term handling. Cooling also helps to limit the thermal effects of any traces of moisture. This method can be used in certain contexts, but does not replace good sampling practices in closed systems.

Thanks to its modular range, BIAR offers solutions tailored to your constraints (pressure, temperature, toxicity, sampling frequency). Our experts will help you choose the safest, most accurate solution for your process.

HF-resistant materials such as Monel, Hastelloy C-276 and PFA are recommended, depending on concentration, temperature and process conditions

Alloy bellows-sealed leak-control valves combined with bellows-sealed alligator containers or PFA-coated valves with syringes or PFA-coated containers are perfectly suited to AHF sampling. These solutions enable closed, secure, contamination-free sampling.

Yes, BIAR sampling systems comply with the recommendations and guidelines of these organizations, guaranteeing maximum conformity.