Potassium tetrafluoroborate

CAS: 14075-53-7

Overview

Potassium tetrafluoroborate (CAS 14075-53-7 ), also known as potassium fluoborate and abbreviated KBF4, is an inorganic fluoroborate salt used across metallurgy, electronics, and surface treatment industries.

It functions primarily as a flux agent, grain refiner, and controlled fluoride source in high-temperature processing applications. In aluminum and magnesium casting, KBF4 acts as a grain-refining additive.

This improves the mechanical properties of finished metal components. Electronics manufacturers use it as a flux component in soldering pastes and brazing alloys, where controlled fluoride release aids oxide removal.

In abrasives production, it is incorporated into grinding wheels and coated abrasives as an active filler. This reduces heat buildup and extends tool life during intensive metalworking operations.

Surface treatment and electroplating operations also draw on potassium fluoroborate as a fluoride donor. It is used in bath formulations for metal finishing processes to ensure high-quality results.

Potassium tetrafluoroborate is supplied as a white crystalline powder or fine granules. Technical grade is the standard commercial form, with purity levels typically ranging from 98% to 99%+.

High-purity grades are available for electronics and specialty metallurgical applications. Consistent fluoride content and low impurity profiles are critical to process control in these sectors.

Physical Properties

Melting Point	530 °C
Density	2.554-2.559 g/cm³ @ Temp: 15 °C
Appearance	white odourlesss crystalline powder
Color	White to light gray
Odor	wh. odorless cryst.
Form	Micro-Crystalline Powder
Water Solubility	4.4 g/L (20 ºC)
Refractive Index	1.3245

Safety & Handling

Warning GHS07 GHS08 Hazard Statements H315 Causes skin irritation H319 Causes serious eye irritation H335 May cause respiratory irritation H372 Causes damage to organs through prolonged or repeated exposure H413 May cause long lasting harmful effects to aquatic life Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code	28269090
Storage Class	11 - Combustible Solids
WGK (Germany)	1

Other Names

Industries

Water Treatment Electronics Mining & Metals