TECHNICAL INSIGHTS

Sodium bicarbonate is one compound sold as four different products. The chemistry is identical; what separates technical, feed, food and pharmaceutical grade is what is allowed to be in the remainder — and that decides both price and whether the material is usable at all. ​ ​ ​ ​ Sodium bicarbonate has an unusually wide range of uses for a single compound. The same NaHCO3 ends up in a flue gas duct, a dairy cow's feed, a bakery, and a dialysis clinic. What changes between them is not the chemistry. It is the specification around it. TECHNICAL GRADE The largest volume category, and the most price-sensitive. Flue gas treatment. Injected as a dry powder into the duct, where it decomposes and captures HCl and SO2. Used on waste incinerators, industrial boilers and process heaters. Detergents and cleaning products. As a mild alkali, buffer and

A sink roll runs inside the pot on a continuous coating line, fully submerged in molten metal. This guide covers what attacks it, why the bearings usually go first, and what to specify when ordering a replacement. A sink roll sits at the bottom of the pot on a continuous coating line, fully submerged in molten metal. Its job is simple to describe: the steel strip enters the bath travelling downward, wraps around the sink roll, and leaves travelling upward toward the air knives. Everything difficult about the component follows from where it has to do that job. WHY THE POT IS A HOSTILE PLACE Molten zinc at around 460°C dissolves iron. Any iron-based alloy placed in the bath is under continuous chemical attack, and the reaction products do not simply disappear — they form intermetallic compounds that circulate through the bath as dross. Bath

Radiant tubes let a furnace burn fuel without letting combustion gas touch the product. This guide explains how they work, why atmosphere control depends on them, the common failure modes, and what to check when specifying a replacement. A radiant tube is a closed metal tube that houses a burner flame inside a furnace, transferring heat to the workpiece by radiation from the tube wall rather than by direct contact with combustion gas. The distinction matters more than it first appears. In a directly fired furnace, the burner flame and its combustion products are in the same space as the product. That is efficient and simple, but it means the furnace atmosphere is whatever the burner produces. For any process that requires a controlled atmosphere, that is unacceptable — and this is the problem radiant tubes exist to solve. HOW A RADIANT TU

Temperature alone does not determine the right alloy. This guide covers the four degradation mechanisms that actually kill high-temperature castings, what each alloying element does, and why more nickel is not always better. Buyers specifying high-temperature castings often start and stop with one number: the operating temperature. It is the obvious question, but on its own it is not enough to choose an alloy. Two components running at the same 1,000°C can require entirely different compositions depending on the furnace atmosphere, the load, and how often the part is heated and cooled. This guide covers what actually determines alloy selection. FOUR MECHANISMS THAT END COMPONENT LIFE Oxidation. Above roughly 600°C, the surface reacts with oxygen and forms scale. Chromium is the defence: it forms a dense, adherent Cr2O3 layer that slows fu

A practical comparison of static and centrifugal casting for furnace and petrochemical components — how each process works, what it does to material properties, and which one to specify. When sourcing cast components for furnaces, petrochemical plants or heavy machinery, the casting process matters as much as the alloy. Two components made from the same grade of heat-resistant steel can perform very differently depending on how they were cast. This guide explains the practical differences between static casting and centrifugal casting, and when each is the right choice. HOW STATIC CASTING WORKS In static casting, molten metal is poured into a stationary mould and fills the cavity under gravity alone. Cores can be placed inside the mould to form internal passages, flanges, ribs and other features. Because the mould does not move, static ca