Coatings & Additives

Sulfamic Acid for Chloride-Free Pickling vs Hydrochloric Acid Pickling and descaling remove oxide, rust and scale from steel and equipment – and the traditional acid for the job is hydrochloric acid. But hydrochloric acid brings chlorides, fuming, and a real risk of pitting and stress-corrosion cracking on stainless steel. Sulfamic acid (CAS 5329-14-6) offers a

Phosphoric Acid in Metal Phosphating and Surface Treatment Phosphating is one of the largest industrial uses of phosphoric acid. In the process, phosphoric acid reacts with the metal surface (and with dissolved metal ions in the bath) to form an adherent, crystalline phosphate conversion coating. That coating improves paint adhesion, slows corrosion and provides a

Buying TMAU: What Matters Tetramethylol acetylenediurea (TMAU, CAS 5395-50-6) is a formaldehyde-based crosslinker supplied as a solid or an aqueous solution. Buying it well means confirming the identity (and the correct chemistry behind the misleading name), checking the assay and the all-important free-formaldehyde figure, and matching the form and grade to your process. For the

TMAU in Textile Finishing Tetramethylol acetylenediurea (TMAU, CAS 5395-50-6) is a formaldehyde-based crosslinker used to give cotton and other cellulosic fabrics durable-press, wrinkle-resistant and “easy-care” properties. It belongs to the family of methylol crosslinkers that includes the classic DMDHEU, and it competes with them on performance, fabric hand and formaldehyde release. For the full chemistry

Buying Antioxidant 168 (Irgafos 168): What Matters Antioxidant 168 (CAS 31570-04-4) is a commodity-scale polymer additive, but two suppliers offering the same headline assay can differ in the parameters that actually matter — transmittance, free DTBP, acid value and hydrolytic stability. Because the material is a moisture-sensitive phosphite, buying it well means specifying those parameters

Antioxidant 168 and Irganox 1010: How Phosphite and Phenolic Antioxidants Work Together In polymer stabilisation, the two most important antioxidants are of fundamentally different types. Antioxidant 168 (Irgafos 168, a phosphite) is a secondary antioxidant; Irganox 1010 (a hindered phenol) is a primary antioxidant. Used together, they form the stabiliser system behind an enormous share

Buying Antioxidant 7PPD: What Matters Antioxidant 7PPD (CAS 3081-01-4) is a liquid rubber antiozonant, and buying it well means getting the identity right, matching the specification to the compound, and securing the documentation that goes with a hazardous industrial chemical. This guide sets out what to check. For the chemistry and applications behind these points,

7PPD vs 6PPD: An Overview 6PPD and 7PPD are the two best-known members of the substituted p-phenylenediamine (PPD) family of rubber antiozonants. They look similar, do the same job, and are often discussed together — but they are different substances with different CAS numbers, different alkyl groups, different ketone feedstocks and, increasingly, different regulatory profiles.

SIS in Hot-Melt Adhesives and Sealants Styrene-isoprene-styrene (SIS) block copolymer is the base elastomer behind a large share of the world’s hot-melt and pressure-sensitive adhesives. Its combination of high tack, good adhesion, elastic recovery and easy melt processing is hard to match, and it has made SIS the reference polymer for labels, tapes, disposable hygiene

Dicyandiamide as a Latent Epoxy Curing Agent Dicyandiamide (DCD; CAS 461-58-5) is the workhorse latent curing agent for epoxy resins. Its defining property is latency: a mixture of epoxy resin and dicyandiamide is stable at room temperature, often for months, but cures rapidly when heated. That behaviour is the basis of one-part epoxy adhesives, coatings,