Caustic soda, soda ash, sodium silicates, and monoethanolamine for raising pH, saponifying grease, and softening hard water in laundry, degreaser, and industrial cleaning formulations.
Alkaline builders are the high-pH actives in a cleaning formula that raise andnhold pH, saponify fats and oils into rinsable soaps, and soften water so surfactants keepnworking in hard water. They range from strong inorganic alkalis (sodium hydroxide,nthe silicates) through carbonate builders (soda ash) to amine alkalis (monoethanolamine).nChoose the builder by how much free alkalinity the soil needs and how sensitive thensubstrate is.
nnFree caustic is the most aggressive grease-cutter and the hardest on substrates. Sodiumnhydroxide saponifies baked-on grease in oven and drain products, but it pits aluminum andngalvanized metal and demands careful handling. Monoethanolamine is the amine alkali thatnsaponifies grease at much lower free-caustic levels, so it is the safer choice for floornstrippers and degreasers used on mixed substrates, at a higher raw-material cost. Thatncost-versus-substrate-safety call defines the category.
nnThe silicates do double duty: sodium silicate and sodium metasilicate add alkalinitynwhile also inhibiting corrosion of metal surfaces and soft-metal machine parts, which is whynthey appear in laundry powders and metal-safe industrial cleaners. Soda ash is the low-costncarbonate builder for water softening and powder laundry. For high-alkalinity industrialncompounds, specify anhydrous sodium metasilicate; for general pH buffering, soda ash isnenough.
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