Builders, Additives & Specialty Chemicals Database

Builders reduce water hardness, maintain wash alkalinity, and enhance surfactant efficiency. The seven builders profiled here account for the majority of builder tonnage in laundry and institutional detergents.

CAS number: 497-19-8 Trade names: Soda ash light, soda ash dense, Solvay soda Formula: Physical form: White crystalline powder; light grade ~100–300 µm, dense grade ~500–1000 µm Color/odor: White; odorless pH: 11.5–11.8 (1%, 25 °C) Key specifications. Bulk density: 600–800 g/L (light) ; 900–1100 g/L (dense). Purity: ≥99.0%. Water solubility: 215 g/L at 20 °C . Iron: ≤10 ppm. Loss on ignition: ≤0.5%.

Function. Sodium carbonate is a precipitating builder that reacts with Ca²⁺ and Mg²⁺ to form insoluble carbonates, removing hardness from wash water. Its high alkalinity (pH 11–12) promotes saponification of fatty soils and enhances anionic surfactant performance .

Typical dosage: 10–30% in laundry powders; 5–15% in dishwasher powders .

Compatibility. Incompatible with acids (CO₂ evolution). Compatible with zeolites, silicates, percarbonate, and enzymes. Co-builders (citrate, polycarboxylates) recommended to mitigate CaCO₃ deposition above 60 °C .

Storage. Store dry; hygroscopic. Shelf life: indefinite under dry conditions.

Safety. Irritant to eyes and skin. NFPA 704: Health 2, Flammability 0, Reactivity 0 .

CAS number: 144-55-8 Trade names: Baking soda, sodium hydrogen carbonate Formula: Physical form: Fine white crystalline powder, 50–200 µm Color/odor: White; odorless pH: 8.3 (1%, 25 °C) Key specifications. Bulk density: 800–1100 g/L. Purity: ≥99.0%. Decomposition: begins at 50–60 °C releasing CO₂. Water solubility: 96 g/L at 20 °C .

Function. Provides mild alkalinity (pH ~8.3) for delicate-fiber detergents. Functions as an odor absorber by disrupting hydrogen bonding between VOCs and fabric surfaces . Particles provide mild mechanical abrasion; thermal decomposition releases CO₂ that aids soil loosening .

Typical dosage: 5–15% in powder laundry; 3–10% in carpet cleaners .

Compatibility. Decomposes with acids. Stable with surfactants, zeolites, silicates. Buffers hypochlorite in the effective pH 9–11 range .

Storage. Store dry, sealed; decomposes above 50 °C. Shelf life: 2 years.

Safety. GRAS (21 CFR 184.1736). Non-hazardous .

CAS number: 7757-82-6 Trade names: Salt cake, thenardite Formula: Physical form: White crystalline powder or granules Color/odor: White; odorless pH: 6.0–8.0 (5%, 25 °C) Key specifications. Bulk density: 0.70–1.10 g/cm³ . Purity: ≥99.0%. Water solubility: 195 g/L at 20 °C . Moisture: ≤0.1%.

Function. Primarily a cost-effective filler and processing aid in powder detergents. Improves flowability, reduces dusting, and controls bulk density. Enhances anionic surfactant performance and acts as a slurry thinner in spray-drying .

Typical dosage: 10–40% in conventional powder laundry detergents; not used in liquids .

Compatibility. Compatible with all detergent ingredients. Non-hygroscopic .

Storage. Store dry. Non-hygroscopic. Shelf life: indefinite.

Safety. Non-hazardous. NFPA 704: Health 0, Flammability 0, Reactivity 0 .

CAS number: 1344-09-8 Trade names: Waterglass, Kalusil, Britesil Formula: ; = 1.6–3.3 for detergent grades Physical form: Viscous liquid (typical), glassy solid, or hydrated powder Color/odor: Clear to pale green liquid; odorless pH: 11.0–13.0 (1%) Key specifications. The SiO₂:Na₂O ratio determines performance: low ratios (<2.5) give higher alkalinity for heavy-duty cleaners; high ratios (>3.0) provide lower alkalinity with more corrosion protection . Typical detergent grade: 38–42% solids, ratio 2.0–2.4. Density: 1.38–1.52 g/mL (liquid).

Function. Precipitates hardness ions as silicates. Deposits a silica film on metal surfaces for corrosion inhibition . Buffers pH, stabilizes peroxide bleaches by chelating transition metals, and aids soil suspension .

Typical dosage: 3–15% in laundry powders; 2–8% in dishwasher detergents .

Compatibility. Incompatible with acids (gelation). Incompatible with aluminum containers (etches Al at pH >11). Stable with bleaches and enzymes.

Storage. Liquid: 5–40 °C, protect from freezing. Shelf life: 12 months (liquid).

Safety. Caustic. NFPA 704: Health 3, Flammability 0, Reactivity 0 .

CAS number: 1318-02-1 Trade names: Wessalith, Doucil, Zeosorb Formula: Physical form: White free-flowing powder, 2–5 µm Color/odor: White; odorless pH: 10.0–11.5 (1% suspension) Key specifications. Calcium exchange capacity (CEC): ≥310 mg CaCO₃/g . Whiteness: ≥95%. Al₂O₃: ≥34%. Bulk density: 350–450 g/L .

Function. Ion-exchange builder capturing Ca²⁺ and Mg²⁺ in its microporous framework. The dominant builder in phosphate-free laundry detergents . Also acts as a liquid surfactant carrier and provides mild anti-redeposition .

Typical dosage: 15–25% in compact phosphate-free laundry detergents .

Compatibility. Insoluble residue requires adequate rinsing. Co-builders (polycarboxylates, citrate) prevent calcium-zeolite agglomerates on fabrics. Not suitable as sole builder in liquid detergents .

Storage. Store dry; hygroscopic. RH <60%. Shelf life: 24 months.

Safety. Non-toxic. NFPA 704: Health 0, Flammability 0, Reactivity 0 .

CAS number: 7758-29-4 Trade names: STPP, Thermophos Formula: Physical form: White free-flowing powder or granules (Phase I or II) Color/odor: White; odorless pH: 9.2–10.0 (1%) Key specifications. Purity: ≥94.0%. Builder value: 15–17 . Calcium sequestration: 1:1 stoichiometric complex. Density: 2.52 g/cm³. Water solubility: ~150 g/L at 25 °C .

Function. Benchmark sequestering builder forming water-soluble Ca²⁺/Mg²⁺ complexes. Disperses particulate soils, prevents redeposition, and buffers wash liquor at pH 9–10 . Builder value exceeds zeolites (~12–14), citrates (~8–10), and carbonates (~5–8) .

Typical dosage: 15–35% where permitted; 0% in phosphate-free regions .

Compatibility. Hydrolyzes slowly to orthophosphate. Limited/banned in EU (Regulation 473/2002) and several US states due to eutrophication .

Storage. Store dry, sealed; hygroscopic. Shelf life: 12 months.

Safety. Aquatic eutrophication hazard (H412). NFPA 704: Health 1, Flammability 0, Reactivity 0 .

CAS number: 68-04-2 (anhydrous); 6132-04-3 (dihydrate) Trade names: Citrosodine, E331 Formula: Physical form: White crystalline granules or powder Color/odor: White; odorless pH: 7.5–9.0 (5%) Key specifications. Purity: ≥99.0%. Water solubility: ~770 g/L at 25 °C . Readily biodegradable per OECD 301B (>60% DOC removal) .

Function. Biodegradable chelant forming soluble complexes with Ca²⁺, Mg²⁺, and transition metals. Stabilizes peroxide bleaches and buffers pH 7.5–9.0, compatible with enzyme activity . FDA GRAS and EPA SCIL listed .

Typical dosage: 5–15% in liquid detergents; 3–10% in powder eco-formulations .

Compatibility. Compatible with surfactants, enzymes, percarbonate. Chelation efficiency decreases above pH 11; combine with polycarboxylates for alkaline systems .

Storage. Slightly hygroscopic. Shelf life: 3 years.

Safety. Non-hazardous. NFPA 704: Health 0, Flammability 0, Reactivity 0 .

Polymeric additives in detergent formulations serve functions distinct from surfactants and builders. They prevent soil redeposition onto fabric during washing, act as dispersants for particulate soils, provide viscosity control in liquid products, and contribute to formulation stability. The three polymers profiled here—CMC, sodium polyacrylate, and HEC—represent the most widely used non-surfactant polymeric additives in detergent manufacturing. Selection between these polymers depends primarily on formulation pH and electrolyte content: CMC for moderate pH and electrolyte, sodium polyacrylate for high-hardness and high-pH systems, and HEC for non-ionic or cationic liquid formulations where salt tolerance is essential.

CAS number: 9004-32-4 Trade names: Akucell, Finnfix, Walocel Formula: Physical form: White free-flowing powder Color/odor: White; odorless pH: 6.5–8.5 (1%) Key specifications. DS: 0.7–0.9 (standard grade). Purity: ≥95%. Viscosity (1%): 1000–5000 cP . Loss on drying: ≤10% .

Function. Anti-redeposition polymer; carboxymethyl groups adsorb onto fabric and soil surfaces, creating an electrostatic barrier against soil redeposition . DS 0.7–0.9 optimizes water solubility and charge density .

Typical dosage: 0.5–2.0% in powders; 0.3–1.0% in liquids .

Compatibility. Compatible with anionic/nonionic surfactants. Precipitates with polyvalent cations or very high electrolyte; low-DS grades preferred for high-builder formulations . Maximum viscosity at pH 6–9 .

Storage. Store dry; hygroscopic. Shelf life: 24 months.

Safety. Non-toxic. Food additive E466. NFPA 704: Health 0, Flammability 1, Reactivity 0 .

CAS number: 9003-04-7 Trade names: Acusol, Sokalan PA, Alcosperse Formula: Physical form: White powder or clear viscous liquid (40–45% solids) Color/odor: White/clear; odorless pH: 7.0–9.0 (1%) Key specifications. Mw ranges by function: 4000–5000 (threshold inhibitor); 10,000–30,000 (anti-redeposition); >50,000 (thickener). Residual monomer: ≤500 ppm .

Function. Low-Mw grades inhibit crystal growth at substoichiometric concentrations . Medium-Mw grades provide anti-redeposition with superior calcium tolerance versus CMC . High-Mw grades thicken liquid detergents.

Typical dosage: 1–3% (threshold/dispersant); 0.5–2% (anti-redeposition) .

Compatibility. Excellent Ca tolerance (>300 ppm CaCO₃). Synergistic with zeolites: polycarboxylates prevent calcium-zeolite deposits on fabrics while zeolites provide bulk ion exchange. Incompatible with cationic surfactants (complexation) . In high-hardness formulations (>300 ppm CaCO₃), sodium polyacrylate at 1–2% can replace CMC entirely, providing both threshold inhibition and anti-redeposition in a single additive.

Storage. Liquid: 5–40 °C, protect from freezing. Shelf life: 12–24 months.

Safety. Non-toxic. NFPA 704: Health 1, Flammability 0, Reactivity 0 .

CAS number: 9004-62-0 Trade names: Natrosol, Cellosize, Tylose H Formula: Physical form: White to light tan powder Color/odor: White to off-white; odorless pH: 6.0–8.5 (2%) Key specifications. MS: 1.8–2.5. Viscosity (1%): ~145 cP (low) to >100,000 cP (high) . Moisture: ≤6% .

Function. Non-ionic thickener and rheology modifier. Imparts pseudoplastic flow for easy pouring under shear with suspension stability at rest . Primary role is viscosity control; for anti-redeposition, CMC or polyacrylate are preferred .

Typical dosage: 0.5–2.0% in liquid laundry; 0.3–1.0% in fabric softeners .

Compatibility. Compatible with all surfactant classes including cationics. Stable pH 2–12; maximum viscosity stability at pH 6.5–8.0. Some viscosity loss may occur below pH 3 due to acid hydrolysis of ether linkages. In liquid detergent formulations with high electrolyte content (>10% sodium chloride or carbonate), HEC maintains viscosity where CMC would precipitate. Surface-treated (R-type) grades delay hydration when added to water, reducing lumping and agglomeration during processing .

Storage. Store dry; hygroscopic. Shelf life: 24 months.

Safety. Non-toxic. NFPA 704: Health 0, Flammability 1, Reactivity 0 .

Bleaches oxidize colored stains; enzymes catalyze hydrolysis of specific stain substrates. This section covers oxygen bleach (percarbonate + TAED), chlorine bleach (hypochlorite), and detergent enzyme classes.

CAS number: 15630-89-4 Trade names: Oxyper, SPC Formula: Physical form: White granules (coated or uncoated), 400–1400 µm Color/odor: White; faint peroxide odor pH: 10–11 (1%) Key specifications. Available oxygen: >13.5% (uncoated); >13.0% (coated) . Bulk density: 800–1100 g/L. Solubility: ~140 g/L at 20 °C. Thermal stability (coated): ≥90% AvOx after 48 h at 32 °C, 80% RH .

Function. Releases H₂O₂ and Na₂CO₃ upon dissolution. H₂O₂ oxidizes chromophores in stains (wine, tea, coffee) . Inefficient below 60 °C without bleach activators such as TAED .

Typical dosage: 5–20% in laundry powders; 8–15% in dishwasher powders .

Compatibility. Decomposes with moisture, heat, transition metals. Coated grades use silicate/borate coatings for shelf life . Incompatible with hypochlorite and enzymes (oxidative denaturation) .

Storage. <30 °C, dry. SADT ~71 °C for bulk . Shelf life: 12–18 months (coated).

Safety. Strong oxidizer. NFPA 704: Health 2, Flammability 0, Reactivity 2 (OX) .

CAS number: 7681-52-9 Trade names: Chlorox, bleach liquor Formula: NaOCl (active: OCl⁻) Physical form: Clear yellow-green aqueous solution Color/odor: Pale yellow; chlorine odor pH: 11.0–13.0 (as-supplied) Key specifications. Available chlorine: 5–15%. Decomposition: ~1–2%/month at 25 °C; >5%/month above 35 °C .

Function. OCl⁻ oxidizes chromophores in stains (grass, wine, blood). Provides sanitization at 50–200 ppm available Cl . High alkalinity provides concurrent buffering .

Typical dosage: 1–5% available Cl (institutional laundry); 1–3% (household bleach) .

Compatibility. Degrades rapidly at pH <9 and with transition metals. Incompatible with acids (Cl₂ gas), ammonia (chloramines), peroxides (O₂ evolution), enzymes, and most fragrances . Corrosive to metals; silicate or inhibitors recommended .

Storage. Opaque, corrosion-resistant containers; 5–25 °C. Shelf life: 6–12 months .

Safety. Corrosive. NFPA 704: Health 3, Flammability 0, Reactivity 2 .

CAS number: 10543-57-4 Trade names: Peractive, TAED Formula: Physical form: White crystalline powder or granules Color/odor: White; faint acetic odor pH: 3.0–4.0 (saturated) Key specifications. Purity: ≥98.0%. Active oxygen equivalent: 140 mg O/g. Melting point: 149–154 °C. Water solubility: ~0.2–1 g/L at 20 °C . Biodegradability: >95% DOC removal, OECD 301E .

Function. Bleach activator reacting with H₂O₂ via perhydrolysis to generate peracetic acid in situ, effective at 40–60 °C . Each gram generates 0.67 g peracetic acid; provides two equivalents per molecule . Peracetic acid is hydrophilic, targeting tea, coffee, wine, and fruit juice stains .

Typical dosage: 1–5% in compact laundry powders; 2–4% in dishwasher tablets .

Compatibility. Low solubility aids powder stability. Granulation with CMC and color coating stabilizes against moisture .

Storage. Dry, sealed, <30 °C. Shelf life: 12–18 months.

Safety. Low toxicity; readily biodegradable. LC₅₀ >250 mg/L across aquatic species .

General specifications. Form: brown liquid concentrate, tan granular prills, or tan powder. Moisture: ≤8% (granular). pH optimum: 8–11. Temperature optimum: 20–60 °C. Stabilizers: glycerol, CaCl₂, boron-free systems .

Function. Proteases (~60% of detergent enzyme market) cleave peptide bonds in protein stains . Amylases hydrolyze starch-based stains; thermostable variants survive dishwasher temperatures . Lipases hydrolyze triglycerides after a conformational activation lag at the oil-water interface . Cellulase removes surface microfibrils to restore fabric smoothness and color vibrancy; overdosing (>1%) weakens cotton tensile strength . Mannanase targets guar-based “invisible stains” that cause graying .

Compatibility. Avoid contact with oxidizing bleach during storage. Maintain pH 7.5–11.0. Avoid anionic surfactants >15% active with liquid concentrates. Mg²⁺/Ca²⁺ (1–5 mM) stabilize proteases . In powders, coated granules isolate enzymes from bleach and moisture; in liquids, add after pH adjustment with stabilizers present .

Storage. Granular: ≤25 °C, dry. Liquid: 2–8 °C. Formulated liquids: ≤30 °C, 12–18 months .

Safety. Enzyme dust is a respiratory sensitizer. Use dust-free granules; wear N95 respirator when handling powders .

Specialty additives provide functional benefits beyond cleaning: optical brightening, fragrance delivery, color, foam control, chelation, fabric softening, and pH adjustment. The eight data sheets in this section (16.4.1–16.4.8) cover these specialized components, including a comparative analysis of chelating agents and a surface compatibility matrix for descaling acids.

CAS number: 27344-41-8 Trade names: Tinopal CBS-X, Fluorescent Brightener 351 Formula: Physical form: Yellowish-green crystalline powder Color/odor: Yellowish-green; odorless pH: 6.5–9.0 (1%) Key specifications. λₘₐₓ: ~348–349 nm. E-value: ~1100–1140. Emission: ~435 nm . Solubility: 25 g/L at 25 °C; 300 g/L at 90 °C . Purity: ≥98.5%.

Function. Absorbs UV at ~349 nm and emits blue-violet fluorescence at ~435 nm, optically neutralizing fabric yellowing . Stable to hypochlorite and peroxide bleaches .

Typical dosage: 0.05–0.25% (powders); 0.05–0.40% (liquids) .

Compatibility. Resistant to pH 5–12 and oxidizing/reducing agents. Excessive dosing (>0.5%) causes greenish cast .

Storage. Sealed, cool, dry; protect from UV. Shelf life: 2 years .

Safety. Low toxicity; low bioaccumulation .

Fragrances are complex mixtures of 20–100+ natural essential oils and synthetic aroma chemicals diluted in carriers (DPG, isopropyl myristate) .

Key specifications. Appearance: clear to pale yellow liquid. Specific gravity: 0.85–1.05 g/mL. Flash point: typically >60 °C. Color: ≤5 Gardner.

Function. Masks base odors; provides product identity and consumer preference; deposits on fabrics for lasting freshness .

Typical dosage: 0.2–2.0% in standard laundry; 0.05–0.2% in fragrance-free/sensitive variants; 2–5% in fabric softeners .

Compatibility. Hypochlorite and peracids oxidize many fragrance components; use bleach-stable grades or encapsulation . Some components depress nonionic cloud points. All materials must comply with IFRA standards .

Storage. Sealed, opaque, 5–25 °C. Shelf life: 12–24 months.

Safety. 26 known allergens require EU CLP labeling above thresholds (0.01% rinse-off) .

Colorants provide visual identity; two classes are used: soluble dyes for liquids and insoluble pigments for powders .

Function. Product aesthetics, brand identity, and variant differentiation. Blue/violet dyes provide subtle “bluing” to neutralize yellowing .

Typical dosage: 0.001–0.01% (dyes); 0.01–0.05% (pigments) .

Compatibility. Azo dyes may degrade at pH >10. Most dyes degraded by hypochlorite. EU restricts azo dyes releasing carcinogenic amines (REACH Annex XVII) .

Storage. Sealed, protected from light. Shelf life: 12–24 months.

Safety. Verify heavy metal compliance (EN 71-3) for applicable uses .

CAS number: 1300-72-7 Trade names: SXS-40, Pilot SXS-40 Formula: Physical form: Clear pale yellow liquid (40% active) Color/odor: Clear liquid; mild aromatic odor pH: 7.0–8.5 (40% solution) Key specifications. Active: 39.0–41.0%. Sodium sulfate: ≤2.0%. Density: 1.18–1.20 g/mL. Freezing point: ~3–4 °C; reconstitutable at ~50 °C .

Function. Hydrotrope that solubilizes fragrances, nonionic surfactants, and organic additives in high-electrolyte formulations. Depresses cloud point of nonionic solutions and reduces slurry viscosity .

Typical dosage: 2–8% in liquid laundry; 3–10% in hard-surface cleaners .

Compatibility. Anionic; compatible with all surfactants, alkalis, builders. Readily biodegradable; EPA Safer Choice listed .

Storage. 5–40 °C; protect from freezing. Shelf life: 24 months.

Safety. Low toxicity. NFPA 704: Health 1, Flammability 0, Reactivity 0 .

EDTA (CAS 60-00-4). Log K Ca²⁺: 10.7; Mg²⁺: 8.7; Fe³⁺: 25.1 . Not readily biodegradable (<5% OECD 301). Restricted in EU Ecolabel products; remobilizes heavy metals from sediments .

GLDA (CAS 51981-21-6). Tetrasodium glutamate diacetate. Derived from L-glutamic acid. Log K Ca²⁺: ~8–9. Biodegradability: 74–98% OECD 301B . Calcium capacity: ~450 mg CaCO₃/g active. 100% bio-based. Thermally stable to 170 °C. Replaces EDTA 1:1 in most applications .

MGDA (CAS 135324-87-5). Trisodium methylglycinediacetate. Log K Ca²⁺: ~7–8. Biodegradability: ~68% OECD 301B . Superior Fe³⁺ chelation at alkaline pH. Stable to >200 °C. Excellent peroxide bleach stabilizer.

For maximum chelation where environmental constraints permit, EDTA remains the most cost-effective option on an active basis. However, for formulations targeting eco-labels or markets with chelator restrictions, GLDA offers the best balance of chelation performance and environmental profile, with 100% bio-based content and the highest biodegradability. MGDA excels in bleach stabilization applications where iron control at alkaline pH is critical, and its superior thermal stability (>200 °C) makes it suitable for high-temperature institutional laundry and automatic dishwashing. In practice, GLDA can replace EDTA at 1:1 to 1:1.2 mass ratios depending on hardness level and pH, with minimal formulation adjustment required . All three chelators are incompatible with cationic surfactants at high concentrations (complexation precipitation).

Safety. EDTA: H319 (eye irritation). GLDA: non-hazardous; does not sensitize skin. MGDA: H315 (skin irritation), H319 (eye irritation) .

CAS number: 9016-00-6 (PDMS) Trade names: Dow AF, Rhodorsil, Tego Antifoam Formula: Physical form: White emulsion (10–30%), viscous compound (100%), or powder on carrier pH: 6.0–8.0 (emulsion) Key specifications. Silicone content: 10–100% by type. Oil viscosity: 10,000–100,000 cSt. Emulsion stability: ≥6 months at 5–40 °C.

Function. Controls foam in processing and end-use. Low-surface-tension silicone droplets spread across foam lamellae, causing rupture .

Typical dosage: 0.1–1.0% (emulsion); 0.5–2.0% (powder) .

Compatibility. Emulsions must resist formulation shear. In powders, pre-absorption on carrier prevents fabric spotting .

Storage. Emulsion: 5–40 °C, do not freeze. Shelf life: 6–24 months.

Safety. Non-toxic. NFPA 704: Health 0, Flammability 0, Reactivity 0 .

CAS number: 91995-81-2 (generic TEAQ) Trade names: Stepantex, Rewoquat, Praepagen Representative formula: Physical form: Viscous pale yellow liquid (80–92% active dispersion) Color/odor: Pale yellow; faint fatty odor pH: 4.0–6.0 (1%) Key specifications. Cationic active: 80–92%. Amine value: ≤5 mg KOH/g. Iodine value: ≤1 (saturated). Biodegradability: >80% OECD 301B .

Function. Cationic fabric softener adsorbing onto negatively charged fabric surfaces. Fatty acid tails lubricate fibers, reducing interfiber friction . Replaced older DHTDMAC types due to superior biodegradability; ester linkages hydrolyze during wastewater treatment .

Typical dosage: 5–20% in liquid fabric softeners; 2–8% in 2-in-1 detergents .

Compatibility. Incompatible with anionic surfactants (waxy precipitate formation). In 2-in-1 detergent formulations, this incompatibility is managed by: (1) using nonionic surfactants exclusively as the cleaning base; (2) encapsulating the esterquat for release in the rinse cycle; or (3) formulating at low electrolyte concentration to maintain a meta-stable dispersion. In hard water (>300 ppm CaCO₃), softening efficacy may be reduced as calcium competes with the cationic head group for fabric adsorption sites .

Storage. 10–35 °C; solidifies below 10 °C. Shelf life: 12 months.

Safety. H315, H319. Moderate aquatic toxicity; rapid biodegradation mitigates risk .

Four acids are commonly used for mineral deposit removal and pH adjustment.

Surface compatibility matrix.

Citric acid is the preferred choice for food-contact equipment, coffee machines, and household descaling due to its mildness and complete biodegradability, though it is slower-acting than mineral acids on heavy scale. Sulfamic acid offers a favorable combination of solid-form handling safety, moderate corrosivity, and broad-scale effectiveness for commercial and light industrial applications. Phosphoric acid is uniquely suited for applications involving ferrous metals where the formation of a protective iron phosphate layer (passivation) is beneficial, such as pre-paint preparation and metal finishing. Hydrochloric acid, while the most aggressive and fastest-acting descaler, requires corrosion inhibitors for virtually all metal surfaces and presents significant handling and ventilation challenges; its use should be limited to heavy industrial descaling where other acids are ineffective and where trained personnel and appropriate safety equipment are available . The addition of corrosion inhibitors (typically organic compounds containing nitrogen or sulfur at 0.1–1%) significantly expands the safe-use envelope for sulfamic and hydrochloric acids on ferrous metals and should be considered standard practice in formulated descaling products.

Safety. Citric acid: non-hazardous; mild irritant. Sulfamic acid: H315 (skin irritation), H319 (eye irritation). Phosphoric acid (85%): H314 (causes severe skin burns and eye damage). Hydrochloric acid (37%): H314, H335 (respiratory irritation); fuming; use only in well-ventilated areas .

Table 16.1 consolidates all twenty-one materials, providing a single reference for CAS number, function, dosage, and key quality parameter.

Table 16.1 — Master Summary of All Materials

The master table reveals patterns relevant to formulation practice. Builders constitute the largest mass fraction (30–60% combined in powders), with sodium carbonate and zeolite A as the backbone of phosphate-free systems, while STPP remains most efficient where permitted. Polymeric additives at fractional percentages provide disproportionate performance benefits: CMC for moderate-pH anti-redeposition, sodium polyacrylate for high-hardness dispersion, and HEC for non-ionic liquid rheology. The bleach-enzyme subsystem requires careful compatibility management—percarbonate with TAED for low-temperature oxygen bleaching, hypochlorite for institutional sanitization (never combined with enzymes), and enzymes requiring stabilization against both bleach types. Specialty additives at very low loadings (0.001–2%) provide significant consumer-perceptible benefits: optical brightening, fragrance, and color differentiate products at point of sale. The chelator comparison highlights the industry transition from EDTA to GLDA and MGDA, driven by regulatory pressure, with GLDA offering the strongest environmental profile and nearest performance parity to EDTA.

Table 16.2 — Builder Calcium Binding Comparison

STPP and EDTA, the highest-capacity builders, face the most stringent regulatory restrictions. GLDA approaches STPP/EDTA capacity (450 vs. 500 mg CaCO₃/g) while offering ready biodegradability and 100% bio-based content, making it the preferred replacement in eco-label formulations. Sodium carbonate operates through precipitation rather than sequestration, generating insoluble CaCO₃ that can deposit on fabrics without co-builders. Multi-builder systems (e.g., zeolite + polycarboxylate + citrate) typically deliver the best overall balance.

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