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Send EmailAluminum Chlorohydrate, Aluminum Chlorohydroxide, Aluminum Hydroxychloride, Locron P, Locron L , 12042-91-0
Chemical Name: Aluminum Chlorohydrate, Aluminum Hydroxychloride, Basic Aluminum Chloride
Synonyms: ACH, Aluminum Hydroxychloride, Aluminum Chloride Hydroxide, Dialuminium Chloride Pentahydroxide, Chlorhydrol
CAS Number: 12042-91-0
Molecular Formula: Al₂Cl(OH)₅ (general formula; also expressed as [Al₂(OH)ₙCl₍₆₋ₙ₎]ₘ due to polymeric structure)
Molecular Weight: 174.45 g/mol (monomer basis)
EC Number (EINECS): 234-933-1 (powder); 215-477-2 (related to solution)
Brand Name: Locron® L (Liquid), Locron® P (Powder) – Archroma / Clariant
| Property | Locron® L (Liquid) | Locron® P (Powder) |
|---|---|---|
| Appearance | Colorless to slightly hazy liquid | White to off-white free-flowing powder |
| Odor | Slight characteristic odor | Odorless |
| Physical state | Liquid (aqueous solution) | Solid (micronized powder) |
| Density (20°C) | ~1.33 g/cm³ | ~2.0–2.2 g/cm³ (true); ~0.8–1.0 g/cm³ (bulk) |
| Particle size | Not applicable (solution) | ≥ 99.5%: max. 40 µm; ~85% < 5 µm |
| pH (15% aqueous solution, 20°C) | 4.0–4.4 | approx. 4.2 |
| pH (as supplied) | 3.5–4.5 | Not applicable (powder) |
| Viscosity (20°C) | Low (5–20 cP) | Not applicable |
| Water solubility | Fully miscible | High (max. ~60% w/w) |
| Alcohol solubility | Soluble in lower alcohols | Limited |
| Active Al₂O₃ equivalent | 23–24% w/w | 45–47% w/w |
| Aluminum content (as Al) | 12–13% w/w | 23–24% w/w |
| Chloride content (as Cl) | 12–13% w/w | ~22–23% w/w |
| OH/Al molar ratio | ~1.7 (basicity 80–85%) | ~1.7 (basicity 80–85%) |
| Parameter | Value / Description |
|---|---|
| Monomeric Al (Alₐ) | Small fraction (<5%) |
| Polymeric Al (Al₁₃ – Keggin ion) | Significant fraction (40–60%) |
| High polymers (Al_c) | Balance (35–55%) |
| Approximate formula | Al₂(OH)₅Cl·2H₂O |
| Basicity | 80–85% |
| Step | Description |
|---|---|
| 1 | Locron (solution or dissolved powder) is applied to the underarm (axilla) |
| 2 | The acidic solution partially dissolves into sweat (pH ~5–6) |
| 3 | At the pH of sweat, aluminum species hydrolyze |
| 4 | Forms a gelatinous precipitate of aluminum hydroxide [Al(OH)₃] |
| 5 | The precipitate physically blocks the eccrine sweat ducts |
| 6 | Sweat secretion is temporarily reduced (not permanent) |
| 7 | The plug dissolves naturally over time (24–72 hours) |
Efficacy Parameters:
Sweat reduction: 40–60% (non-prescription); 70–95% (prescription strength)
Onset of action: 1–2 hours after application
Duration of effect: 24–72 hours
| Parameter | Locron® L (Liquid) | Locron® P (Powder) |
|---|---|---|
| Appearance | Clear to slightly hazy liquid | White to off-white powder |
| Aluminum content (Al, w/w) | 12.2–12.8% | 23.0–24.5% |
| Chloride content (Cl, w/w) | 12.2–12.8% | ~22–23% |
| Al:Cl molar ratio | 1:0.95–1.05 | 1:0.95–1.05 |
| OH/Al ratio | 1.5–2.0 | 1.5–2.0 |
| Density (20°C) | 1.32–1.35 g/cm³ | ~0.8–1.0 g/cm³ (bulk) |
| pH (15% solution) | 4.0–4.4 | approx. 4.2 |
| Loss on drying (105°C) | ≤ 0.5% | ≤ 5.0% |
| Particle size (max) | Not applicable | ≤ 40 µm (≥ 99.5%); ~85% < 5 µm |
| Iron (Fe) | ≤ 50 ppm | ≤ 50 ppm |
| Heavy metals (as Pb) | ≤ 20 ppm | ≤ 20 ppm |
| Arsenic (As) | ≤ 3 ppm | ≤ 3 ppm |
| Product Type | Locron® L Concentration | Locron® P Concentration |
|---|---|---|
| Roll-on | 15–30% active (3–6% Al) | 10–20% active (2.5–5% Al) |
| Pump spray | 10–20% active (2–4% Al) | 5–15% active (1.2–3.7% Al) |
| Aerosol spray | Generally not used | 5–15% active (1.2–3.7% Al) |
| Cream/Lotion | 20–25% active (4–5% Al) | 15–20% active (3.7–5% Al) |
| Gel | 15–25% active (3–5% Al) | 10–20% active (2.5–5% Al) |
| Stick | 20–30% active (4–6% Al) | 15–25% active (3.7–6% Al) |
| Powder (dry) | Not applicable | 10–30% active (2.5–7.5% Al) |
| Parameter | Recommendation |
|---|---|
| Locron L usage | Ideal for aqueous and hydroalcoholic systems; ready-to-use solution – add directly |
| Locron P usage | Ideal for anhydrous systems (sticks, powders, aerosols) and aqueous systems; must be dissolved in water first |
| Solubility (Locron P) | Slow in cold water; faster in warm water (max 40°C) – up to ~60% w/w |
| pH adjustment | Maintain pH 3.5–4.5 for stability; avoid pH >5 (precipitation) |
| Compatibility | Compatible with most surfactants, thickeners, preservatives |
| Incompatibilities | Avoid high pH (>5), strong bases, strong oxidizing agents |
Locron P is specifically designed for spray and aerosol antiperspirants:
| Parameter | Value | Significance |
|---|---|---|
| Particle size (max) | ≥ 99.5% < 40 µm | Small enough to pass through aerosol valves |
| Fine fraction | ~85% < 5 µm | Respirable particles – remain on skin, do not reach lungs |
| Morphology | Irregular, plate-like | Good distribution on skin surface |
| Powder flow | Good | Suitable for manufacturing and filling |
| Parameter | Locron® L | Locron® P |
|---|---|---|
| Function | Coagulant for removal of suspended solids, organic matter, phosphorus | |
| Typical dosage | 10–100 mg/L | 5–50 mg/L (more concentrated) |
| Optimum pH range | 6.0–8.0 | 6.0–8.0 |
| Turbidity removal | 85–99% | 85–99% |
| Phosphorus removal | 80–95% | 80–95% |
| COD reduction | 40–70% | 40–70% |
| Property | Locron (ACH) | PAC | Alum (Al₂(SO₄)₃) | FeCl₃ |
|---|---|---|---|---|
| Basicity | 80–85% | 40–90% | 0% | 0% |
| Al content (as Al₂O₃) | 23–24% (L); 45–47% (P) | 10–30% | 8–9% | N/A |
| pH drop upon addition | Very low | Low | High | Moderate |
| Sludge volume | Very low | Low | High | Medium |
| Application | Description |
|---|---|
| Paper making | Sizing agent, retention aid |
| Textile | Mordant, water repellent treatment |
| Ceramics | Binder for refractory materials |
| Swimming pools | Algae control, water clarification (1–5 mg/L) |
| Catalysts | Precursor for aluminum-containing catalysts |
| Parameter | Value |
|---|---|
| Oral LD₅₀ (rat) | >5,000 mg/kg (low toxicity) |
| Skin irritation | Mild to moderate irritant |
| Eye irritation | Moderate to severe irritant (acidic) |
| Skin sensitization | Generally non-sensitizer |
| Inhalation (dust – Locron P) | Dust may cause respiratory tract irritation |
| Inhalation (mist – Locron L) | Mist may cause respiratory tract irritation |
Aluminum exposure has NOT been proven to cause Alzheimer's disease
NO conclusive evidence linking antiperspirant use to breast cancer
FDA classification: GRASE (Generally Recognized as Safe and Effective) for OTC antiperspirants (2019 proposed rule)
EU Cosmetic Regulation: Permitted (Annex III, entry 11)
Maximum authorized concentration: 20% as aluminum chlorohydrate (in aqueous solution, corresponding to 5.45% Al)
| Region | Regulation |
|---|---|
| USA | FDA monograph for OTC antiperspirants (proposed rule 2019 – GRASE) |
| EU | Permitted under Cosmetic Regulation (EC) No 1223/2009 – Annex III, entry 11 |
| Canada | Permitted as antiperspirant active ingredient |
Hazards: Causes eye and skin irritation. Dust (Locron P) or mist (Locron L) may cause respiratory irritation.
PPE (recommended): Chemical-resistant gloves (nitrile or neoprene), safety goggles (EN 166) or face shield, dust mask (FFP2/N95 for Locron P), protective clothing
Engineering controls: Local exhaust ventilation (LEV), eyewash stations and safety showers
| Parameter | Locron® L (Liquid) | Locron® P (Powder) |
|---|---|---|
| Storage temperature | 5–40°C | 5–30°C |
| Freeze sensitivity | High (freezing → precipitation) | None |
| Hygroscopicity | Low (moderate) | High (absorbs moisture, cakes) |
| Shelf life (sealed container) | 12–24 months | 24–36 months |
| Shelf life (opened container) | 6 months | 12 months (if kept dry) |
| Regulation | Locron® L (Liquid) | Locron® P (Powder) |
|---|---|---|
| UN Number | 1760 | Not regulated |
| ADR/RID | Class 8 (Corrosive), PG III | Not dangerous goods |
| IMDG | Class 8, PG III | Not regulated |
| IATA | Class 8, PG III | Not regulated |
English: Aluminum chlorohydrate, Aluminum hydroxychloride, ACH, Aluminum chloride hydroxide, Basic aluminum chloride, Dialuminium chloride pentahydroxide, Chlorhydrol
Turkish: Alüminyum klorohidrat, Alüminyum hidroksiklorür, ACH
| Standard | Compliance |
|---|---|
| Cosmetic Regulation (EU) 1223/2009 | Permitted (Annex III, entry 11) |
| FDA OTC Antiperspirant Monograph | GRASE (proposed rule 2019) |
| REACH (EC 1907/2006) | Registered |
| NSF/ANSI 60 | Certified for certain grades (drinking water treatment) |
| Advantage | Description |
|---|---|
| High efficacy antiperspirant | Proven sweat reduction (40–60% OTC) |
| Polymeric aluminum species | Enhanced precipitation and plug formation compared to simple aluminum salts |
| High basicity (80–85%) | Less acidic – milder on skin |
| Both forms available | L (liquid): ready-to-use solution – easy handling; P (powder): more concentrated – lower transportation cost, suitable for anhydrous formulations |
| Micronized Locron P | Optimized particle size for aerosol and spray applications |
| Low pH drop (water treatment) | Does not depress pH as much as alum |
| Low sludge generation | 30–50% less sludge than alum |
| Globally approved | Permitted in EU, USA (GRASE), Canada, and many other markets |
| Limitation | Locron® L (Liquid) | Locron® P (Powder) |
|---|---|---|
| Corrosivity | Yes (Class 8) | Low (corrosive in solution) |
| Freeze sensitivity | Yes – precipitation | None |
| Hygroscopicity | Low | High – cakes |
| Dust control | Not required | Required |
| Dissolution time | Not applicable (already in solution) | 15–30 minutes (with mixing) |
| Feature | Locron® L (Liquid) | Locron® P (Powder) |
|---|---|---|
| Ease of use | ++ (add directly) | + (must dissolve first) |
| Formulation flexibility | + (aqueous systems) | ++ (aqueous and anhydrous systems) |
| Concentration | Low (23–24% Al₂O₃) | High (45–47% Al₂O₃) |
| Transportation cost | Higher (water weight) | Lower (concentrated) |
| Shelf life | 12–24 months | 24–36 months |
| Aerosol suitability | Low | High |
| Sector | Application | Typical Concentration (L) | Typical Concentration (P) |
|---|---|---|---|
| Cosmetics (Antiperspirant) | Roll-on, spray, cream, stick | 10–30% active | 5–25% active |
| Water Treatment | Coagulant | 10–100 mg/L | 5–50 mg/L |
| Swimming Pools | Algae control | 1–5 mg/L | 0.5–2.5 mg/L |
| Paper Industry | Sizing agent, retention aid | 0.5–2% | 0.3–1.5% |
| Textile | Mordant, water repellent | 1–5% | 0.5–3% |
| Ceramics | Binder for refractories | 1–10% | 0.5–5% |
This TDS is prepared in compliance with ISO 11014-1 format and is intended for cosmetic formulators, water treatment engineers, product development chemists, and procurement professionals. Certificates of Analysis (CoA), Safety Data Sheets (SDS), and sample validation reports are available upon request.