Zinc Oxide Powder
Source: Chemical synthesis
Content specification: Industrial grade: 95% -97%;
Medicinal grade: 99% -100%;
Feed grade: 80% -95%
Testing method: EDTA
CAS NO ：1314-13-2
Number of Contents: 80-200
Appearance: White or pale yellow powder
Product uses: Rubber industry, paint and coating industry, ceramic industry, pharmaceutical industry, feed industry, cosmetics industry
Product packaging: 1KG/aluminum foil bag; 25KG/cardboard drum
Product storage: Store in a dry and cool place, away from sunlight and high temperatures
Shelf life: 24 months
Bulk Zinc Oxide Powder | USP Pharma Grade & Nano UV Filter Wholesale
Premium Mineral UV & Active Barrier Matrix by Xi'an Tihealth
Formulating high-SPF physical sunscreens, pediatric rash ointments, and advanced elastomers requires a Zinc Oxide (ZnO) base strictly verified against heavy metal contamination and powder agglomeration. Xi'an Tihealth supplies an industrial-scale, ultra-pure Zinc Oxide Powder engineered specifically for rigorous pharmaceutical, cosmetic, and advanced chemical manufacturing.
Processed via an advanced closed-loop indirect vaporization method (French Process), our ZnO achieves a pharmacopeia-grade purity of ≥99.9%. For cosmetic R&D formulators, our specialized nano-grade specification utilizes a proprietary triple-coating technology (SiO2 / Stearic Acid / Dimethicone) to guarantee exceptional dispersion stability and eliminate the undesirable "white-cast" on the skin. Functioning as a broad-spectrum UVA/UVB shield, a mild antimicrobial astringent, and a potent vulcanization activator, our ZnO is the foundational mineral for brands demanding uncompromised compliance.
1. Formulation Edge: Why Upgrade to Our Advanced ZnO?
For R&D chemists, integrating raw zinc oxide often leads to emulsion instability, photo-reactivity, and gritty textures. Our precision-engineered powder eliminates these critical industrial bottlenecks:
- Triple-Coated Nano Dispersion (Zero White-Cast): Uncoated nano-ZnO agglomerates instantly in lipid/water phases, creating an unblendable paste. Our cosmetic-grade powder is surface-treated to shift the zeta potential, ensuring homogeneous integration into the oil phase of sunscreens. This provides a transparent finish and >24 months of dispersion stability.
- Rigorous Heavy Metal Control (Pediatric Safe): Commercial zinc oxide frequently fails compliance due to Lead (Pb), Cadmium (Cd), and Chromium (Cr) spikes. Our pharma-grade purification strictly limits these contaminants well below USP and EU cosmetic directives, making it the absolute safest choice for infant diaper creams and lip care.
- Suppressed Photo-Catalytic Activity: Raw ZnO generates free radicals upon UV exposure, degrading organic formulation components. Our specialized surface inerting neutralizes this photo-catalytic degradation, ensuring your SPF formula remains stable under intense solar radiation.
2. Certificate of Analysis (Pharmaceutical USP Grade TDS)
| Test Parameter | Specification Limit | Test Method / Standard |
|---|---|---|
| Physicochemical Properties | ||
| Assay / Purity (ZnO) | ≥ 99.0% (Typical 99.8%) | EDTA Titration (USP) |
| Particle Size (D50) | 0.1 - 1.0 μm (Nano/Micro grades) | Laser Diffraction (ISO 13320) |
| Loss on Ignition | ≤ 1.0% (at 800°C) | EP 2.4.14 |
| Specific Surface Area (BET) | 4 - 8 m²/g (Adjustable) | Nitrogen Adsorption |
| Safety & Critical Contaminants | ||
| Lead (Pb) | ≤ 5.0 ppm (Typical < 1 ppm) | ICP-MS (USP <232>) |
| Cadmium (Cd) | ≤ 1.0 ppm | ICP-MS |
| Chromium (Cr) | ≤ 1.0 ppm | ICP-MS |
| Total Aerobic Microbial Count | ≤ 100 CFU/g | USP <61> |
3. Primary Functional Mechanisms & B2B Applications
| Industry Sector | Specific Applications & Mechanism of Action |
|---|---|
| Cosmetics & Personal Care | The premier physical UV filter for "Reef-Safe" Sunscreens. It acts as a physical mirror, offering high refractive index scattering of both UVA (aging) and UVB (burning) rays without penetrating the dermis. |
| Pharmaceuticals (OTC) | Active ingredient in Diaper Rash Creams and Eczema Ointments. Its mild astringency absorbs exudate and sebum, forming a protective moisture barrier while the slow release of Zn²+ ions disrupts topical bacterial membranes. |
| Industrial Rubber & Elastomers | Acts as the core Vulcanization Activator. Dramatically shortens curing times and enhances the cross-linking density, heat resistance, and tensile strength of heavy-duty tires. |
4. Advanced Manufacturing (French Process)
To guarantee strict pharmacopeia-grade compliance, Xi'an Tihealth utilizes the highly controlled Indirect Method (French Process):
- Vaporization: 99.99% pure zinc ingots are melted via induction and heated to boiling (907°C) to create a pure zinc gas.
- Controlled Oxidation: The vapor reacts instantaneously with pre-heated atmospheric oxygen in an oxidation chamber to form ultra-fine ZnO.
- Fractionation: Specialized baghouse filters separate particles by D50 distributions, tailoring the density for either cosmetic or industrial demands.
- Lipophilic Coating: Nano-grade batches undergo high-shear wet coating (e.g., Stearic Acid) to guarantee absolute hydrophobicity and dispersion performance.
5. Formulation & Technical FAQ
Should I formulate with Zinc Oxide or Titanium Dioxide (TiO2)?
For modern, premium formulations, Zinc Oxide is overwhelmingly preferred. While TiO2 is highly effective against UVB rays, it falls short against deep-penetrating UVA rays. Zinc Oxide is uniquely FDA-approved as a single active ingredient to provide complete, broad-spectrum UVA and UVB protection with significantly lower photo-reactivity.
Why is your Pharma-Grade ZnO critical for infant care products?
Standard industrial Zinc Oxide often contains heavy metal spikes. Because diaper creams are applied to compromised infant skin barriers, systemic absorption of trace metals is a severe regulatory risk. Our Pharmaceutical-Grade ZnO guarantees Lead (Pb), Cadmium (Cd), and Chromium (Cr) levels are strictly suppressed to ≤1 ppm, ensuring flawless safety compliance.
Do you offer EXW pricing and international freight support?
Yes. We regularly supply bulk commercial volumes to contract manufacturers globally. We offer highly competitive EXW pricing alongside FCA, FOB, and DDP terms, supported by comprehensive quality documentation (COA, MSDS, and GMP certifications) to streamline your import process.
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