Zinc phosphate – a professional raw material for industry and laboratories

Zinc phosphate (Zn₃(PO₄)₂) – high purity, competitive price, delivery within 24 hours. We are an experienced distributor of chemical raw materials, offering zinc phosphate in various purities: technical, pure, pro analysi (p.a.) and in special grades for paints, anti-corrosion coatings, and plastics.

Our product is dedicated to manufacturers of paints and varnishes, protective coatings industry, manufacturers of plastics, construction chemicals, electroplating and research laboratories. We include with each delivery certificate of analysis (CoA), safety data sheet (SDS) and complete technical documentation. We guarantee consistent quality between batches, competitive wholesale prices, and technical support.

Basic specification – zinc phosphate Zn₃(PO₄)₂

Zinc phosphate – price and pricing factors

The price of the product depends on several key factors:

• Chemical purity: p.a. products are more expensive than technical ones
• Industry Specification: Types for anti-corrosive paints (with particle size and specific surface area control) are more expensive than standard types.
• Order size:The price per kg decreases with larger quantities (volume discounts).
• Particle size and surface treatment:Surface-modified products have a higher price.
• Packaging:standard bags vs. big bags vs. specialized packaging
• Documentation:Additional certifications (compliance with automotive and paint industry standards) may affect the price.

Retail orders (1–5 kg):from several dozen to several hundred zlotys

Wholesale orders (25+ kg):individual pricing with a discount

Annual contracts (1000+ kg): the most favorable pricing terms

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Ask about current prices, availability, and wholesale discounts. We will respond within 24 hours.

Zinc phosphate - Where to buy? Ask for an offer!

Order a sample or request a wholesale quote

We offer free samples of zinc phosphate (250–500 g) for application testing before placing a larger order. For B2B customers, we prepare individual quotes that take into account:

• - Size and frequency of orders
• - Documentation and certification requirements (industrial paints, automotive, construction)
• - Special technical requirements (particle size, specific surface area, surface treatment)
• - Packaging and labeling requirements

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Zinc phosphate – a key component of modern coatings and materials

Definition and chemical formula of FePO₄

Zinc phosphate is an inorganic chemical compound with the formula Zn₃(PO₄)₂, which is a zinc salt of phosphoric acid. In industry, it occurs mainly in the form of a white crystalline powder with outstanding anti-corrosion properties. This compound plays a key role in modern metal surface protection technologies, being one of the most important anti-corrosion pigments in industrial paint and varnish systems.

The use of this raw material in industry is based on three main pillars. Firstly, as anti-corrosive pigment effectively protects metal surfaces against corrosion, replacing toxic chromate and lead pigments. Secondly, in processes phosphating creates durable conversion coatings on steel and aluminum, providing an excellent base for paints and varnishes. Thirdly, as functional filler in plastics, construction mortars, and adhesives, it improves mechanical properties and resistance to weather conditions.

Working with us as your supplier guarantees access to raw materials with consistent quality parameters, complete technical documentation in line with industry requirements, and technical support at every stage of product implementation into your technological processes. We offer grades tailored to specific applications in paints, coatings, plastics, and construction chemicals.

Chemical characteristics and properties

Chemical name, synonyms, and formula

This compound has many names depending on the industrial and scientific context. Its chemical name according to IUPAC nomenclature is Zinkphosphat (engl.), im Polnischen bezeichnet als zinc(II) phosphate or zinc phosphate. Technical literature also uses the following names: zinc orthophosphate (zinc orthophosphate) and tribasic zinc phosphate (basic zinc phosphate).

The basic chemical formula isZn₃(PO₄)₂, However, in industrial practice, the hydrated form is most common. Zn₃(PO₄)₂·4H₂O (tetrahydrate). In nature, this compound occurs as a mineral. phosphophyllite or hopeite, although industrial molds are manufactured synthetically to ensure consistent quality parameters.

In chemical catalogs and material safety data sheets, it is identified by the number CAS 7779-90-0 (tetrahydrate) or CAS 7543-51-3 (anhydrous form). The EINECS number is 231-944-3 These unique identifiers are crucial when ordering a product and verifying compliance with legal requirements.

Physicochemical parameters

The pure form of the preparation is a white crystalline powder with a characteristic, slightly grainy appearance. Technical products may have a slightly grayish tint due to admixtures or specific production conditions. The particle size in standard grades ranges from 1–15 micrometers, although for paint applications, narrower fractions (2–5 μm) are often required to achieve optimal application properties.

Solubility in water is practically zero (0.0014 g/100 ml at 20°C), which makes this pigment ideal for water-based and solvent-based systems – it does not wash out of the coating during use. However, the compound dissolves in mineral acids (HCl, H₂SO₄, HNO₃) and in strong alkali solutions.

Density ranges from 3.04 to 3.998 g/cm³ depending on the crystal form and degree of hydration. This high density translates into good covering properties in paint systems. Thermal stability is very good – the compound remains stable up to a temperature of approximately 900°C, with loss of crystallization water occurring in the range of 100–200°C (transition of tetrahydrate to anhydrous form).

The key parameter for paint applications is specific surface area (BET)which is 3–15 m²/g for standard grades and can reach 20–40 m²/g for special grades. A larger specific surface area translates into better anti-corrosion properties, but can also increase the viscosity of paint systems.

Available purities and product forms

Types of anti-corrosion paints and coatings

For the paint and coatings industry, we offer zinc phosphate in special grades optimized for pigment and anti-corrosion properties. These products feature strictly controlled particle size (typically 2–5 μm), ensuring optimal coverage, good dispersion in paint systems, and rheological stability.

Key parameters for paint formulators

• Zinc content: min. 48–50% Zn (calculated as metal)
• Specific surface area BET: 10–25 m²/g (depending on application)
• Particle size d50: 2–5 μm
• Oil absorption (according to DIN 53199): 15–25 g/100 g
• pH of water suspension (10%): 6.5–8.5
• Water-soluble substance content: max. 0.3%

The pigment in anti-corrosive paints works in several ways. First, it passivates the metal surface by forming insoluble complexes with iron ions. Secondly, it increases the pH in micro-areas under the coating, inhibiting corrosion processes. Thirdly, it improves the adhesion of the coating to the metal substrate by forming chemical bonds at the metal-organic phase boundary.

It is used in anti-corrosion primers (typically 10–25% in dry formula), primer paints for steel structures, epoxy and polyurethane systems for the automotive, offshore, and infrastructure industries. It is a safe alternative to chromate (VI) pigments, which are classified as carcinogenic and subject to REACH restrictions.

Grades for plastics, composites, and construction chemicals

In plastics The preparation acts as a functional filler and flame retardant. When added to polyamides, polypropylene, PVC, and epoxy resins, it improves the modulus of elasticity, reduces shrinkage after curing, and increases resistance to UV and thermal aging. Typical dosages are 5–20% by weight.

In construction chemicals It is used as a component of repair mortars for concrete, construction adhesives, and sealants. It acts as a corrosion inhibitor for steel reinforcement in concrete, especially in chloride-containing environments (bridges, coastal structures, tunnels). Additionally, it improves adhesion to mineral and metal substrates.

In polymer-concrete composites increases resistance to chemicals (acids, bases, salts) and improves tribological properties (abrasion resistance). It is also used in floor coatings for the chemical and food industries, where high chemical and mechanical resistance is required.

Parameters for grades for plastics and construction chemicals

• Purity: min. 95% Zn₃(PO₄)₂
• Particle size d50: 3–10 μm
• Moisture content: max. 1.0%
• Soluble substance content: max. 0.5%
• Color: white to slightly grayish

Standard and special packaging

Standard packaging:

• 1 kg, 5 kg – HDPE plastic containers (for laboratories, technological testing)
• 25 kg – paper bags with polyethylene lining (industrial standard)
• Big-share 500–1000 kg– for large industrial customers, with palletizing capability

Special packaging on request:

• Bags with additional aluminum lining (for hygroscopic products)
• Unit packaging 10 kg, 15 kg (adapted to the customer's production lines)
• Labeling in a foreign language and with the customer's logo (white label)
• Packaging in transport packaging according to ADR/IMDG requirements

Packaging and logistics:

• Standard pallet: 1000 kg (40 bags × 25 kg) or 1 big bag
• Security: stretch film, banderole, transport labels
• Expiration date: 24 months from the date of manufacture (in original packaging)
• Storage conditions: dry place, temperature 5–30°C, protect from moisture

Industrial applications

Anti-corrosion pigment in paints and varnishes

This anti-corrosive pigment forms the basis of modern anti-corrosion protection systems. Its mechanism of action is based on passivation of metal surfaces by creating thin layers of insoluble iron and zinc phosphates, which effectively inhibit oxidation processes. Unlike chromate pigments (zinc chromate, strontium chromate), it does not contain chromium(VI) and is safe for the environment and employee health.

In water-based and solvent-based paint systems plays a dual role. Firstly, as a pigment, it provides passive protection by physically separating the metal substrate from corrosive agents (water, oxygen, salts). Secondly, it ensures active protection – When exposed to moisture, zinc and phosphate ions are released, which passivate areas of damage to the coating (scratches, chips), preventing the development of undercorrosion.

Typical applications in paints:

• Anti-corrosion primers for structural steel (bridges, machinery, steel structures)
• Primers in the automotive industry (frame, chassis, body parts)
• Paint systems for the offshore and marine industries (drilling platforms, ships, port structures)
• Paints for roofing and metal structures in construction
• Protective coatings for machine and equipment components exposed to moisture and chemicals

Dosage in paints: Typically 8–25% in dry paint mass (depending on anti-corrosion requirements). It can be used alone or in combination with other pigments (iron phosphate, aluminum phosphate, zinc oxide).

Phosphating and conversion coatings

Metal surface processing using the method zinc phosphating This is one of the most important technologies for preparing substrates prior to painting in the automotive, household appliances, and machine industries. It involves creating thin layers (1–10 μm) of crystals on the surface of steel or aluminum through a chemical reaction with a phosphating bath.

Phosphorylation mechanism:

• Degreasing metal surfaces (removing oils and greases)
• Surface activation (increasing the number of crystallization centers)
• Phosphating bath – reaction of zinc and phosphoric acid with the metal surface
• Rinsing and passivation (sealing of the layer)

It was created phosphate layer It is characterized by a developed microcrystalline surface, which drastically improves the adhesion of organic coatings (paints, varnishes, adhesives). In addition, this layer itself acts as an anti-corrosion barrier, especially when combined with maintenance oils.

Applications of phosphate coatings:

• Car bodies (entire bodywork before painting)
• Automotive components (suspension, engine components, exhaust systems)
• Household appliances (washing machines, refrigerators, ovens – before powder coating)
• Fasteners (bolts, nuts, washers – corrosion protection)
• Steel structure components exposed to harsh operating conditions

In phosphating processes, the preparation is used both as a component of the phosphating bath and as a reaction product forming a protective layer.

Use in plastics, adhesives, and construction chemicals

In plastics industry The product is valued as a functional filler that improves the mechanical and thermal properties of polymers. In polyamides (PA6, PA66), an addition of 5–15% increases the elastic modulus by 20–40%, reduces the thermal expansion coefficient, and improves creep resistance at elevated temperatures. In PVC, it is used as a synergist for calcium-zinc stabilizers, improving thermal stability during processing.

In structural adhesives (epoxy, polyurethane, acrylic), it acts as a filler that increases shear and peel strength. Additionally, it improves the adhesive's resistance to chemicals and high temperatures. Used in adhesives for bonding metals, composites, and in adhesives for the automotive and aerospace industries.

In construction chemistry, it is used as:

• Corrosion inhibitor for reinforcement in concrete (repair mortars, repair concretes)
• Component of epoxy mortars for fixing anchors in concrete
• Filler in sealants for expansion joints
• Bonding agent for concrete and steel substrates
• Modifier in industrial floor mortars (increased chemical resistance)

Dosage:3–10% in cement mortars, 5–20% in resin systems

Other specialized applications

The compound is also used in a number of industrial niches. In electronics industry is used as a filler in conductive composites and EMI/RFI interference materials. In technical ceramics is a component of glazes and enamels with increased chemical resistance. In fire protection systems acts as a synergist for flame retardants in plastics and intumescent coatings.

In the pharmaceutical and cosmetics industries, it can be used (in the appropriate pharmacopoeial purity) as a source of zinc in dietary supplements and as an ingredient in toothpastes with antibacterial properties. In agriculture, it is used as a fertilizer providing phosphorus and zinc – microelements necessary for proper plant growth.

Documentation and quality control

Safety Data Sheet (SDS) and technical specifications

Each batch delivered by our company includes complete technical documentation in accordance with REACH and CLP requirements. The Safety Data Sheet (SDS) prepared in accordance with Regulation (EC) No. 1907/2006 contains 16 sections covering: substance identification, hazard information, composition and information on ingredients, first aid, firefighting measures, measures in case of accidental release, product handling and storage, exposure controls and personal protection, physical and chemical properties, stability and reactivity, toxicological and ecological information, waste disposal, transport information, and regulatory information.

Technical specifications contain detailed product parameters relevant to the customer's technological process:

• Zinc content (% metallic Zn)
• Zn₃(PO₄)₂ content (% in product)
• Particle size (d10, d50, d90)
• Specific surface area BET (m²/g)
• Oil absorption (g/100 g)
• pH of water suspension (10%)
• Humidity (%)
• Water-soluble substance content (%)
• Color (on the CIE Lab* scale)
• Bulk density (g/l)

The documentation is available in Polish, English, and other EU languages upon request.

Certificate of analysis and batch repeatability

Each delivery is accompanied by a Certificate of Analysis (CoA), confirming that the product batch complies with the technical specifications. The certificate includes:

• Production batch number
• Date of manufacture and expiry date
• Test results for all parameters from the specification
• Signature of authorized person and manufacturer's stamp

Our quality management system guarantees repeatability of parameters between batches at a level of ±2% for key indicators (Zn content, d50 particle size, BET surface area). This gives customers the assurance of stable application properties and eliminates the need to re-optimize formulations with each delivery.

Documentation storage: all analysis certificates are archived for a period of 10 years and are available upon customer request. The batch numbering system enables full product traceability from raw material to finished product.

Compliance with industry standards and requirements

The product supplied by our company meets the requirements of key industry standards:

Paint industry:

• ISO 3549:1995 – Pigments and fillers. Methods of testing general properties
• ISO 787 (parts 1-25) – Test methods for pigments
• ASTM D476 – Standardklassifizierungssystem für Trockenpigmente für Farben

Automobilindustrie:

• DBL 7389 (Daimler) – Anforderungen an Korrosionsschutzpigmente
• TL 226 (VW/Audi) – Anforderungen an die Oberflächenvorbereitung und Beschichtungen
• GSB (Saint-Gobain) – Qualitätsstandards für Pigmente

Einhaltung der REACH-Vorschriften:

• REACH-registrierte Substanz
• Keine SVHC-Stoffe (Substance of Very High Concern)
• Compliance with CLP requirements for classification and labeling

At the customer's request, we can provide certificates of conformity with specific industry standards and declarations of conformity with end customer requirements.