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Iron Oxide Black

  • Iron Oxide Black
  • Iron Oxide Black
  • Iron Oxide Black
Short Description:

It is a commonly used magnetic material, and special pure ferric oxide is used as a raw material for recording tapes and telecommunication equipment, natural magnetite is a raw material for iron making, and is used to make primer and topcoat.

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Product Parameters
Iron Oxide Black

Type

Fe2O3

Oil Absorption

Res. on
325 mesh

Water
Sol .salts

Moisture

PH value

Density 

Particle Shape

Compared with std

Tinting Strength
（%） (g/100g） （%） （%） （%） （g/cm） （%）
740 ≥93 15-25 ≤0.4 ≤0.5 ≤1.0 5-8 0.8-1.2 Spherical ≤1 95-105
750 ≥95 15-25 ≤0.4 ≤0.5 ≤1.0 5-8 0.8-1.2 Spherical ≤1 95-105
723 ≥92 15-25 ≤0.4 ≤0.5 ≤1.0 5-8 0.8-1.2 Spherical ≤1 95-105
790 ≥92 15-25 ≤0.4 ≤0.5 ≤1.0 5-8 0.8-1.2 Spherical ≤1 95-105
9675 20-45 ≤1.0 ≤1.0 ≤1.5 5-8 0.2-0.4 Acicular ≤1 110-130
Hs50 20-45 ≤1.0 ≤1.0 ≤1.5 5-8 0.2-0.4 Acicular ≤1 110-130
FE3O4 INDUSTRIAL SERIES

Black Oxide Powder

Iron Oxide Black Fe3O4 CAS 1317-61-9 E172 Food Grade
CHEMICAL PROFILE

What Is Black Oxide Powder?

Iron Oxide Black Powder is an inorganic black pigment with the chemical formula Fe₃O₄ (CAS 1317-61-9), commonly referred to as Black Iron Oxide Fe3O4. It is produced through controlled precipitation or calcination processes, resulting in a fine, free-flowing powder with uniform particle size distribution and a stable spinel crystal structure.

Black Oxide Powder delivers strong tinting strength, consistent opacity, and reliable lightfastness — properties that make it suitable for demanding outdoor and industrial environments. Unlike organic black pigments, it contains no polycyclic aromatic hydrocarbons (PAHs), which positions it for compliance with international safety standards including the EU E172 food-grade classification.

The product line covers multiple grades — including Iron Oxide Black 318, Iron Oxide Black 330, and Iron Oxide Black 722 — each formulated to specific particle size ranges, surface area profiles, and end-use performance targets. Whether the application requires deep black color in concrete, corrosion-resistant industrial coatings, food-contact compliance, or ferrimagnetic functionality, a corresponding Black Iron Oxide Pigment grade is available.

Key Product Advantages

01
Chemical Stability
The Fe₃O₄ spinel structure resists acid/alkali attack, solvent migration, and heat deformation up to 300°C, maintaining color integrity throughout processing and service life.
02
Tinting Strength and Opacity
Iron Oxide Black Powder achieves deep, uniform black tones at low loading levels. Tinting strength indices range from 80% to 110% depending on grade.
03
Weatherfastness
Outdoor performance is sustained without hue shift, chalking, or fading under prolonged UV exposure — a requirement met by all grades of Iron Oxide Pigment Black.
04
Regulatory Compliance
Food- and pharma-grade batches meet EU Black Iron Oxide E172 specifications, with heavy metal content (As, Pb, Hg, Cd) controlled to levels approved by EFSA and FDA.
05
Multi-Grade Availability
Grades 318, 330, and 722 cover the full particle size spectrum from sub-0.3 µm to 1.0 µm, accommodating both fine-dispersion and high-loading applications.
06
Surface Treatment Options
Hydrophilic or hydrophobic surface treatment is available, enabling compatibility with both water-borne and solvent-borne systems.

Technical Specifications

The following table presents typical physicochemical parameters for Black Oxide Pigment Powder. Exact values vary by grade; certificates of analysis are available upon request.

Parameter
Iron Oxide Black 318
Iron Oxide Black 330
Iron Oxide Black 722
Fe₃O₄ Purity (%)
≥ 96
≥ 95
≥ 94
Particle Size D50 (µm)
0.1 – 0.3
0.3 – 0.6
0.6 – 1.0
BET Surface Area (m²/g)
15 – 20
8 – 15
6 – 10
Tinting Strength (%)
100 – 110
90 – 100
80 – 90
Oil Absorption (g/100g)
25 – 30
18 – 25
15 – 20
pH (10% slurry)
6.5 – 7.5
6.0 – 8.0
6.0 – 8.0
Heat Resistance (°C)
≤ 300
≤ 300
≤ 280
Moisture Content (%)
≤ 1.0
≤ 1.5
≤ 1.5
Typical values for Black Oxide Powder grades 318, 330, and 722. All data subject to batch variation; refer to Certificate of Analysis for confirmed values.

Application Areas

Construction
Black Oxide Pigment Powder is extensively used to color cement concrete, colored asphalt, paving tiles, artificial stone, and precast elements. Typical dosage ranges from 0.5% to 5% by dry weight. Its strong alkali resistance ensures color stability within the high-pH environment of cementitious systems, where many organic pigments would degrade.
Coatings
Iron Oxide Pigment Black is incorporated into anticorrosion primers, marine coatings, industrial topcoats, and architectural paints. Compared to carbon black, it disperses more uniformly, exhibits lower tendency to flocculate, and contributes mild rust-inhibiting properties through its iron oxide chemistry. Both Iron Oxide Black 318 (fine grades for color depth) and Iron Oxide Black 330 (balanced dispersion) are used depending on formulation requirements.
Plastics and Rubber
Black Iron Oxide Pigment performs reliably in polyolefins, PVC, ABS, and rubber compounds. Iron Oxide Black 722, with its larger particle size and lower oil absorption, is particularly suited to high-loading plastic and asphalt applications where cost efficiency is a factor. Thermal stability up to 280–300°C accommodates most standard injection molding and extrusion processes.
Food and Pharma E172
Black Iron Oxide E172 is approved by the European Food Safety Authority (EFSA) and is listed in EU Regulation (EC) No 1333/2008 as a permitted food coloring for specific applications such as olive surface coloring. In pharmaceuticals, it is used in tablet coatings and capsule printing inks. In cosmetics, Black Oxide Pigment appears in eye shadow, eyeliner, mascara, and nail color formulations, subject to EU Cosmetics Regulation (EC) No 1223/2009 and FDA 21 CFR compliance. Heavy metal limits — As ≤ 3 ppm, Pb ≤ 10 ppm, Hg ≤ 1 ppm — must be confirmed per applicable market regulations.
Magnetic Materials
The ferrimagnetic nature of Black Iron Oxide Fe3O4 enables its use in magnetic recording media, ferrite core premix, electromagnetic shielding coatings, and ferrofluid formulations. Specific surface area and particle size distribution are critical parameters for these applications; Iron Oxide Black 318 with its fine particle size and high BET surface area is typically selected for functional magnetic uses.

Grade Selection Guide

Selecting the appropriate Black Oxide Pigment grade depends primarily on particle size requirements, dispersion system type, loading level, and end-use performance criteria. The following guide outlines the typical selection logic:

A
Iron Oxide Black 318
Sub-0.3 µm particle size, highest tinting strength index (100–110%). Suited to applications requiring deep black intensity at low pigment loading — including high-performance coatings, color pastes, cosmetics, and magnetic functional materials.
B
Iron Oxide Black 330
Mid-range D50 (0.3–0.6 µm), balanced tinting strength and dispersion. The most widely specified grade for construction coloring, general-purpose paints, and industrial pigment dispersions.
C
Iron Oxide Black 722
Coarser particle size (0.6–1.0 µm), lower oil absorption, reduced cost per unit volume. Suited to asphalt, high-fill plastic compounds, and applications where tinting strength requirements are secondary to flow and loading efficiency.

Frequently Asked Questions

Why does Black Oxide Powder settle in water-borne coatings?
Sedimentation in aqueous systems is typically related to insufficient surface hydrophilicity or inadequate dispersion. Specifying a hydrophilic surface-treated grade of Iron Oxide Black Powder, combined with a polycarboxylate dispersant and grinding to a fineness of ≤ 20 µm (Hegman 6+), substantially improves settling resistance and shelf stability.
What causes grey undertone in concrete colored with Iron Oxide Black?
Grey undertone usually results from three factors: low pigment loading, high water-to-cement ratio diluting color development, or efflorescence (alkali migration to the surface). Using Iron Oxide Black 318 — the finer and higher-tinting-strength grade — at a dosage of ≥ 2% by cement weight, while controlling curing conditions to minimize free alkali movement, produces a more consistent deep black finish.
How is E172 compliance verified for food and pharmaceutical applications?
Black Iron Oxide E172 compliance is verified through batch-specific third-party test reports (SGS, Intertek, Bureau Veritas) confirming identity (Fe₃O₄ ≥ 94%), heavy metal content (As, Pb, Hg, Cd, Cr), water-soluble matter, and particle size. Suppliers should provide a Technical Data Sheet (TDS), Safety Data Sheet (SDS), and a Declaration of Conformity referencing the relevant EU or USP/NF monograph. Confirm that the product batch is manufactured under food-grade GMP conditions and is not simply a repackaged industrial-grade material.
How does Iron Oxide Black compare to carbon black in coatings?
Iron Oxide Pigment Black and carbon black both produce black colorations but differ significantly in performance profile. Carbon black typically delivers a deeper jetness (lower L* value) at very low loading levels (0.1–0.5%), but requires more intensive dispersion energy and is prone to flocculation in certain resin systems. Black Oxide Pigment is easier to disperse, provides greater formulation stability, contributes some anticorrosive function, and is available in food/cosmetic-compliant grades — capabilities that carbon black does not offer. For applications where absolute jetness is the sole criterion and cost is critical, carbon black may be selected; for industrial protection, building materials, or regulated industries, Iron Oxide Black Powder is generally the specified choice.
What are the storage and handling requirements?
Black Iron Oxide Pigment should be stored in sealed containers in a dry, ventilated environment below 40°C, away from moisture sources. Prolonged exposure to humidity can cause caking, which increases dispersion difficulty without affecting chemical properties. The product is classified as a non-hazardous solid under international transport regulations (not subject to IMDG, IATA DGR, or ADR restrictions). Standard moisture-proof packaging (paper bags with PE liner, or jumbo bags with inner PE film) is recommended for bulk shipments.

Packaging and Available Formats

Iron Oxide Black Powder is available in the following packaging configurations to accommodate laboratory sampling through full production-scale procurement:

25 kg net paper bags (PE inner liner) — standard industrial packaging
500 kg / 1,000 kg jumbo bags (FIBC) — bulk shipment option
1 kg / 5 kg sample quantities — available for qualification testing
Custom packaging configurations available upon request for E172-grade batches requiring dedicated food-contact compliant materials
All shipments are accompanied by a Certificate of Analysis (CoA), Safety Data Sheet (SDS), and, where applicable, a Declaration of Conformity for Black Iron Oxide E172 or cosmetic-grade Black Oxide Pigment applications.
Deep Black Color · Industrial Durability · Global Compliance
Deqing Demi Pigment Technology Co. , Ltd.

Product packaging

We use high-quality packaging materials and professional packaging, palletizing, and film wrapping equipment.

  • 25KG papre bag with plastic inner
  • 25KG ater-soiubie bag
  • 25KG Low melting PE bag
  • 500KG-1250KG jumbo bag
    Full Shade:

  • 101

  • 120

  • 180

  • 313

  • 330

  • 610

  • 960

  • 835

    Reduction (1:10):

  • 101

  • 120

  • 180

  • 313

  • 330

  • 610

  • 960

  • 835

    Full Shade:

  • 110

  • 130

  • 190

  • 810

  • 318

  • 686

  • 2040

  • 5605

    Reduction (1:10):

  • 110

  • 130

  • 190

  • 810

  • 318

  • 686

  • 2040

  • 5605

Deqing Demi Pigment Technology Co. , Ltd.

Demei focuses on the research, development, and production of inorganic iron oxide pigments. We are China Wholesale Black Oxide Powder Manufacturers and Custom Black Iron Oxide Pigment Suppliers, Factory. Our pigments cover iron oxide red, yellow, black, brown, green, orange, blue, etc. Deqing Demi Pigment Technology Co. , Ltd. offer Black Iron Oxide E172, Iron Oxide Black 318, Iron Oxide Black 330, Iron Oxide Black 722 ect. We produce high-performance and high-stability composite iron oxide pigments with three series: standard, micronized, and low heavy metal content levels.

Demei not only contributes to production and operation, but also faithfully fulfills its social responsibilities, protects the ecological environment, strengthens safe production, and cares for the health of employees.

Deqing Hele New Material Technology Co Ltd. is our trade company.

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Iron Oxide Black Industry knowledge

Iron Oxide Black: High-Performance Fe₃O₄ Pigment for Industrial Applications

As a specialized Iron Oxide Black manufacturer and supplier, Deqing Demi Pigment Technology Co., Ltd. produces a full range of black iron oxide (Fe₃O₄, CAS 1317-61-9) pigments. Our portfolio includes standard, micronized, and low heavy metal series, covering grades such as 318, 330, 722, and industrial Fe₃O₄ types. These pigments deliver deep jetness, high tinting strength, and reliable weatherfastness for construction, coatings, plastics, food contact, and magnetic applications.

We engineer each grade for specific process demands—from fine-particle grades for high-intensity color to coarser grades for high-loading efficiency. With our own factory and quality control, we support projects from sample qualification to bulk supply.

Product Range and Grade Selection

Our black oxide line is organized by particle size and performance profile. The table below summarizes typical grades and their primary application fit.

Grade Fe₃O₄ Content Particle Size (D50) Tinting Strength Typical Applications
318 ≥96% 0.1–0.3 µm 100–110% High-performance coatings, color pastes, cosmetics, magnetic materials
330 ≥95% 0.3–0.6 µm 90–100% Concrete, general paints, industrial dispersions
722 ≥94% 0.6–1.0 µm 80–90% Asphalt, high-fill plastics, cost-efficient applications
Industrial Fe₃O₄ ≥93% Spherical, varied 95–105% Magnetic applications, primers, topcoats

For food and pharmaceutical use, we supply E172-compliant black iron oxide with heavy metals controlled to As ≤3 ppm, Pb ≤10 ppm, Hg ≤1 ppm. Our low heavy metal series meets strict international safety standards.

Application Fit and Process Considerations

Black iron oxide is selected over carbon black when ease of dispersion, chemical stability, or regulatory compliance is critical. We help you match the right grade to your matrix.

  • Construction: For concrete, tiles, and asphalt, use grades with high alkali resistance and low water-soluble salts. Dosage typically 0.5–5% by dry weight.
  • Coatings: Fine grades like 318 provide deep color and anti-corrosive properties. Micronized versions improve gloss and dispersion.
  • Plastics & Rubber: Coarser grades like 722 offer lower oil absorption and cost efficiency. Thermal stability up to 300°C suits most processing.
  • Food & Pharma: E172 grades are produced under GMP conditions with dedicated packaging to meet EFSA and FDA requirements.
  • Magnetic Materials: High-purity Fe₃O₄ with controlled particle size is essential for ferrite cores and EMI shielding.

Surface Treatment and Dispersion Optimization

We offer hydrophilic or hydrophobic surface treatments to improve wetting in water-borne or solvent-borne systems. Our micronized series reduces oil absorption to 15–22 g/100g and achieves finer grind (15–25 µm) for high-gloss coatings. Silane or stearic acid coatings are available for demanding formulations.

Quality Assurance and Compliance

Every batch is tested for Fe₃O₄ content, particle size, oil absorption, moisture, and tinting strength. We provide a Certificate of Analysis (CoA) with each shipment. For E172 grades, third-party test reports (SGS, Intertek, BV) can be arranged. Our production follows ISO 1248 and EN 12878 standards where applicable.

Packaging and Logistics

We supply in 25 kg paper bags with PE liner, 500–1250 kg jumbo bags, and sample packs (1 kg, 5 kg). Custom packaging for food-grade batches is available. All shipments include SDS and, if required, Declaration of Conformity.

Information We Use to Configure Your Solution

To prepare a precise quotation and grade recommendation, we need the following project details:

  • Application (concrete, coating, plastic, food, magnetic, etc.)
  • Resin or binder system and solvent type
  • Required tinting strength and color target (e.g., L* value)
  • Processing temperature and method
  • Regulatory requirements (E172, FDA, etc.)
  • Annual volume and packaging preference

With this information, we match the optimal grade, surface treatment, and series (standard, micronized, low heavy metal) to your process.

Frequently Asked Questions

What is the difference between Iron Oxide Black 318 and 330?

318 is a finer particle grade (D50 0.1–0.3 µm) with higher tinting strength (100–110%), ideal for deep black in coatings and cosmetics. 330 has a mid-range particle size (0.3–0.6 µm) and balanced dispersion, making it the most versatile for construction and general paints.

Can you supply E172 food-grade black iron oxide?

Yes. We produce E172-compliant grades with heavy metals controlled to As ≤3 ppm, Pb ≤10 ppm, Hg ≤1 ppm. Batches are manufactured under GMP and come with third-party test reports.

How does black iron oxide compare to carbon black in coatings?

Carbon black offers deeper jetness at very low loadings but is harder to disperse and prone to flocculation. Iron oxide black disperses more easily, provides better stability, and adds mild anticorrosive properties. It is also available in food-compliant grades.

What is the shelf life of iron oxide black powder?

In sealed, dry storage below 40°C, the shelf life is typically 5–10 years. The pigment is chemically stable; moisture and contamination are the main risks. We recommend keeping bags sealed until use.

Do you offer custom packaging for bulk orders?

Yes. We provide 25 kg bags, jumbo bags (500–1250 kg), and custom packaging for food-grade or special requirements. Sample quantities are available for testing.

Related Products and Categories

Our portfolio also includes Iron Oxide Pigment, Products, Iron Oxide Red for applications with different operating ranges, interfaces or integration requirements.