​Iron Oxide Brown color ( 50 g )

Iron Oxide Brown

Iron oxide brown, also known as Pigment Brown 6 (or Pigment Brown 7 in some cases), is a synthetic inorganic pigment primarily composed of iron oxide. It is widely used for its warm, earthy tones and high opacity, making it a popular choice for a variety of applications, including paints, coatings, plastics, and ceramics. The pigment is derived from natural iron oxide sources or synthesized by the calcination process, resulting in a stable and durable colorant.

Chemical Composition:

• Chemical Formula: Fe2O3 · xH2O (hydrated iron oxide)
• CAS Number: 51274-00-1 (for Fe2O3 pigment)
• Other Names: Brown Iron Oxide, Venetian Brown, Mars Brown, Synthetic Iron Oxide Brown.

Physical Properties:

• Color: Brown (varies from reddish-brown to yellowish-brown, depending on the specific formulation and the degree of hydration).
• Form: Fine powder, typically available in a dry powder form for ease of use in various applications.
• Density: 3.5 - 4.0 g/cm³ (approximate range depending on formulation) stable across a wide pH range.
• Stability: High stability, resistant to weathering, UV degradation, and most environmental conditions.

Manufacturing Process:

Iron oxide brown pigments are typically produced by:

1. The Precipitation Method: This process involves precipitating iron salts, such as iron sulfate or iron chloride, from solutions and then heating the resulting product under controlled conditions to produce iron oxide in the brown color range.
2. The Calcination Method: Hydrated iron oxide is subjected to controlled heating (calcination) to produce the desired brown pigment. The calcination process can vary the hue of the pigment based on the temperature and duration of heating.

The final color of iron oxide brown can range from a reddish-brown to a more yellowish-brown, depending on factors like particle size, degree of hydration, and specific treatment.

Uses and Applications:

Iron oxide brown is used extensively in various industries because of its rich color, stability, and environmental safety. Here are some common uses:.

1. Cosmetics:

• Iron oxide brown is used in various cosmetic products like foundation, bronzer, and eyeshadows, providing natural, earthy hues.
• Usage rate: Typically ranges from 1% to 3%, depending on the product formulation and the desired depth of color.
• Mix 1/8 to 1/2 tea spoon of the oxide powder with distilled water for every 500 grams of the soap oils.

2. Ceramics and Glass:

• Iron oxide brown is widely used in ceramics, pottery, and glass for producing earthy, natural tones. It is applied as a glaze or as part of the ceramic body to give rich brown tones.
• Usage rate: In ceramic glazes, usage is typically 2% to 10% depending on the type of ceramic product and the intensity of color required.

3. Construction Materials (Concrete, Mortar, etc.):

• Iron oxide brown is often used in coloring construction materials such as concrete, mortar, and tiles, providing long-lasting, weather-resistant hues.
• Usage rate: In concrete, typical usage is between 0.5% to 3% by weight of the cement

Key Advantages:

• Durability and Stability: Iron oxide brown pigments offer high resistance to UV light, weathering, and temperature fluctuations, making them suitable for both indoor and outdoor applications.
• Environmental Safety: Iron oxide brown is considered non-toxic and environmentally friendly, making it ideal for use in consumer products like cosmetics and children's toys.
• Lightfastness: Excellent lightfastness ensures that the color will not fade over time, even when exposed to sunlight.
• Heat Resistance: It is capable of withstanding high temperatures, making it suitable for industrial applications where heat resistance is required.
• Cost-Effective: Iron oxide brown is relatively inexpensive compared to organic pigments, offering an affordable alternative for manufacturers.

Percentage and Usage Rate:

The percentage of iron oxide brown used in various applications can vary depending on the specific formulation and desired color depth. Here are typical usage rates:.

• Cosmetics: 1% to 3% for makeup products like foundation, bronzers, and eyeshadows.
• Ceramics and Glass: 2% to 10% depending on the ceramic or glaze composition.
• Concrete and Construction Materials: 0.5% to 3% by weight of the cement..

Environmental and Safety Considerations:

Iron oxide brown is considered a non-toxic and environmentally friendly pigment. It poses no significant health hazards when handled according to standard safety guidelines. It does not degrade into harmful substances, and it is generally regarded as safe for use in a wide range of consumer and industrial applications.

Conclusion:

Iron oxide brown is a versatile and stable inorganic pigment widely used across many industries due to its warm, earthy tone and excellent durability. It is prized for its lightfastness, weather resistance, non-toxicity, and environmental safety. Typical usage rates range from 0.5% to 20%, depending on the specific application and desired color intensity. Whether used in paints, coatings, plastics, cosmetics, or construction materials, iron oxide brown continues to be a popular and reliable pigment