IRON OXIDE BROWN 686
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Technical Information
C.I.NO.:
Advantage:
Main Application Recommended: Coatings, Plastics
Features:
Iron Oxide Brown 686 features outstanding light and weather fastness, keeping its rich brown shade stable without fading. It blends well with coatings, plastics and construction materials, offering strong hiding power for even coverage with little usage. Also, it is non-toxic, heat-resistant and meets industrial safety standards.
Recommended Application:
wall bricks, cements, paving bricks, paintings, coatings, plastics, rubber and so on
Product Overview
Iron Oxide Brown 686 is a robust inorganic brown pigment formulated from a synergistic blend of three iron oxide components: PY42 (yellow iron oxide), PR101 (red iron oxide), and PBK11 (black iron oxide). This precisely balanced mixture delivers a rich, warm earth-brown shade with exceptional opacity, hiding power, and long-term color stability. Unlike synthetic organic browns that may fade under UV exposure, Iron Oxide Brown 686 maintains its deep brown tone even after decades of outdoor service. It is the industry-standard choice for concrete products—paving stones, roofing tiles, retaining wall blocks—as well as industrial coatings, wood stains, plastics, and rubber goods. With a content specification of ≥88.0% Fe₂O₃·αH₂O, this pigment provides high tinting efficiency and excellent dispersibility. Its non-toxic, environmentally compliant profile meets global safety regulations. ISO 9001 certified production ensures every shipment matches the reference standard for shade, strength, and physical properties.
Technical Data:
| Product Information | ||||
| Chemical Type | CAS NO. | 1309-37-1, 51274-00-1, 1317-61-9 | ||
| C. I. Name | The mixture of PY42, PR101 and PBK11 | EINECS / ELINCS NO. | 215-168-2, 257-098-5, 215-277-5 | |
| C. I. Constitution No. | Chemical Formula | |||
| Technical Performance | ||||
| Full Shade | Tint | |||
| Weather Resistance | 5 | 5 | ||
| Light Fastness | 8 | 8 | ||
| Physical Properties | ||||
| Physical Form | Powder | Moisture: | ≤1.5% | |
| Content(Fe2O3 •αH2O): | ≥88.0% | PH Value: | 4-7 | |
| Oil Absorption: | 20-30 ml/100g | Density: | 0.8-1.2g/cm3 | |
| Residue on Sieve(90 sieve): | ≤0.3% | particle shape: | irregular shape | |
| Water soluble content: | ≤0.5% | Color strength: | 95%~105% | |
| Chromatic aberration △E: | ≤1.0 | |||
| Packaging | ||||
| 25kgs/bag 1000kgs/Pallet | ||||
| Storage | Shelf Life | 5 years | ||
| Should be stored in cool, dry and ventilate place. | ||||
| TRANSPORTATION | ||||
| Avoid inversion, sunlight, moisture and crash. Avoid damage the package. | ||||
Technical Parameter Interpretation
- Weather Resistance (5/5): The maximum rating confirms that Iron Oxide Brown 686 withstands years of rain, UV, and temperature cycling without chalking or color washout, making it the benchmark pigment for exterior concrete and façade coatings.
- Light Fastness (8/8): A Blue Wool Scale rating of 8 in both full shade and tint means the brown retains its depth and warmth even when reduced with white. This makes Iron Oxide Brown 686 suitable for pastel beige and tan shades without color drift over time.
- Oil Absorption (20-30 ml/100g): Lower oil absorption compared to many organic pigments means less binder demand in paint formulations—translating to lower formulation cost and higher pigment loading capacity when needed.
- pH Value (4-7): The slightly acidic to neutral pH range is compatible with most binder systems including alkyds, acrylics, epoxies, and cementitious materials, providing formulation flexibility across multiple resin chemistries.
- Residue on Sieve ≤0.3% (90μm): Tighter sieve specification than many competing iron oxides ensures superior dispersion and a smooth, speck-free finish in thin-film coatings and high-gloss plastic applications.
- Content ≥88.0% Fe₂O₃·αH₂O: High iron oxide content translates directly to stronger tinting power, lower required dosage, and better cost efficiency per unit of color delivered.
- Moisture Content ≤1.5%: Controlled moisture level prevents caking during storage and ensures consistent metering in automated batching and dosing systems.
Why Choose Honor Pigments?
- 🌍 Global Export Expertise — Trusted by customers in 40+ countries for consistent quality and reliable supply
- ✅ Strict Quality Control — ISO 9001 certified with batch-to-batch consistency and zero-defect policy
- 💰 OEM Production Advantage — Competitive pricing without compromising pigment performance
- 🧪 Technical Support — Free color matching, formulation advice and sample testing before bulk order
📩 Need more details?
Request TDS, SDS, or a free sample for testing.
Frequently Asked Questions — Iron Oxide Brown 686
What is the difference between Iron Oxide Brown 686 and synthetic organic brown pigments?
Iron Oxide Brown 686 is an inorganic composite of yellow, red, and black iron oxides (PY42+PR101+PBK11), offering fundamentally different properties from organic browns. Key advantages include: (1) UV stability—iron oxide browns will not fade after decades of outdoor exposure, while organic browns typically degrade within months to a few years; (2) higher opacity and hiding power, requiring less pigment to achieve full coverage; (3) superior chemical resistance to acids, alkalis, and solvents; (4) non-toxic, heat-stable profile suitable for food-contact and high-temperature applications. The trade-off is that organic browns may offer slightly cleaner, more chromatic tones at very low concentrations, making them better suited for high-chroma printing inks rather than mass-tone construction applications.
Can Iron Oxide Brown 686 be used in water-based paint formulations?
Yes, Iron Oxide Brown 686 is fully compatible with water-based architectural and industrial paint systems including acrylic emulsions, styrene-acrylics, and polyurethane dispersions. Its pH range (4-7) and controlled water-soluble content (≤0.5%) ensure minimal impact on viscosity stability and long-term shelf life. For best results, pre-wet the pigment in a co-solvent or dispersant solution before mill-base addition to improve wetting speed and dispersion quality. Recommended dispersant dosage is 2-5% by pigment weight using standard polyacrylate or polyurethane dispersants. The low oil absorption (20-30 ml/100g) also allows higher pigment loading in low-VOC formulations.
What are the recommended dosage rates for Iron Oxide Brown 686 in cement and concrete?
For standard concrete coloration, the recommended dosage of Iron Oxide Brown 686 is 2-6% by weight of cement, depending on desired color depth. Lighter tan shades typically require 1-3%, medium brown 3-5%, and deep chocolate tones 5-8%. For best results, pre-blend the pigment powder with dry cement and aggregate before adding water—this ensures uniform color distribution and prevents streaking. Over-dosing beyond 10% by cement weight may affect concrete workability and compressive strength, so always conduct trial batches at production scale. The pigment can also be dispersed in water first to form a slurry for liquid dosing systems in ready-mix plants.
Is Iron Oxide Brown 686 compliant with environmental and safety regulations?
Yes. Iron oxide pigments are classified as non-hazardous and non-toxic under global chemical safety frameworks. Iron Oxide Brown 686 meets the requirements of major international regulations including EU REACH, US TSCA, and FDA 21 CFR for indirect food contact in select packaging applications. The pigment contains no heavy metals (lead, cadmium, hexavalent chromium) above regulatory detection thresholds. A Safety Data Sheet (SDS) and regulatory compliance certificate are available upon request with every shipment. Honor Pigments maintains full REACH registration and can provide pre-registration documentation for customs clearance upon request.