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Demei focuses on the research, development, and production of inorganic iron oxide pigments. Our pigments cover iron oxide red, yellow, black, brown, green, orange, blue, etc.
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Product Details
Comprehensive information about our iron oxide pigments including specifications, applications, advantages, and more
Alkali Resistant Pigment Materials
High-performance inorganic pigment with excellent color stability, weather resistance, and broad application range.
Specialist in Alkali-Stable Inorganic Chemistry
At Deqing Demi Pigment Technology Co., Ltd., we prioritize the chemical stability of our pigments in harsh environments. Our alkali-resistant range is the result of focused research into the interaction between iron oxides and high-calcium substrates. We provide manufacturers of cement-based specialty products with the confidence that their colors will not wash out, shift to yellow, or fade when applied to alkaline surfaces or mixed into caustic chemical systems.
Alkaline Application Fields
- Fresh Concrete: Integral coloring where the pH is naturally high during the cure.
- Swimming Pool Finishes: Pigments for underwater plaster systems exposed to alkaline chemicals.
- Industrial Floor Cleaners: Stable colorants for highly alkaline chemical formulations.
- Geopolymers: Pigmentation for alkali-activated cementless binders.
Alkali Resistance Technical Specifications
| Property | Measurement | Standard |
| Alkali Resistance | Grade 5 (No Change) | DIN EN ISO 105-B02 |
| Water Soluble Chloride | Max 0.01% | ISO 787-13 |
| CaO Content | Max 0.3% | XRF Analysis |
| Dispersibility | Excellent | Hegman Gauge |
| pH Stability Range | 4 - 13.5 | Internal Test |
Functional Characteristics for High pH
- Chemical Durability: Resists the "bleaching" effect of calcium hydroxide and sodium hydroxide.
- Color Retention: Maintains original hue even when applied to "green" concrete that hasn't fully carbonated.
- Purity Levels: Low trace element content ensures no unwanted chemical side reactions.
- Water Stability: Does not dissolve or bleed in aqueous systems with high pH.
Q: Why do organic pigments fail in concrete?
A: Most organic pigments are sensitive to alkali. High pH levels break down their chemical bonds, leading to rapid color loss. Our inorganic oxides are naturally stable in these conditions.
Q: Can these be used in silicate-based paints?
A: Yes, these are specifically recommended for silicate and potassium-silicate paints, which are highly alkaline and require completely inorganic pigmentation.
Precision Synthesis and Verification
Our production process for alkali-resistant grades involves high-temperature calcination to ensure the oxide is in its most stable state. We verify this resistance by submerging samples in a saturated lime solution for extended periods.
Technical Consultation: We help clients formulate products for extreme environments, providing data on how our pigments behave in contact with specific alkaline salts and chemical accelerators.
Stability Mapping in Basic Media
The science of alkali resistance is rooted in the "Pourbaix Diagram" of the specific metal oxide. Our pigments are chosen because their stable phase coincides with the pH range of construction materials. We use spectrophotometric monitoring to ensure that the a* and b* color coordinates do not drift by more than 0.5 units when the pigment is suspended in a pH 13 solution for 72 hours. This provides a quantitative guarantee of stability for manufacturers of high-performance cementitious systems.
About Demei
Demei Chemical Co., Ltd. specializes in the research, development, and production of inorganic iron oxide pigments. With over a decade of experience in the field, we have established ourselves as a leading manufacturer with advanced production facilities and a dedicated R&D team.
We are China Custom Alkali Resistant Pigment Materials Manufacturers and Wholesale Alkali Resistant Pigment Materials Suppliers, Factory. Our comprehensive pigment range includes iron oxide red, yellow, black, brown, green, orange, and blue. We produce high-performance and high-stability composite iron oxide pigments with three specialized series: Standard, Micronized, and Low Heavy Metal Content levels.
Our products are exported to more than 30 countries and regions worldwide, serving diverse industries including construction, coatings, plastics, rubber, ceramics, and paper. We pride ourselves on consistent quality, excellent color properties, and reliable technical support for our global clients.
R&D Excellence
Continuous investment in research and development ensures technological leadership. Our R&D center focuses on innovative pigment formulations and application technologies.
Advanced Manufacturing
State-of-the-art production facilities with automated control systems ensure consistent quality and large-scale production capacity of over 50,000 tons annually.
Quality Assurance
Strict quality control at every production stage. Certified to ISO 9001:2015, our pigments meet international standards for color consistency and performance.
Global Reach
Extensive distribution network across Asia, Europe, Americas, and Africa. We provide customized solutions and technical support for diverse market requirements.
Core Products
We provide a full range of high-quality inorganic iron oxide pigments, widely used in building materials, coatings, plastics, rubber, ceramics and other industries.
Product Series
We offer three specialized series of iron oxide pigments to meet diverse industry requirements and application scenarios
Standard Series
Conventional particle size iron oxide pigments suitable for most industrial applications. Excellent dispersibility and tinting strength with high cost-performance ratio.
Micronized Series
Ultra-fine particle size with uniform distribution. Ideal for high-end coatings, plastics, and applications requiring superior fineness and smooth finish.
Low Heavy Metal Series
Strictly controlled heavy metal content meeting international environmental standards. Suitable for toys, food packaging, and safety-sensitive applications.
Social Responsibility
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.
Environmental Protection
Implementing green production processes, reducing waste emissions, and actively promoting circular economy principles.
Safe Production
Comprehensive safety management system ensuring controlled and secure operations throughout the production process.
Employee Health
Providing healthy working environments, regular health check-ups, and focusing on physical and mental well-being of our employees.
Community Contribution
Active participation in community development, supporting educational initiatives, and giving back to society.
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Phone
86-572-8035379
86-13666526593 -
Hours
Monday-Friday: 9am to 6pm
Saturday, Sunday: Closed -
Address
20th Floor, Mibei Chuanggongchang No. 650 Yunxiu South Road, Deqing County, Huzhou City, Zhejiang Province, China(Sales Office)
