At EverStar Group, we manufacture high-purity Mah Maleic Anhydride with ≥99.5% purity, supplied in dust-reduced white briquettes and flakes from our own large-scale production facility. With 13+ years of chemical manufacturing experience, we maintain over 5,000 tons of on-site inventory, ensuring 99.5% on-time delivery to customers in more than 50 countries. Our product meets EU REACH standards and undergoes strict quality control from raw material inspection to final product analysis. Whether you need trial batches or full container loads, our in-house R&D lab and experienced technical team provide 24-hour custom formulation support and responsive after-sales service.

The product is a highly reactive cyclic anhydride featuring both a carbon-carbon double bond and an anhydride functional group.
This dual reactivity makes it indispensable for your production needs:
You get both addition and condensation reaction capabilities in one compound, allowing you to tailor mechanical and thermal properties precisely.
| Parameter | Specification |
|---|---|
| Appearance | White briquettes / flakes |
| Purity | ≥99.5% |
| Maleic Acid Content | ≤0.5% |
| Molten Color (Pt-Co) | ≤25 |
| Freezing Point | ≥52.5°C |
| CAS Number | 108-31-6 |
| Package | 25 kg bag |
Our briquette form significantly reduces dust exposure compared to powder, improving workplace safety and material handling efficiency in your plant.
Note: Product specifications may be adjusted during product iteration and optimization. Please submit your inquiry to us for the latest data and official COA documents.
Why Choose EverStar's Mah Maleic Anhydride?Consistent High Purity for Reliable Reactivity
With ≥99.5% virtue affirmed by Gas Chromatography (GC), you maintain a strategic distance from catalyst harming and undesirable side responses amid polymerization. Our moo maleic corrosive substance (≤0.5%) anticipates hardware erosion and keeps up batch-to-batch consistency.
Traditional powder makes dealing with challenges and working environment risks. Our briquette frame minimizes airborne particles whereas keeping up full reactivity, making stacking and dosing more secure and cleaner.
Our robotized generation lines and 5,000+ ton stock capacity cruel you never confront supply disturbances. We transport trial orders and full holders with break even with proficiency, sponsored by 99.5% on-time conveyance execution.
Every batch undergoes rigorous testing according to ASTM D3504 and ISO standards:
You receive comprehensive COA documentation with each shipment for your quality management records.
Eliminate middleman markups. Our in-house R&D team and chemical engineers provide:

Mah Maleic Anhydride supplies approximately 50% of global demand in this sector. You can produce:
Graft product onto polyolefin chains (MAH-g-PE, MAH-g-PP) to create strong interfacial bonds between inorganic fillers and plastic matrices. This technology enables:
Through hydrogenation processes, you convert maleic anhydride into critical intermediates for:
React the product with polyisobutylene to produce PIBSA (Polyisobutylene Succinic Anhydride), an ashless dispersant that prevents sludge in high-temperature engine oils.
Serve as an intermediate for malathion insecticide and maleic hydrazide plant growth regulators.
Your obtainment choice depends on steady quality. We prioritize four basic assessment points:
1. Liquid Color Stability
Heat Soundness Test (APHA) at 140°C for 2 hours. A move past 40-50 APHA shows pollutions that cause tar discoloration. Our clumps reliably remain inside specification.
2. Immaculateness Analysis
Gas Chromatography affirms negligible follow hydrocarbons, guaranteeing clean responses in your downstream processes.
3. Maleic Corrosive Monitoring
Titration confirms that dampness introduction hasn't caused hydrolysis amid capacity. This secures your hardware from erosion and avoids polymerization failures.
4. Fiery remains Substance Control
Maintained underneath 0.005% to avoid catalyst harming in delicate chemical blend Applications.
All testing takes after ASTM D3504 and ISO guidelines, with full documentation given.
| Advantage | Your Benefit |
|---|---|
| 13+ Years Experience | Proven manufacturing expertise you can rely on |
| Own Factory | Direct control over quality and lead times |
| 5,000+ Tons Inventory | Immediate availability for urgent orders |
| EU REACH Compliant | Simplified regulatory approval for European markets |
| 24-Hour Custom Development | Rapid formula adaptation for unique requirements |
| 50+ Countries Served | Proven export logistics and documentation |
| 99.5% On-Time Delivery | Consistent supply for your production schedule |
| Flexible MOQ | Support from trial batches to container loads |
We understand that delivery reliability directly impacts your production schedule. Our logistics capabilities include:
From small trial orders to recurring bulk shipments, we maintain the same commitment to speed and accuracy.

Q: What virtue level can you ensure for each batch?
A: Each group of our item keeps up ≥99.5% immaculateness, confirmed by Gas Chromatography. We give a Certificate of Investigation with each shipment appearing correct virtue, maleic corrosive substance, liquid color, and solidifying point measurements.
Q: How do briquettes compare to powder or pieces for handling?
A: Briquettes altogether diminish airborne tidy amid stacking and dosing, progressing work environment security and decreasing fabric misfortune. They break up at the same rate as chips once dissolved, so you get simpler dealing with without relinquishing reactivity.
Q: What is your least arrange quantity?
A: We offer adaptable MOQ choices beginning from trial bunches of a few hundred kilograms up to full holder loads (20+ tons). This permits you to test our item in your handle some time recently committing to bigger volumes.
Q: How do you anticipate dampness defilement amid capacity and shipping?
A: Our item is bundled in moisture-resistant 25 kg sacks with inward PE liners. We store stock in climate-controlled distribution centers and utilize fixed holders for sea cargo to minimize hydrolysis chance amid transit.
Q: Can you customize details or give specialized bolster for our particular application?
A: Yes. Our in-house R&D research facility offers 24-hour custom definition advancement. Whether you require particular molecule measure conveyance, altered bundling, or application direction for polymer joining or gum generation, our chemical engineers give one-on-one specialized consultation.
Q: What quality guidelines and Certifications does your item meet?
A: Our generation office keeps up ISO 9001 certification and EU REACH compliance. Testing takes after ASTM D3504 and ISO benchmarks. We give comprehensive documentation counting COA, MSDS, and REACH enlistment points of interest with each shipment.
Q: What is your ordinary lead time for orders?
A: For in-stock standard grades, we transport inside 3-5 commerce days after arrange affirmation. Custom details ordinarily require 10-15 days for improvement and generation. Our 99.5% on-time conveyance rate reflects our commitment to assembly your schedule.
Q: How steady is your supply amid periods of tall showcase demand?
A: Our 5,000+ ton on-site stock and large-scale robotized generation lines give supply security indeed amid showcase changes. We keep up key stock levels and can scale generation quickly to meet expanded request from existing clients.
When you choose EverStar Group, you gain more than a supplier of Mah Maleic Anhydride—you gain a manufacturing partner committed to your success.
Email: info@cneverstar.com