CAS 9011-13-6 | Styrene Maleic Anhydride Copolymer | SMA Resin for Polymer Modification & Coatings | China Manufacturer
CAS NUMBER
9011-13-6
Styrene maleic anhydride
GLASS TRANSITION
125–155°C
Varies by grade
READY STOCK
SMA540/550
Equivalent to Scripset 540/550
PACKAGING
25kg bags
Custom packaging available
KEY APPLICATIONS
Find use level and formulation data for each application below.
Product Overview
Styrene Maleic Anhydride Copolymer (SMA Resin, CAS 9011-13-6) is a high-performance functional polymer with alternating or random styrene and maleic anhydride repeating units. The reactive anhydride groups enable crosslinking, grafting, and derivatization for diverse applications. Alfa Chemical, a China-based manufacturer in Zhengzhou, supplies it with consistent quality and full documentation.
SMA exhibits excellent heat resistance with glass transition temperatures (Tg) ranging from 125°C to 155°C, depending on the grade and styrene/maleic anhydride ratio. Its compatibility with a wide range of polymers makes it a versatile additive for polymer modification, surface treatment, and coating applications.
We offer both standard and esterified SMA grades. Customizable options are available for copolymerization ratios (styrene:MA = 1:1, 2:1, 3:1, 4:1) and molecular weights from 10,000 to 200,000. We maintain large ready stock of SMA540 and SMA550, functionally equivalent to Scripset 540 and Scripset 550, available for immediate dispatch.
Supply Update: With several international producers phasing out certain SMA grades, global buyers are actively seeking reliable alternative suppliers. Alfa Chemical maintains stable stock across SMA-1000, SMA-2000, SMA-3000, and SMA-4000 series, with same-week dispatch for stock items and custom specifications available on request.
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SMA copolymer white powder, CAS 9011-13-6. Large ready stock at Alfa Chemical.
Key Features of SMA Resin
High Heat Resistance
SMA Resin has a Tg up to 155°C, offering excellent thermal stability for high-temperature processing.
Reactive Anhydride Functionality
Enables crosslinking, grafting, and derivatization for diverse chemical modifications.
Versatile Compatibility
Compatible with styrenics, acrylics, polyesters, and other polymers.
Wide Specification Range
Monomer ratios from 1:1 to 4:1, molecular weights up to 200,000.
Multiple Standard Grades
SMA-1000, SMA-2000, SMA-3000, SMA-4000 Series available from stock.
Esterified Grades Available
SMA540 and SMA550, functionally equivalent to Scripset 540and Scripset 550. Large ready stock.
Market Insight
The global SMA copolymer market was valued at approximately US$ 425 million in 2025 and is projected to reach US$ 858 million by 2032, a CAGR of 10.7%. Demand comes from automotive lightweighting, electronics miniaturization, and waterborne coatings.
At the same time, some established producers have reduced or discontinued certain SMA grades, creating supply gaps for buyers worldwide. Alfa Chemical fills this gap with direct factory supply from Zhengzhou, China and large ready stock of SMA540 and SMA550, functionally equivalent to Scripset 540 and Scripset 550.
For a detailed analysis of the current SMA supply landscape and what it means for buyers, read our full article: SMA Resin Supply Update: Grade Availability and Alternative Sources in 2026.
Esterified Grades Comparison
SMA copolymers are available in multiple grades, each with distinct styrene/maleic anhydride ratios, acid values, and molecular weights. The table below summarizes typical properties of our standard and esterified grades.
Free-flowing Powders
| Product | Chemical Type | Typical Properties | Notes | ||||
|---|---|---|---|---|---|---|---|
| Percent Solids | Acid No. | Molecular Weight | Monomer Ratio(2) | Tg °C | |||
| Scripset 520 | SMA(1) | 100% | 405 | 350,000 | 1 : 1 | 140 – 150 | Copolymer of styrene and maleic anhydride. |
| Scripset 540 | Butyl/Methyl Ester of SMA(1) | 100% | 185 | 180,000 | 1.18 : 1 | 140 – 150 | Enhanced solvent solubility. |
| Scripset 550 | Secondary Butyl Ester of SMA(1) | 100% | 175 | 105,000 | 1.40 : 1 | 140 – 150 | Enhanced solvent solubility. |
| Scripset 550E | Secondary Butyl Ester of SMA(1) | 100% | 175 | 105,000 | 1.40 : 1 | 140 – 150 | Electronics grade of Scripset 550 copolymer. Excellent clarity. |
(1) SMA = Styrene Maleic Anhydride. (2) Monomer Ratio = Styrene : Maleic Anhydride.
Alfa Chemical also supplies esterified SMA grades SMA540 and SMA550, functionally equivalent to Scripset 540 and Scripset 550, available from large ready stock for immediate dispatch. Suitable for similar application scenarios, including enhanced solvent solubility, coating additives, and specialty polymer modification. Custom esterification degrees available upon request.
Applications of SMA Resin
Polymer Modification
SMA Resin is used as a compatibilizer and modifier for engineering plastics (ABS, PC, PA, PBT). Improves impact resistance, heat resistance, and interfacial adhesion in polymer blends.
Request technical data →Nano-Dispersant
Functions as a dispersant for nanoparticles, carbon nanotubes, and graphene in organic solvents. The anhydride groups provide strong anchoring to particle surfaces, enabling stable dispersion.
Ask about dispersant grades →Surface Treatment
Used as a surface modifier for glass fibers, carbon fibers, and mineral fillers. Enhances interfacial adhesion between inorganic fillers and polymer matrices.
Request a sample →Coating & Ink Additives
Improves adhesion, hardness, and chemical resistance in coatings and printing inks. Suitable for high-performance industrial and automotive coatings.
Ask about coating grades →Standard Grades Comparison (CAS 9011-13-6)
| Item | SMA-1000 | SMA-2000 | SMA-3000 | SMA-4000 |
|---|---|---|---|---|
| CAS Number | 9011-13-6 | |||
| Styrene/MA Ratio | 1/1 | 2/1 | 3/1 | Varies by grade |
| Solid Content | ≥99% | |||
| Acid Value (mg KOH/g) | 480-520 | 255-305 | 160-200 | Varies by grade |
| Molecular Weight (Mw) | ~2,500 | ~4,500 | ~7,000 | Varies by grade |
| Glass Transition (Tg) | ~155°C | ~145°C | ~125°C | Varies by grade |
| Appearance | White to off-white powder or pellets | |||
| Packaging | 25kg bags | |||
SMA-4000 Series Details
| Grade | Acid Value (mg KOH/g) | Molecular Weight (Mw) / Tg |
|---|---|---|
| SMA-1440 | 160-200 | Mw ~7,000 / Tg ~125°C |
| SMA-17352 | ~200 | Mw ~11,000 / Tg ~130°C |
| Other 4000 series grades and custom specifications are available upon request. Contact us for detailed technical data sheets. | ||
Manufacturing & Quality Control
Alfa Chemical operates a dedicated R&D center and manufacturing facility staffed by experienced polymer chemists. Every batch of styrene maleic anhydride copolymer is manufactured under documented SOPs and validated to ensure molecular weight, acid value, and Tg meet specifications.
Quality control tests include: acid value analysis, molecular weight & Tg testing (GPC and DSC), appearance & solubility testing, and batch-to-batch consistency checks. Each shipment is accompanied by a Certificate of Analysis (COA) showing actual acid value, molecular weight, Tg, and other quality parameters.
Packaging & Shipping
Standard packaging: 25kg bags (custom packaging available upon request). International express courier for sample quantities; air freight or sea freight for bulk orders. Delivery time is 3-7 business days after payment confirmation for stock items.
COA and SDS are provided with every shipment. For special packaging or urgent requests, contact us directly.
SMA copolymer packaging: 25kg bags, custom packaging available.
Why Choose Alfa Chemical
Large Ready Stock
SMA540 and SMA550, functionally equivalent to Scripset 540 and Scripset 550, ready for immediate dispatch.
Multiple Grades Available
SMA-1000, SMA-2000, SMA-3000, SMA-4000 Series, plus esterified SMA540 and SMA550.
Wide Specification Range
Monomer ratios 1:1 to 4:1, molecular weights up to 200,000.
In-House Quality Control
Acid value, molecular weight, and Tg verified for every batch.
China Manufacturer
Direct pricing, consistent quality, ISO-compliant manufacturing with batch-traceable COA.
Frequently Asked Questions
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Q1. What is the difference between SMA grades? SMA grades differ in styrene/MA ratio, acid value, molecular weight, and Tg. Higher MA content means higher acid value and Tg. SMA-1000 (1/1) has the highest Tg; SMA-2000 (2/1) is balanced; SMA-3000 (3/1) offers lower acid value and better compatibility. |
Q2. What is the glass transition temperature (Tg) of SMA? Tg ranges from 125°C to 155°C depending on grade. SMA-1000 (1/1 ratio) has the highest Tg at ~155°C. SMA-3000 (3/1 ratio) is lower, around 125°C. Contact us for grade-specific Tg data. |
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Q3. Do you supply grades comparable to Scripset 540 or Scripset 550? Yes. Our SMA540 and SMA550 esterified grades are functionally equivalent to Scripset 540 and Scripset 550, available from large ready stock for immediate dispatch. Suitable for enhanced solvent solubility and specialty polymer modification. |
Q4. Do you have ready stock of SMA540 or SMA550 equivalent to Scripset 540/550? Yes. We maintain large ready stock of SMA540 and SMA550, functionally equivalent to Scripset 540 and Scripset 550. Stock items ship within 3–7 days. Custom esterification degrees available on request. |
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Q5. Is there a 4000 series available? Yes, the 4000 series includes grades such as SMA-1440 and SMA-17352, with specific property profiles for specialty applications. Contact us for detailed technical data sheets. |
Q6. How should SMA be stored? Store in a cool, dry place in sealed containers. Avoid moisture and direct sunlight. Shelf life is 24 months under proper storage conditions. Keep away from strong oxidizers. |
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Q7. Do you provide COA and SDS? Yes, COA and SDS are provided with every shipment. Batch-specific documents available upon request. Third-party testing can also be arranged. |
Q8. What is the minimum order quantity (MOQ)? Our standard MOQ is 1kg for stock items. For custom specifications, MOQ may vary depending on the grade and packaging. Please contact us for details. |
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Technical Resources
SMA Resin Supply Update 2026 - Ready Stock & Scripset Equivalent
What Is SMA Resin? A Complete Guide
Request COA / SDS for CAS 9011-13-6
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About Alfa Chemical: Based in Zhengzhou, China, Alfa Chemical supplies fine chemicals, biochemicals, and specialty intermediates to research and industrial customers worldwide.
Disclaimer: Scripset is a trademark of its respective owner. Alfa Chemical supplies functionally comparable SMA grades and is not affiliated with the trademark owner. For R&D and industrial use only. Not for therapeutic, diagnostic, food, or cosmetic use without specific regulatory compliance.
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