MTHPA liquid anhydride CAS No. 11070-44-3
MTHPA (Methyl Tetrahydrophthalic Anhydride) High-Performance Epoxy Curing Agent for Electrical Insulation, Encapsulation & Composite Applications What is MTHPA? MTHPA (Methyl Tetrahydrophthalic Anhydride), also known as Methyltetrahydrophthalic Anhydride, is a high-performance cyclic acid anhydride curing agent widely used in epoxy resin systems requiring superior electrical insulation, heat resistance, low viscosity, and mechanical stability. As a modified anhydride hardener, MTHPA provides excellent dielectric properties, thermal endurance, moisture resistance, and processability, making it an ideal curing agent for electrical encapsulation, transformer insulation, composite materials, and electronic potting compounds. MTHPA is extensively utilized in industries such as: * Electrical & Electronics Encapsulation * High Voltage Insulation Systems * Dry-Type Transformers * CT/PT Instrument Transformers * Insulators & Bushings * Wind Power Composite Materials * Adhesives & Structural Composites * Industrial Coatings and Casting Systems (Methyl Tetrahydrophthalic Anhydride, CAS No. 11070-44-3) is a high-performance anhydride curing agentwidely used in the epoxy resin industry. With its excellent balance of low toxicity, stable performance, and compatibility with various epoxy systems, MTHPA has become the preferred choice for advanced applications in wind energy, photovoltaic, LED, automotive electronics, rail transit, and high-voltage insulation materials.
Description
MTHPA (Methyl Tetrahydrophthalic Anhydride)
Product Overview
MTHPA (Methyl Tetrahydrophthalic Anhydride, CAS No. 11070-44-3) is a high-performance anhydride curing agentwidely used in the epoxy resin industry. With its excellent balance of low toxicity, stable performance, and compatibility with various epoxy systems, MTHPA has become the preferred choice for advanced applications in wind energy, photovoltaic, LED, automotive electronics, rail transit, and high-voltage insulation materials.
Zhejiang Heyi Chemical Co., Ltd. is more than a manufacturer;it is one of China's pioneering enterprises in the curing agent industry.Originating in 1997, our core team is based in Zhejiang, close to the major ports of Shanghai and Ningbo, connecting reliable Chinese manufacturing with global markets.Within over 6,000 square meters of production space, more than 200 professionals use industry-leading automation, precision equipment, and advanced production lines to drive innovation.Our products meet the highest industry standards, with pale color, low odor, and low free acid content, serving electrical and electronic encapsulation, insulation materials, rail transit, and epoxy composites.Exported to over 30 countries, including leading global chemical companies, Heyi Chemical looks forward to long-term, mutually beneficial partnerships.
Key Features & Advantages
- High Performance: Provides outstanding electrical insulation, mechanical strength, and chemical resistance.
- Low Viscosity: Ensures easy processing, good fluidity, and excellent impregnation performance.
- Thermal Stability: Maintains stability and reliability under long-term heat exposure.
- Environmental Advantage: Low volatility, low toxicity, and safer for operators compared with conventional curing agents.
- Flexible Application: Suitable for casting, impregnation, lamination, and encapsulation processes.
Applications
- Wind Power & Photovoltaic: Used in epoxy systems for rotor blades, solar junction boxes, and electronic encapsulation.
- Rail Transit: Applied in insulation parts for high-speed trains and subways.
- LED & Electronics: Ensures high clarity and stability for LED encapsulation and semiconductor protection.
- Automotive & EV: Used in electric vehicle charging modules, motors, and control units.
- General Electrical Insulation: Transformers, capacitors, and switchgear.
Customer Concerns & Our Solutions
- Quality: Each batch of MTHPA undergoes strict quality inspection (GC, purity, acid value, color index, etc.) before shipment. ISO-certified production process guarantees consistent quality.
- Packaging & Transportation: Available in IBC tanks (1100kg), steel drums (240kg), or customized packaging. Packaging is moisture-proof, leak-proof, and export-certified to ensure safe delivery.
- Price Advantage: Competitive factory-direct pricing thanks to large-scale production (capacity 80,000+ tons/year).
- Logistics: Flexible global logistics solutions, ensuring on-time delivery by sea, air, or multimodal transport.
Why Choose Us
- Manufacturer, Not Trader: Direct supply from Zhejiang Heyi Chemical Co., Ltd. ensures cost competitiveness and reliability.
- Large Production Capacity: Over 80,000 tons annual capacity, ensuring stable and long-term supply.
- Global Compliance: Products meet REACH, RoHS, and other international standards.
- Technical Support: Professional R&D team offers formulation guidance, product customization, and after-sales service.
FAQ (Example For Product Pages)
Q1: What is the typical purity of your MTHPA?
A1: ≥ 99%, with strict batch-to-batch control.
Q2: Can you provide free samples?
A2: Yes, up to 1kg sample can be provided for testing.
Q3: What is the shelf life of MTHPA?
A3: Typically 12 months when stored in a cool, dry, and ventilated place.
Q4: Do you support customized packaging?
A4: Yes, we offer tailored packaging solutions according to customer requirements.
After-Sales Service
- Technical Support: Guidance for formulation, application, and curing process.
- Replacement Guarantee: If product quality does not meet agreed specifications, replacement or refund will be provided.
- Customer Care: Professional sales team ensures prompt response to inquiries, shipment tracking, and continuous service.
Technical Specifications
| Specifications and Models | HMT9601(HN2000) | HMT9602 | HMT9603 | HMT9604 | HMT9605 | HMT9608(HN2200) |
| Appearance | Light yellow transparentliquid | Light yellow transparentliquid | Light yellow transparentliquid | Light yellow transparentliquid | Light yellow transparentliquid | Light yellow transparentliquid |
| Color (Platinum-Cobalt Scale) | ≤50# | ≤150# | ≤30# | ≤200# | ≤150# | ≤200# |
| Crystallization Point(℃) | ≤-15 | ≤-15 | ≤-15 | ≤-15 | ≤-15 | ≤-15 |
| Acid Value (mgKOH/g) | 660.0-680.0 | 660.0-680.0 | 660.0-680.0 | 660.0-680.0 | 660.0-680.0 | 660.0-680.0 |
| Aydride group content (%) | ≥41.00 | ≥41.00 | ≥41.00 | ≥41.00 | ≥41.00 | ≥41.00 |
| Viscosity (mPa.s, 25°C) | 30～50 | 30～50 | 30～40 | 30～60 | 30～50 | 40～70 |
| Density (g/cm³ , 20°C) | 1.210±0.05 | 1.210±0.05 | 1.210±0.05 | 1.210±0.05 | 1.210±0.05 | 1.210±0.05 |
| Free acid content (%) | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.3 | ≤0.3 |
| Volatile content (120°C) | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 | ≤2.0 |
| Anhydride equivalent (g/mol) | 166 | 166 | 166 | 166 | 166 | 166 |
| Flash point (°C) | 158 | 158 | 158 | 158 | 158 | 158 |
| Heating loss(％) (125℃,2 hours) |
<1.00 | <1.00 | <1.00 | <1.00 | <1.00 | <1.00 |
| Application | Photovoltaic (PV) | dark-colored potting compound | light-colored potting compound | Glass fiber | Electrical casting,Oil pipelines,Pultruded rods | Customized products |
- Download HMT-9601 TDS
- Download HMT-9602 TDS
- Download HMT-9603 TDS
- Download HMT-9604 TDS
- Download HMT-9605 TDS
- Download HMT-9608 TDS
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