MHHPA Curing Agent For Electrical Insulation
MHHPA functions as an anhydride curing agent in epoxy resin systems used for electrical and electronic components. It is evaluated in applications where processability, thermal performance, electrical insulation and the properties of the cured resin must meet defined manufacturing requirements.
Description
MHHPA functions as an anhydride curing agent in epoxy resin systems used for electrical and electronic components. It is evaluated in applications where processability, thermal performance, electrical insulation and the properties of the cured resin must meet defined manufacturing requirements.
Typical Physical & Chemical Specifications
|
Property |
Typical Specification |
Test Method / Standard |
|
Chemical Name |
Methylhexahydrophthalic Anhydride (MHHPA) |
- |
|
CAS Number |
25550-51-0 / 34036-80-0 |
Industry Standard |
|
Appearance |
Clear, transparent liquid free of suspended matter |
Visual Inspection |
|
Purity / MHHPA Content |
>= 99.0% |
Gas Chromatography (GC) |
|
Color (Hazen / APHA) |
<= 40 |
ASTM D1209 |
|
Viscosity (at 25 deg C) |
40 - 60 mPa*s |
ASTM D445 |
|
Acid Value |
650 - 680 mg KOH/g |
ASTM D974 |
|
Free Acid |
<= 1.0% |
Titration Method |
|
Water Content |
<= 0.1% |
Karl Fischer |
Application Scope
Electrical Castings: High-voltage insulators, switchgear components, and molded electrical parts.
Potting & Encapsulation: Protection of sensitive electronic modules, sensors, and passive components.
Transformer & Coil Impregnation: Dry-type transformers, ignition coils, and heavy-duty motor windings.
Outdoor Insulation: Weather-resistant and UV-stable outdoor electrical components.
Epoxy Composites: Selected filament winding and pultrusion composite manufacturing.
Formulation & Processing Guidelines
Epoxy Resin Compatibility & EEW: Calculate the stoichiometric requirement based on the Epoxy Equivalent Weight (EEW) of your base resin and the Anhydride Equivalent Weight (AEW) of MHHPA. A starting stoichiometric ratio of 0.85 to 1.0 equivalent of anhydride per equivalent of epoxy is commonly evaluated.
Viscosity & Filler Loading: The low initial viscosity of MHHPA permits high loading levels of mineral fillers (such as silica or alumina) while maintaining adequate flow, mold-filling, and impregnation characteristics at processing temperatures.
Accelerator Selection: Tertiary amine or metal salt catalysts are typically required to control pot life, gel time, and cure kinetics. Dosage must be optimized through laboratory trials.
Curing Schedule & Thermal Management: Optimize ramp rates, gel temperatures, and post-cure cycles relative to component geometry and thickness to minimize residual stress and exothermic cracking.
Storage, Shelf Life and Safe Handling Guidelines
Storage Conditions: Store in original, tightly sealed containers in a dry, well-ventilated area away from direct sunlight and moisture. Recommended storage temperature: 15 to 35 deg C.
Shelf Life: 12 months from the manufacturing date when stored under recommended unopened conditions.
Handling Precautions: Avoid direct skin and eye contact. Wear appropriate personal protective equipment (PPE) including chemical-resistant gloves, safety goggles, and protective clothing. Use with adequate local exhaust ventilation during mixing and processing.
Crystallization Handling: If crystallization occurs due to low-temperature exposure during storage, gently heat the closed container in a warm water bath or designated hot room (not exceeding 50 deg C) and mix thoroughly until completely liquid before use.
Regulatory Compliance, Quality Control & Packaging
Documentation Support: Batch-specific COA, TDS, and SDS provided with shipments. Regulatory statements (REACH compliance, RoHS, TSCA) available upon request.
Packaging Options:
• 220 kg galvanized iron drums
• 1,100 kg IBC tanks / Totes
• Bulk ISO tank shipments (subject to minimum volume)
Storage & Handling: MHHPA is moisture-sensitive. Store in tightly sealed containers in a cool, dry, and well-ventilated area to prevent hydrolysis or crystallization.
FAQ
Q: What is the primary function of MHHPA in epoxy formulations?
A: MHHPA acts as a cross-linking (curing) agent for epoxy resins, providing thermal, mechanical, and electrical insulation properties suited for electrical and electronic manufacturing.
Q: Can MHHPA be cured without an accelerator?
A: Practical cure speeds and cross-link densities generally require an appropriate accelerator system. Final catalyst packages should be validated through laboratory testing.
Q: What information is required to request a commercial quotation?
A: Please specify your required grade/specification, estimated annual consumption (EAC), trial batch size, destination port, and preferred Incoterms (FOB/CIF/DDP).
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