Methyltetrahydrophthalic anhydride (MTHPA) CAS 26590-20-5

Chemical Name: Methyltetrahydrophthalic anhydride / MTHPA
CAS No.: 26590-20-5
Molecular Formula: C9H10O3
Molecular weight: 166.17
Appearance: Light yellow transparent liquid
Assay: 98%

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Methyltetrahydrophthalic Anhydride (MTHPA) CAS 26590-20-5 Technical Guide

Contents

Product Specifications & Comparative Analysis

Parameter MTHPA HHPA PA
CAS Number 26590-20-5 85-42-7 85-44-9
Molecular Formula C9H10O3 C8H8O3 C8H4O3
Melting Point (°C) -15 to -10 33-36 131-134
Viscosity @25°C (mPa·s) 35-50 45-60 Solid
Reactivity (Epoxy Equivalent) 165-175 g/eq 180-190 g/eq 148-152 g/eq

Industrial Applications & Functional Advantages

Primary Functional Characteristics:

  • Low-temperature curing capability (60-120°C operational range)
  • High thermal stability (Tg 120-150°C post-cure)
  • 0.1% volatility @100°C (superior to 85% anhydride alternatives)

Industry-Specific Implementations:

  • Electronics: Underfill encapsulation for BGA/CSP components
  • Aerospace: Carbon fiber composite matrix formulation
  • Electrical: Dry-type transformer insulation systems
  • Renewables: Wind turbine blade structural adhesives

Operational Protocols & Safety Guidelines

Optimal Curing Formulation:

  • Epoxy:MTHPA ratio = 100:85 (weight basis)
  • Accelerator recommendation: 0.5-1.0% BDMA or 2-Ethyl-4-methylimidazole
  • Gel time @100°C: 90-120 minutes (varies by accelerator concentration)

Safety Compliance Requirements:

  • PPE: Chemical-resistant gloves (Butyl rubber/Nitrile)
  • Ventilation: LEV system maintaining <50% TLV (1 mg/m³)
  • Spill management: Neutralize with sodium carbonate solution

Industry-Specific Implementation Case Studies

Case 1: High-Voltage Insulator Manufacturing

  • Client: Global electrical components supplier
  • Challenge: Achieving CTI ≥600V in switchgear epoxy
  • Solution: MTHPA-based formulation with silica reinforcement
  • Outcome: 22% improvement in dielectric strength vs. HHPA systems

Case 2: Marine Composite Production

  • Client: Shipbuilding material manufacturer
  • Challenge: Saltwater immersion stability (>10,000 hrs)
  • Solution: MTHPA/DDS hybrid curing system
  • Outcome: 0.3% water absorption @1000hrs salt spray

Verified Client Success Documentation

Client A: Automotive Electronics Tier-1 Supplier

  • Application: ECU potting compounds
  • Technical Achievement: -40°C to 165°C thermal cycling stability
  • Commercial Impact: 18% production cost reduction vs. polyamide systems

Client B: Wind Energy OEM

  • Application: Rotor blade adhesive formulation
  • Technical Achievement: 82 MPa shear strength @-30°C
  • Commercial Impact: 35% faster curing vs. competitive anhydrides

Technical Consultation & Commercial Inquiry

Value-Added Services:

  • Free sample provision (500g minimum order)
  • Customized curing system development
  • Technical white papers: 12 specialized documents available

Contact our application engineers for formulation optimization:

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