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EPICLON EXA-4816 High Durability/ Flexible Tough Epoxy Resin

EPICLON EXA-4816 are liquid epoxy resins that achieve both flexible toughness and high reliability to resolve the problems of conventional products like high temperature exposure durability, PCT resistance, and acid/alkali resistance.

Features

  • Excellent flexible toughness
    • Normal temperatures: High strength and elongation rate
    • High temperatures: Tough physical properties
  • High bonding properties
  • Fast curing
  • High-temperature durability
  • Moisture-resistant reliability, acid/alkali resistance

Applications

  • Automotive components
  • Semiconductors
  • Adhesives
  • Flexible printed circuit boards
  • Substrate materials
  • Resist ink curing agents
  • Flooring material coatings

EXA-4816

EXA-4816 structural formula

EXA-4816 legend

EXA-4816 matrix

Resin Physical Properties

Liquid epoxy resin
High purity (low-impurity chlorinity) compared to conventional flexible epoxy resins (alcohol ether)

  EXA-4816 EO Modified BPA
Conventional Flexibility
CTBN Modified BPA
Rubber Modified
850S (BPA)
Normal
External Appearance Light yellow liquid Light yellow liquid Yellow liquid Clear liquid
Epoxy Equivalent Weight (g/eq.) 403 358 233 188
Viscosity (25°C, mPa·s) 1,400,000 1,200 68,000 11,000
Hydrolysable Chlorine (ppm) 90 670 100 120
Total Chlorine (ppm) 1,200 19,000 1,200 1,400

Excellent Flexible Toughness

Possess exceptional elongation performance.

  • Elongation (25°C, %)

    Elongation (25°C, %)

    High values indicate better elongation ability.

  • Stress (25°C, MPa)

    Stress (25°C, MPa)

    High values indicate better stress.

  • Degree of elasticity (25°C, MPa)

    Degree of elasticity (25°C, MPa)

    High values indicate better degree of elasticity.

Dynamic viscoelasticity/mechanical physical properties during heating

    EXA-4816 EO Modified
BPA
Conventional Flexibility
CTBN Modified
BPA
Rubber Modified
850S
(BPA)
Normal
Glass Transition Temperature DMA, °C 89 33 135 139
TMA, °C 80 25 121 123
Dynamic Elastic Modulus 25°C, MPa 3,200 1,370 2,440 3,420
Tg+40°C, MPa 25 18 40 40
Cross-link Density mmol/cc 2.5 2.1 3.7 3.5
Coefficient of Linear Expansion Tg-20°C.ppm 73 87 93 61
Tg+20°C.ppm 188 252 201 188
  • Curing agent: Acid anhydride (MTHPA), Accelerator: BDMA 1 phr, Curing conditions: 110°C/3 hr + 165°C/2 hr

Flexible Toughness Comparison after High Temperature Exposure

Maintains flexible toughness after high temperature exposure (200°C/60 hr).

EXA-4816

Maintains flexible toughness (at 80°C)

Maintains flexible toughness (at 80°C)

EO Modified BPA

Turned black, became brittle (at 25°C)

Turned black, became brittle (at 25°C)

EXA-4816 - Color change before/after test (top: after, bottom: before)

Color change before/after test (top: after, bottom: before)

EO modified BPA - Color change before/after test (top: after, bottom: before)

Color change before/after test (top: after, bottom: before)

  • Curing agent: Acid anhydride (MTHPA), Accelerator: BDMA 1 phr, Curing conditions: 110°C/3 hr + 165°C/2 hr

Elongation Comparison after High Temperature Exposure

Maintains exceptional elongation after high temperature exposure (small change in flexible toughness).
Elongation (25°C, %), test conditions: 200°C/60 hr heating

  • EXA-4816

    EXA-4816

  • 850S (BPA)

    850S (BPA)

  • Test method: Bend test, Specimen: 10 mm x 70 mm x 3 mm
    Curing agent: Acid anhydride (MTHPA), Accelerator: BDMA 1 phr, Curing conditions: 110°C/3 hr + 165°C/2 hr

High Bonding Properties

Possess excellent pulling shear force.

Breaking stress (25°C, MPa)

Breaking stress (25°C, MPa)

  • * Base material: Iron/iron
  • * Curing agent: Dicyandiamide, Curing conditions: 180°C/1 hr

Fast Curing

Curing speed has been greatly improved. For a portion of curing agents, achieves a fast curability that surpasses fast-curing BPA.

Curing Agents EXA-4816 EO Modified
BPA
Conventional Flexibility
CTBN Modified
BPA
Rubber Modified
850S
(BPA)
Normal
Acid Anhydride
MHTPA (BDMA 1 phr)
150°C, sec. 87 248 135 91
Imidazole
2E4MZ
150°C, sec. 85 >1,800 184 153
Polyamine
TETA
120°C, sec. 433 >1,800 189 154
  • Test method: Cure plate method (tackiness disappearance time), measured by 70%-MEK solvent

High-temperature Durability

Even if left at high temperatures, the change in mechanical physical properties is small and there is little change in color and surface state.

  EXA-4816 EO Modified
BPA
Conventional Flexibility
CTBN Modified
BPA
Rubber Modified
850S
(BPA)
Normal
High Temperature Exposure Test (200°C/60 hr) Before After Before After Before After Before After
Bend Test Stress (25°C, MPa) 92 94 1 16 83 80 126 93
Elastic Modulus (25°C, MPa) 2,690 2,700 9 570 2,240 2,370 3,100 2,970
Elongation (25°C, %) >18 >18 >18 9.0 7.1 2.3 9.4 3.6
  • Test method: Bend test, Specimen: 10 mm x 70 mm x 3 mm
    Curing agent: Acid anhydride (MTHPA), Accelerator: BDMA 1 phr, Curing conditions: 110°C/3 hr + 165°C/2 hr

High Temperature Durability (Surface State)

High Temperature Durability (Surface State)

Moisture-resistant Reliability, Acid/Alkali Resistance

Possess excellent PCT resistance, acid resistance, and alkali resistance.

  EXA-4816 EO Modified
BPA
Conventional Flexibility
CTBN Modified
BPA
Rubber Modified
850S
(BPA)
Normal
PCT Test Specimen state (121°C, 2 atm, 2 hr) No change Bleeding No change No change
Moisture Absorptivity (%) 1.8 2.6 0.9 0.9
Acid Resistance 10%-sulfuric acid, room temperature, 3 days No change No change No change No change
Alkali Resistance 10%-caustic alkali, room temperature, 3 days No change Surface corrosion No change No change
  • Test method: Bend test, Specimen: 10 mm x 70 mm x 3 mm
    Curing agent: Acid anhydride (MTHPA), Accelerator: BDMA 1 phr, Curing conditions: 110°C/3 hr + 165°C/2 hr
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