Testing Methods (SHIKOH)


  • UV curable component: Photoinitiator (Omnirad 184) = 100:4 *Diluted to NV50% in ethyl acetate when oligomer viscosity is high


  • Pencil hardness: Coated to a dry thickness of 10μm on 125 μm treated PET film using a bar coater
  • Tensile strength: Coated to a dry thickness of 100μm on PET film using an applicator
  • Adhesion: Diluted in isopropyl alcohol (30% oligomer) and coated to a dry thickness of 5-10μm on various materials using a bar coater
  • Optical properties: Coated to dry thickness of 5-10μm on PET film
  • Surface resistance: Coated to a dry thickness of 5-10μm on treated PET film using a bar coater


Resins that contain an organic solvent or are diluted in an organic solvent were dried as follows.

  • Diluting solvent (ethyl acetate, methyl ethyl ketone): 60℃ × 3 min
  • Diluting solvent (butyl acetate, toluene, methyl isobutyl ketone, and other high-boiling solvents): 90℃ × 3min

UV irradiation

  • Hard types and medium-hard types: 80W/cm high-pressure mercury lamp × 18cmH × 5m/min × 2 pass (total irradiation: 450mJ/cm2)
  • Soft types: 80W/cm high-pressure mercury lamp × 18cmH × 2.5m/min × 2 pass (total irradiation: 800mJ/cm2)

Measuring methods

  1. (1)Pencil hardness: Compliant with JIS K 5600 (load:750g)
  2. (2)Adhesion: Compliant with JIS K 5600, evaluated according to a tape peel test (1mm cross cut)
  3. (3)Tensile strength: 23℃ × 50%RH, Test sample: 15 mm-wide strip, Distance between chucks: 25mm, Tensile speed: 10mm/min, elongation
    • Young's modulus: calculated at 1%
  4. (4)Tg (glass transition temperature): TMA method
  5. (5)Molecular weight: GPC method (Shodex GPC, three KF-806L columns)
  6. (6)Shrinkage: {(Specific gravity of cured resin - Specific gravity of resin solution before curing) / Specific gravity of cured resin}×100
  7. (7)Optical properties: Compliant with JIS K 7105
    • Refractive index: Abbe refractometer
    • Transmittance: Haze meter (transmittance of PET film included)
    • Haze: Haze meter (haze of PET film included)
  8. (8)Surface resistance: Compliant with JIS K 6911, measured under a 23℃×50%RH atmosphere using DIA Instruments' Hiresta UP resistivity meter
  9. (9)Weather resistance: Accelerated weathering test compliant with JIS 5400 (Sunshine weather meter)

This site has been created based on our technical knowledge, but does not necessarily guarantee performance in all applications. Similarly, figures contained herein are representative values, and not guaranteed values. Please use our products after fully examining their applicability, or contact us should you have any questions.



UV Curable Urethane Acrylate Oligomer SHIKOH™

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Coating Material Dept.