Covestro 3741-2-136 UV Cure Secondary Coating (10Kg)

Optical fiber secondary coating.

Product Benefits

• Industry-standard
• Fast cure
• Compatible with wet-on-wet or wet-on-dry coating process
• Compatible with multiple DeSolite primaries
• Patent-protected

Liquid Coating Characteristics

• Viscosity, 25°C, 4,750 mPa•s
• Viscosity, 35°C, 2,050 mPa•s
• Density, 23°C, 1121 kg•m^-3
• Liquid Refractive Index, 23°C, 1.519
• Surface tension, 23°C, 24 dynes•cm^-1

Cured Coating Characteristics (Tested at 23°C, 50% R.H.)

• Segment modulus, 2.5% strain, 731 MPa
• Elongation, 27%
• Tensile strength, 29 MPa
• Degree of Cure (UV dose at 95% of Ultimate Secant Modulus, J•cm^-2 ): 0.2
• Dynamic water sensitivity (150 µm films)
  • peak absorption, 1.6%
  • extractables, 0.8%
• Hydrogen generation (24 hrs, 80°C in air, 75 µm films, µl•g^-1): 0.2
• Volumetric coefficient of expansion (DMA), 500 µm films
  • in the glassy region (x10^-6), <100°C^-1
  • in the rubbery region (x10^-6), 450°C^-1
• Refractive Index: 1.537
• Aging after 8 weeks Thermal weight change,
  • 3% at 95°C
  • 3% at 125°C

Cured Coating Characteristics (Tested at <1% R.H.)

• Glass Transition Range (DMA), 29°C at E’ _{1000 MPa} 
• Glass Transition Range (DMA), 51°C at E’ _{100 MPa}

Shelf Life: 18 months from the date of manufacture