Optical Adhesives - Optically Clear Coatings, Adhesives, Encapsulants, and Impregnants

Master Bond's optically clear polymer compounds are widely used for coating, bonding, encapsulating and impregnating a wide range of organic and inorganic substrates. These compositions include specially formulated epoxy, urethane, silicone, cyanoacrylate and polyester resin based materials. A variety of cure methods are available including catalytic cures at ambient or elevated temperatures, cures upon exposure to UV or visible light, high energy radiation cures, and moisture cures.

Master Bond offers optically transparent compounds with service temperatures ranging from as high as 600°F (300°C) to as low as cryogenic temperatures (4K). Spectral transmission ranges from 300 nanometers to in excess of 2000 nanometers are available. Typical optical transmission measurements in the most widely used 300-400 nanometer range are greater than 90%. These new optically transmissive compounds exhibit excellent long term stability and exceptional resistance to unfavorable environment exposures including moisture.

  • High reliability
  • Abrasion resistance
  • Reworkability
  • Low stress
  • Spin coatable
  • Low outgassing
  • Dimensional stability
  • High/low (cryogenic) temperature serviceability
  • Resists vibration, shock, impact and thermal cycling
  • Superior electrical insulation properties
  • Outstanding chemical and water resistance
  • Easy dispensing in convenient applicators
  • High bond strength to metals, ceramics, glass, rubbers and most plastics

Our Most Popular Spectral Transmittance Systems

Master Bond's popular spectral transmittance systems are described in the table below.

Product Description
EP30-1 This low viscosity, slightly toughened system is used for bonding fibers to connectors. Optically clear, it transmits at over 92% from 300nm to 2000 nm.
UV15-7 Excellent UV cured adhesive, sealant, and coating with a refractive index of 1.55. Exhibits spectral transmittance of over 90% in the 300 nm to 1500 nm range. 100% reactive. Contains no solvents. High bond strength to similar and dissimilar substrates.
EP29LPSP A cryogenic, two part, low outgassing epoxy with service from 4K to 250ºF and a refractive index of 1.55. Exhibits outstanding spectral transmittance of over 97% from 300 nm to 2000 nm. Long working life. Superior electrical insulation properties. Withstands cryogenic shocks.

Master Bond Spectral Transmittance Systems Are Used in a Wide Range of Applications

  • Bonding and small volume potting of plastic or glass optical fibers, lenses, prisms, LED displays, and other optical components
  • As a conformal coating for electronic components
  • Bonding fibers to connectors
  • Glass fiber potting
  • LCD optical lamination
  • Sealing of glass plates
  • Flip chip underfill
  • Glob top encapsulation
  • Wafer level packaging
  • Gyroscope coils
  • Photo diode arrays
  • Fiber optic mounting
  • Bonding glass cover slip over V-groove
  • LED encapsulation
  • MEMS fabrication of accelerometers
  • Fabrication of MEMS devices
  • For providing near hermetic seals in sensor devices
  • Catheter device production (stents, guide wires, etc.)
  • As a dielectric layer in the fabrication of capacitors
  • For laminating PZT ferroelectrics found in ultrasound or ink-jetting devices
  • Endoscopes
  • Sensor devices
  • Fiber optic coupling and splicing
  • Laser diodes
  • General potting and protection over FR4, flex, or ceramic PCBs
  • Fiber optic bundling
  • Down-hole petrochemical fiber optic sensors
  • MEMS fabrication of pressure sensors
  • Hybrid packaged IR sensors
  • Potting and protection of scintillator crystals
  • CT detector packaging
  • Fiber optic terminations
  • Micro-molding lenses for LCD projection
  • For applications requiring efficient light channeling from fiber-to-lens and fiber-to-diodes
  • As a glass-glass adhesive for CCD/CMOS devices
  • Waveguide bonding
  • Refractive index matching
  • Fiber optic pigtailing
  • As a perimeter/main seal for LCDs

Packaged the Way You Need It

We offer a wide array of packaging options to speed productivity, minimize waste and save energy including…

  • Quantities from grams to gallons
  • Cans, bottles and jars
  • Cartridges for manual and pneumatic guns
  • Premixed and frozen syringes
  • Bipaks for field service kits

Newly Developed Optically Clear Adhesives


  • One part, UV curable, nanosilica filled epoxy
  • Exceptional abrasion and chemical resistance
  • Low coefficient of thermal expansion
  • Superb optical clarity
  • Exhibits a fast cure at ambient temperature upon UV light exposure


  • Toughened UV curable optically clear compound
  • Non-yellowing
  • Long term durability, flexibility, and thermal shock resistance
  • High bond strength to similar and dissimilar substrates


  • Low viscosity, highly flexible, two component epoxy system
  • Room temperature curing
  • Optically clear
  • Excellent impact resistance and bonds well to similar and dissimiliar substrates
  • Forgiving one to one mix ratio
  • Low exotherm


  • Fast curing, two component, low viscosity optically clear epoxy system
  • Resistant to boiling water blushing and exudation
  • Exceptional electrical insulation properties

Epoxy and UV Cure Systems for Optical, Electro-Optical, Fiber Optic, and Laser Products by Master Bond

The Master Bond product line includes both one and two component epoxy resin compounds and one component UV curable compositions. The epoxy resin compounds are all specially formulated to maximize resistance to liquid water, water vapor and other adverse environments. Some of the outstanding features of the optical systems offered by Master Bond are excellent light transmission characteristics and superior non-yellowing properties; all along with a wide range of systems where the index of refraction ranges from a relatively low 1.43 up to 1.61. It should be noted that the ultraviolet compositions cure tack free in the presence of air. All Master Bond products have been carefully processed to exclude such potentially objectionable contaminants as chlorine and other halogens as well as sodium and related elements. They provide innovative solutions to the many processing problems of these industries and virtually eliminate quality control difficulties caused by corrosion and other environmentally induced conditions.

Typical applications range from bonding and potting fiber-optic cables, connectors and terminations, and upgrading the vibration and shock resistance of electro-optic assemblies. Other applications include cementing and coating optical parts, potting LED devices, optical replications, bonding ferrules and connectors, and coating or encapsulating a wide variety of electro-optic and laser components.

This information has been sourced, reviewed and adapted from materials provided by Master Bond Inc.

For more information on this source, please visit Master Bond Inc.


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