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The Engineering Toolbar
The Ultimate Resource for Engineering and Technical Research. (Learn More) |
Optical Bonding Materials
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From Dontech Incorporated
Because most types of glass have a refractive index of 1.5, most adhesives used for optical bonding have a similar refractive index. Depending on the application, silicone, epoxy, acrylated urethane or PSA may offer the optimized mechanical and thermal properties. Silicones are commonly used in optical bonding because they have high transparency, good thermal range and can be reworked if a problem occurs (such as debris entrapment) during the bonding process. The drawback of silicones is that they are soft material and can fail at low temperatures or high altitudes. Consequently, they may not be suitable for applications where high mechanical strength and stability are required. Products & Services
Spectral filters are used to selectively transmit light according to its wavelength. They are not to be mistaken with color filters, which can be differentiated by an associated schott glass number.
Learn more about Spectral Filters
Optical windows are used to isolate different physical environments while allowing light to pass relatively unimpeded.
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Learn more about Optical Windows
Optical diffusers scatter incident light, thereby reducing the sensitivity of a detection system to slight positional or angle changes in an incoming beam.
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Learn more about Optical Diffusers
Neutral density filters are designed to reduce transmission evenly across a portion of the spectrum. They are slightly sensitive to angles but they are much more forgiving than interference filters.
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Learn more about Neutral Density Filters
Optical bandpass filters are designed to transmit a specific waveband. They are composed of many thin layers of dielectric materials, which have differing refractive indices to produce constructive and destructive interference in the transmitted light.
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Learn more about Optical Bandpass Filters
Product Announcements
Topics of Interest
Elastomeric silicone resins have low shear properties but excellent peel strength and heat
resistance (over 250°C). However, they have relatively high cost. Silicone adhesives are
available as...
(Read More)
Like epoxies, polyurethane reactive adhesives include systems that are available as 100
percent solids or solvent-based and one- or two-part formulations. These adhesives can cure
at room or...
(Read More)
16.8 GLASS AND CERAMICS
Glass and ceramic substrates are generally high-surface-energy materials, and most adhesives wet them readily. One problem in bonding optically clear glass is to select an...
(Read More)
Conventional hermetic sealing methods of the past - epoxies, solder seals and mechanical seals - cannot fulfill the microwave electronics requirement of 100% protection against moisture. Many...
(Read More)
2.4 POLYSTYRENES
Except where high temperatures are involved, polystyrenes may be used for some electronic applications. They have very low dielectric constants and power factors (Table 2.5),...
(Read More)
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