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UV-Curing Optical Adhesives

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UV-Curing Optical Adhesives


  • Low Shrinkage and Low Stress
  • Strong Glass-Metal, Glass-Glass, and Glass-Plastic Bonds
  • Recommended UV Curing Intensity >2 mW/cm2 @ 365 nm
  • Dispenser Bottle Contains 1 oz (NOA Products) or 100 g (NBA107) of Adhesive

Norland Optic Adhesives are clear, one part adhesives that contain no solvents. When exposed to UV light, they gel in seconds and cure fully in minutes to give a tough resilient bond. Each of the six formulas listed below has been optimized to provide excellent bonding for specific applications. To cure these optical adhesives, they must be exposed to UV light. Thorlabs offers a UV curing systemthat provides an intensity of 600 mW/cm2.

Item #Adhesion Item Description
(Only Available in K6-NOA)
NOA60 typically has three uses: as a mounting cement for lenses, for the assembly of doublets or prisms, or for mounting components between two pieces of glass or plastic. Due to its excellent insulating properties, NOA60 can also be used as a protective overcoat on electrical components. The cured polymer has an refractive index of 1.56
Please note that the NOA60 is only available in the K6-NOA.
NOA61 is designed to give the best possible bond to glass surfaces and may be polished after curing. It meets Federal Specification MIL-A-3920 for optical adhesives and is approved for use on all government contracts specifying such adhesives. This adhesive has excellent adhesion to metal, fiberglass and glass-filled plastics. The refractive index of the cured polymer typically has a value of 1.56.
NOA63 can be used for bonding achromats, prisms and all other precision compound optics. The characteristics of this adhesive are its low fluorescence and its excellent transmission in the UV range. This adhesive is also suitable for bonding glass to metal. The adhesive cures well in thick sections and has low shrinkage and a slight resiliency to minimize strain. The refractive index of the cured polymer typically has a value of 1.56.
NOA65 when cured is a very flexible adhesive and minimizes strain. It is suitable where the adhesive cross section would be relatively thick. It has enough elasticity to minimize strain even when materials with different coefficients of expansion are bonded. It is used for potting of lenses in metal mounts and bonding plastic to glass. It is also a blocking cement for temporary mounting on polishing blocks. The refractive index of the cured polymer is 1.52.
NOA68 is a flexible adhesive designed to give improved adhesion to many plastics such as acrylic, polycarbonate and CAB. Suggested uses for NOA68 include bonding compound plastic lenses, laminating polarized film between glass or plastic, mounting lenses in metal or plastic mounts and bonding cover glasses onto plastic optics. The refractive index of the cured polymer typically has a value of 1.54.
NOA81 is an extremely fast curing adhesive. NOA81 has similar qualities to the NOA61, yet it can cure 3 to 5 times faster. However, curing times are dependent on the UV light source. Not only is it a faster curing adhesive, it is also tougher and stronger. NOA81 is recommended for applications that require extra toughness or speed in curing. The refractive index of the cured polymer typically has a value of 1.56. Like NOA61, it may also be polished.
K6-NOAK6-NOA kit includes all six UV curable optical adhesives above together with application data on each of the adhesives. The kit does not include the NBA107 block adhesive for temporary bonding of glass to metal.
NBA107NBA107 is a single component, UV curable adhesive used to temporarily bond optical components to metal polishing fixtures. The adhesive cures by exposure to UV light, thus eliminating the heat induced strain typically of hot pitch mounting methods. Deblocking, or removal of the optic is accomplished by immersing the bonded optic in warm (80 °C) water. The refractive index of the cured polymer typically has a value of 1.51.

Please click hereto view the German version of the Material Safety Data Sheet (MSDS) for this item.

Common Specifications

  • Cure: UV
  • Color: Clear
  • Coefficient of Thermal Expansion at Room Temperature: 220 x 10-6 in/in-°C
Item #Recommended UsesAdhesionViscosity @ 25 °CnaTensile StrengthShore D
NOA60cTough general purpose adhesive with
excellent insulating properties
GoodGoodFair300 CPS1.562,800 psi811 ± 0.07 oz
(28 ± 2 g)
NOA61Preferred optical adhesive, meets MIL-A-3920,
low shrinkage and resiliency
ExcellentExcellentFair300 CPS1.563,000 psi851 ± 0.07 oz
(28 ± 2 g)
NOA63Bond components by curing a hard resilient,
thick bead along an edge
GoodGoodFair2,000 CPS1.565,000 psi901 ± 0.07 oz
(28 ± 2 g)
NOA65Flexible adhesive suitable for low strain
applications and cold blocking
GoodGoodFair1,200 CPS1.521,500 psi501 ± 0.07 oz
(28 ± 2 g)
NOA68Flexible bond, ideal for plastics such as
polycarbonate, CAB and acrylic
ExcellentGoodGood to
5,000 CPS1.542,500 psi601 ± 0.07 oz
(28 ± 2 g)
NOA81Fast curing adhesive for tacking, a hard
resilient bond
ExcellentExcellentFair300 CPS1.564,000 psi901 ± 0.07 oz
(28 ± 2 g)
NBA107Temporary bonding of optics to metalFairExcellentFair-1.51--3.5 oz
(100 g)

a Index of Refraction, n
b Net Weight is the intrinsic weight of the product itself, not including the weight of the packaging or other materials.
c The NOA60 is only available in K6-NOA

Optical Properties

Using the Cauchy Equation below one can calculate the refractive index (n) at a specific wavelength (λ) for the NOA and NBA Series optical adhesives.

Cauchy's Equation

Where n25 °C = Refractive Index at 25 °C for a specific wavelength (nm), and A, B and C are constants determined by the material.
For the NOA61, NOA63 and NOA81 adhesives:
A = 1.5375
B = 8290.45
C = -2.11046 x 108

For the NOA65 and NBA107 adhesives:
A = 1.50631
B = 5435.62
C = 2.77798 x 107

Note: We are currently gathering more information on the optical properties of the NOA series adhesives and will post it as soon as it is available.

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Posted Comments:
Poster: jlow
Posted Date: 2013-12-04 01:40:23.0
Response from Jeremy at Thorlabs: You can find the CTE for NOA61 at https://www.norlandprod.com/adhesives/noa61pg2.html.
Poster: guguoqiang2009
Posted Date: 2013-11-28 19:40:28.573
Dear technical engineer, I want to know the thermal expansion coefficient of NOA 61.
Poster: jlow
Posted Date: 2013-06-04 10:22:00.0
Response from Jeremy at Thorlabs: You can find the datasheet at http://www.thorlabs.com/Thorcat/0900/NOA61-SpecSheet.pdf. The CS2010 curing system should have come with a German power cable for you. I will get in contact with you directly to send you a German power cable.
Poster: jlow
Posted Date: 2013-06-04 10:20:00.0
Response from Jeremy at Thorlabs: The NOA61 epoxy must be cured by UV-light.
Poster: marcus.nowatzki
Posted Date: 2013-06-03 15:01:45.65
I have a question to the product NOA61: The adhesive hardered only with the UV light or also without the uv-light but very slower? Thank you for helping.
Poster: marcus.nowatzki
Posted Date: 2013-06-03 14:53:33.467
1st: I need technical datasheed for adhesive NOA61. Where can i get that. 2nd: The UV Curing system has only a US-power cable, maybe it was better to put an German power cable in the box, when it was delivered in Germany.
Poster: jlow
Posted Date: 2012-10-24 13:41:00.0
Response from Jeremy at Thorlabs: The typical thickness for the adhesive is on the micron level, from 50-200µm.
Poster: ali.eichenberger
Posted Date: 2012-10-24 08:20:32.893
I plan to use NOA61 or NOA81 to bound a titanium piece on a glass rod (4 mm diam). Is there a typical thikness of glue I need to use? or thiner is better?
Poster: Thorlabs
Posted Date: 2010-12-02 09:55:13.0
Response from Javier at Thorlabs to tang.ep90g: we do not carry the NOA68T adhesive, but me may be able to offer it as a special item for you. I will contact you directly to start the quotation process.
Poster: tang.ep90g
Posted Date: 2010-12-02 15:47:32.0
Do you have NOA68T which is the same series of NOA68?
Poster: Thorlabs
Posted Date: 2010-11-08 12:33:22.0
Response from Javier at Thorlabs to Johannes: We would suggest using the NOA81 or NOA61 if the assembly needs to be polished after the curing process. These cure to the hardest surfaces. I will contact you directly to discuss your requirements regarding temperature dispersion.
Poster: johannes.trapp
Posted Date: 2010-11-08 14:49:45.0
Do you have information about the temperature dispersion of the adhesives? And which ones can be polished after curing?
Poster: john.arkwright
Posted Date: 2010-09-28 07:50:01.0
Hi there Do any of your Norlond optical adhesives, and NOA65 in particular, have approval for medical applications? Thanks John Arkwright
Poster: apalmentieri
Posted Date: 2010-01-05 12:04:14.0
A response from Adam at Thorlabs: In response to my earlier post, we have updated the website with an optical properties tab that includes the Cauchy Equation with Cauchy coefficients.
Poster: apalmentieri
Posted Date: 2010-01-04 09:02:39.0
A response from Adam at Thorlabs: We currently only have dispersion data for the NOA65. The refractive index of NOA65 is 1.5487(365nm), 1.5249(546nm), 1.52005(632.8nm), 1.51299(905nm), and 1.51112(1064.8nm). I am gathering data on the other epoxies and will post more information as soon as we have it. I will also work with our technical marketing team to get this data on the website.
Posted Date: 2010-01-03 13:31:46.0
It would be nice to have data on the index of refraction as a function of wavelength, can you please post the Sellmeier coefficients for these epoxies. If the coefficients are not avialable please provide a few data points (index & wavelength) from which we can estimate the optical disperson.
Poster: jens
Posted Date: 2009-05-15 15:09:20.0
A response from Jens at Thorlabs: The refractive index for the cured NOA61, NOA63, NOA81 polymer , is 1.56, NOA65 is 1.524, NOA68 is 1.54, NBA107 is 1.51. These are typical values as provided by Norland Products Inc. If you need additional data over a wavelenght range please let me know. Thanks
Poster: jeffrey.owen.white
Posted Date: 2009-05-15 14:49:52.0
What is the index of refraction of the various Norland adhesives?
Poster: technicalmarketing
Posted Date: 2007-10-24 11:33:01.0
In response to the last post, we have double checked and yes, the bottle has a net weight of 1 oz., so there is 28 g of adhesive in each bottle.
Poster: jschumacher
Posted Date: 2007-10-24 10:39:32.0
How much adhesive is in each bottle? It is a 1 ounce bottle but does it also include 28gram of adhesive?
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NOA61 Support Documentation
NOA61 MIL-A-3920 Optical Adhesive with Low Shrinkage & Resiliency, 1 oz.
NOA63 Support Documentation
NOA63 Optical Adhesive for Bonding of Glass to Glass, 1 oz.
NOA65 Support Documentation
NOA65 Optical Adhesive Suitable For Low Strain Application & Cold Blocking, 1 oz.
NOA68 Support Documentation
NOA68 Optical Adhesive for Bonding Glass to Plastic, 1 oz.
NOA81 Support Documentation
NOA81 Fast Curing Optical Adhesive, 1 oz.
K6-NOA Support Documentation
K6-NOA Adhesive Kit (Contains All 6 of the NOA UV Curable Adhesives)
NBA107 Support Documentation
NBA107 Block Optical Adhesives for Temporary Bonding
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