UV Adhesives

SPECTRA SA 50

    • Intended Wavelength: 355 nm

    • Color: Grey

    • General prototyping and model making

    • Industrial design CMF prototypes

    • Prop and set production

    • Low viscosity and fast build times

    • Highly dimensionally accurate

    • Capable of thin walls and fine features

SPECTRA SA 115

    • Intended Wavelength: 355 nm

    • Color: Grey

    • General prototyping and model making

    • Industrial design CMF prototypes

    • Prop and set production

    • Low viscosity and fast build times

    • Highly dimensionally accurate

    • Capable of thin walls and fine features

Photoinitiators

Photoinitiators are chemical compounds used to generate reaction intermediates after the absorption of light. In the presence of specific small molecules (liquid monomers) these intermediates are responsible for the production of solids from liquids, (i.e. polymerization).

  • Type I photoinitiators produce reactive intermediates directly after light absorption

  • Type II photoinitiators require a second compound, a so-called co-initiator, to produce such intermediates

H-Nu photoinitiators are capable of curing (hardening) resins of two general kinds:

  • Acrylates and methacrylates, cured by free-radical processes

  • Epoxides, cured by cationic processes

Spectra Photopolymers offers a patented line of unique Type II UV/visible light photoinitiators, covering the panchromatic UVA, visible and IR spectrum (H-Nu 470).

Photoinitiators Spectrum

  • Acrylate and methacrylate polymerization (free-radical) initiated by H-Nu 470  photoinitiator generally requires co-initiators such as amine or Borate V as well as iodonium salts.

  • Epoxides (cationic) polymerization generally is carried out in combination with iodonium salt co-initiators (H-Nu 470 and cationic photoiniators). Further improvement in polymerization efficiency is possible by the use of proprietary accelerators.
    H-Nu 470 cationic photoinitiators have proved to work exceptionally well with SU-8 photoresins, making possible visible light lithography.

Benefits of the visible light H-Nu photoinitiator series in photopolymerization processes

  • High Absorptivity – low concentrations needed

  • Speed of Cure – moderate to fast (depending on formulation)

  • Better light utilization and reduced levels of UV photoinitiators normally required – by adding H-Nu photoinitiators to an existing UV formulation

  • H-Nu photoinitiators can provide a thick cured coating after one pass – saving time and energy

  • Capable of significant depth of cure – > 1 inch or more

  • Enhanced adhesion/depth of cure of pigmented formulations

  • Cure through UV opaque, pigmented, colored substrates (i.e. red plastic).

  • Photoinitiator bleaching – pale or no residual color

  • Bleaching/Color change indicator of cure (exposure) with visible light (UV)

H-Nu Liquid Blend Photoinitiators

  • Liquid Blend Photoinitiators are easy to incorporate liquids, minimizing downtime from solubility issues.

  • Liquid blends targeted to match and optimize surface cure with UVA LED light sources (H-Nu 470LT5 )

  • H-Nu photoinitiators liquid blends to provide for ease of addition and incorporation as well as the curing range extension to cover UV/visible range (H-Nu 400IL , H-Nu 470IL, H-Nu 470LT5 )

  • Miscible with most aqueous acrylate systems and hydrogels (H-Nu 405IL) 

  • Improved efficiency of UV and visible light cure (photosensitization) of iodonium salts to cure epoxides (e.g. Cycloaliphatic, Bisphenol A, Novolacs, and others) through the use of proprietary liquid blends and accelerators (H-Nu C390 and H-Nu C390HI )

  • Antimony-free (H-Nu 390) and both antimony- and benzene-free (H-Nu 390HI) liquid blend cationic photoinitiators

SDS sheets for all H-Nu photoinitiators can be provided upon request.

At Spectra Photopolymers, we are pleased to offer photoinitiator samples as testing kits, to include all necessary co-initiators and co-solvents. The purpose of providing a kit is that you can quickly test your concept to see if our materials may be working for you. To request one of our photoinitiator kits, contact us below:

Color-On-Demand Additives

Spectra Photopolymers offers a number of fully formulated additive products to provide photoinitiated color change for a variety of applications. Further customization of the existing products for the needs of a particular application will be performed.

Adhesive Cure Verification

Both color formation and bleach

Image: Unexposed (blue) and Exposed (bleached) to UVA light

UV Coating Additives

  • A simple to use and definitive indicator to provide for certainty of exposure

  • Multiple colors available for both 100% solids UV and waterbased coatings

  • NEW, Amine-FREE color change additive for both 100% solids and waterbased formulations (Red-to-clear)

  • NEW Violet-to-Clear, Amine-FREE color change additive for waterbased formulations

Image: Unexposed (blue) and Exposed (bleached) to UVA light

SPECTRA SC-CL355

Clear UV Light Curable, ABS-like General Purpose Resin

Color-On-Demand Irreversible Formulated Products

Color Change Printed Products

High Dose UV Radiachromic Films

To distinguish large UV doses in the range of 3,000 – 10,000 mJ/cm2

Radiachromic Films

Thin Film Color Change UV Dosimeters

High Dose UV Radiachromic Films

  • UV exposure dose monitoring (narrow web, difficult to access, partially covered and 3-D applications)

  • Good linearity color change vs accumulated exposure dose, large dynamic range of exposure doses – several or single sensitivity zones, broad spectral responsivity (suitable for undoped and various doped mercury sources)
    Comparison of multiple sources, quality control

  • An independent evaluation of these products has been performed and the results of the study have been published in trade literature

LED Radiachromic Films

To enable LED UV-Vis light radiachromic measurements with better sensitivity in low dose range. Working range from 365nm – 405nm.

High Dose UV Radiachromic Films

To distinguish large UV doses in the range of 3,000 – 10,000 mJ/cm2

Other Printed Color Change Products

UVC Labels

Verification of sterilization

  • UV exposure dose monitoring, specifically targeted for short wavelength, 254nm, germicidal bulbs

EB FastCheck Strips

Electron beam (EB) dosimeter

  • Electron beam (EB)/gamma-ray exposure dose monitoring for varying accelerated voltage

  • Depth of penetration profiling

  • Comparison of multiple sources, quality control

  • Radiation sterilization indicator

EB FastCheck Strips

A series of tunable sun monitoring products, from minutes to several hours to days

  • Measure accumulated sun dose exposure over a period of a day in distinct increments

  • Longer sun exposure products (measurement over a period of a month) are possible

RoomLight

Measure accumulated room light dose exposure over a period of days in distinct increments