Adhesives, Dispensing & UV Cure Systems

Quick Answer

UV-cure adhesives cure on-demand when exposed to UV or visible light — no mixing, no pot life, and dramatically faster throughput than two-part systems. For structural bonding: cyanoacrylates (instant adhesives) for plastics, rubber, and metals with minimal fixturing time; epoxies for the highest strength and chemical resistance; anaerobic adhesives for threadlocking and retaining metal assemblies. The most common adhesive selection mistake is using a threadlocker as a retaining compound (or vice versa) — both are anaerobics but formulated for different gap sizes and bond geometries. For UV adhesives, always verify shadow cure capability when bonding assemblies where light cannot reach all bonded surfaces.

In this hub: UV-cure adhesive selection, structural adhesive types, conformal coatings vs. encapsulants, dispensing systems, storage and shelf life, FAQ, and brand resources.

Precision bonding, sealing, and coating are critical steps in electronics assembly, medical device manufacturing, and industrial production. MTE Solutions carries professional-grade UV-cure adhesives, structural adhesives, light-cure systems, dispensing equipment, and precision applicators from Dymax, Permabond, and MG Chemicals.

Shop All Adhesives at MTE Solutions →

How Do You Select the Right UV-Cure Adhesive for Your Application?

UV-cure adhesives cure on-demand when exposed to UV or visible light — eliminating mixing, enabling precise dispensing, and dramatically accelerating production throughput. Selection requires matching the adhesive’s cure wavelength to your light-cure system, verifying substrate compatibility, and addressing shadow cure requirements for areas the light cannot reach. For medical device applications, biocompatible and USP Class VI grades are required.

  • Cure wavelength matching to your light-cure system
  • Substrate compatibility (glass, plastics, metals)
  • Shadow cure and secondary cure mechanisms
  • Biocompatible and USP Class VI grades for medical devices
  • Dispensing equipment and applicator selection

Related Resources:

Which Structural Adhesive Should You Use — Cyanoacrylate, Epoxy, or Anaerobic?

Structural adhesive selection depends on the substrates being bonded, the required bond strength, environmental exposure, and whether the bond needs to be permanent or serviceable. Cyanoacrylates provide fast, high-strength bonds on plastics, rubber, and metals with minimal fixturing time. Epoxies offer the highest strength and chemical resistance for demanding structural applications. Anaerobic adhesives cure in the absence of oxygen — ideal for threadlocking, retaining, and gasketing metal assemblies.

  • Cyanoacrylates (instant adhesives) — plastics, rubber, and metals
  • Epoxies — high-strength, chemical-resistant structural bonds
  • Anaerobic threadlockers, retaining compounds, and gasketing
  • Modified acrylics — flexible, impact-resistant bonds on dissimilar materials
  • Permanent vs. removable threadlocking grades

Related Resources:

How Do You Choose Between Conformal Coatings and Encapsulants for PCB Protection?

Conformal coatings and encapsulants both protect electronics from environmental stress, but they serve different purposes. Conformal coatings are thin films that protect the board surface while leaving components accessible for inspection and rework. Encapsulants and potting compounds completely encase the assembly for maximum protection but make rework impossible. For most electronics applications, conformal coating is the right choice; encapsulation is reserved for harsh environments where maximum protection outweighs serviceability requirements.

  • Acrylic, silicone, urethane, and epoxy conformal coating chemistries
  • UV-cure conformal coatings for rapid production throughput
  • Conformal coating tape for masking during application
  • IPC-CC-830 compliance and testing

Related Resources:

How Do You Select the Right Dispensing System for Adhesives and Coatings?

Precision dispensing equipment ensures accurate, repeatable application of adhesives, coatings, and solder paste — reducing waste, improving consistency, and protecting product integrity in cleanroom and ESD-sensitive environments. The right nozzle tip geometry determines bead size, shape, and placement accuracy. For UV-cure adhesives, the dispensing system must shield the adhesive from ambient light during dispensing to prevent premature cure in the nozzle.

Related Resource:

How Should You Store Adhesives to Maximize Shelf Life and Performance?

Adhesive storage requirements vary significantly by chemistry — and improper storage is one of the most common causes of adhesive performance failures. Cyanoacrylates must be stored in a cool, dry environment away from moisture. UV-cure adhesives must be stored away from UV light sources. Always use adhesives on a first-in, first-out basis and check the expiration date before use.

  • Cyanoacrylates — cool, dry, away from moisture; 12–24 months unopened
  • UV-cure adhesives — away from UV light, at manufacturer’s specified temperature
  • Epoxies and anaerobics — more forgiving but degrade with temperature extremes
  • Opened containers — use within 30–90 days for cyanoacrylates

Related Resource:

Frequently Asked Questions About Adhesives, Dispensing & UV Cure Systems

What is the difference between UV-cure adhesives and traditional two-part adhesives?

UV-cure adhesives are single-component systems that cure instantly when exposed to UV or visible light — no mixing, no pot life concerns, and no waiting for moisture or heat cure. They offer precise on-demand cure control, fast production throughput, and excellent bond strength on glass, plastics, and metals. Two-part adhesives (epoxies, acrylics) require mixing of resin and hardener, have a limited pot life after mixing, and cure over minutes to hours. Two-part systems are preferred when UV light cannot reach all bonded surfaces or when the substrate is opaque.

What is a shadow cure and why does it matter for UV adhesives?

Shadow cure refers to the ability of a UV adhesive to cure in areas that UV light cannot directly reach — such as under opaque components, inside joints, or in deep cavities. Most UV adhesives require direct light exposure to cure; without a shadow cure mechanism, uncured adhesive in shadow areas remains liquid and can cause bond failures or contamination. Shadow cure is achieved through secondary cure mechanisms: moisture cure, heat cure, or anaerobic cure that activates in the absence of oxygen.

What is the difference between a threadlocker and a retaining compound?

Both are anaerobic adhesives that cure in the absence of oxygen between metal surfaces, but they are formulated for different applications. Threadlockers are applied to threaded fasteners to prevent loosening from vibration — available in removable (blue), permanent (red), and high-strength grades. Retaining compounds are formulated for cylindrical assemblies (bearings, bushings, shafts in housings) where they fill the gap between mating parts and create a high-strength bond that resists rotation and axial movement. Using a threadlocker as a retaining compound results in significantly lower bond strength.

How do you choose between a permanent and removable threadlocker?

Removable threadlockers (typically blue, medium strength) allow fasteners to be removed with standard hand tools for maintenance and service. Permanent threadlockers (typically red, high strength) require heat (typically 250°C+) or significant mechanical force to break the bond — used where fasteners must never loosen under any circumstances. Choose removable grade for any fastener that may need to be serviced; choose permanent grade only for fasteners that are intended to be permanent or where vibration loads exceed the capacity of removable grades.

Can cyanoacrylate adhesives bond all plastics?

No — cyanoacrylates bond well to most plastics but have poor adhesion to polyethylene (PE), polypropylene (PP), PTFE (Teflon), and other low-surface-energy plastics without surface treatment. These plastics require plasma treatment, chemical primers, or a different adhesive chemistry to achieve adequate bond strength. Always test on the specific plastic substrate before committing to production use — plastic formulations vary widely and surface energy can differ even within the same polymer family.

What is the shelf life of cyanoacrylate adhesives?

Unopened cyanoacrylate adhesives typically have a shelf life of 12–24 months when stored at the manufacturer’s recommended temperature (usually 35°F–50°F / 2°C–10°C for maximum shelf life, or up to 12 months at room temperature). Once opened, cyanoacrylates should be used within 30–90 days — moisture from the air begins to cure the adhesive in the container. Always replace the cap immediately after use and store in a cool dry location.

What light-cure systems are available for UV adhesives?

UV light-cure systems are available in three main formats: spot cure systems deliver a focused beam of UV light to a specific point — ideal for precise, localized curing of small bond areas. Flood cure systems illuminate a broad area simultaneously — used for curing multiple parts or larger bond areas at once. Conveyor cure systems move parts under a UV lamp at a controlled speed for high-volume inline production. LED-based UV systems are increasingly preferred over mercury arc lamps for their longer lamp life, lower heat output, and instant on/off capability.

What adhesive brands does MTE Solutions carry?

MTE Solutions carries adhesives and dispensing systems from Dymax, Permabond, and MG Chemicals. Dymax specializes in UV-cure adhesives, light-cure equipment, and dispensing systems for electronics, medical device, and industrial assembly. Permabond offers a comprehensive range of cyanoacrylates, epoxies, anaerobic threadlockers, and UV adhesives for engineering applications. MG Chemicals provides epoxies, silicones, and conductive compounds for electronics manufacturing and repair.

Shop by Brand

Need help selecting the right adhesive or dispensing system? Browse our complete resource library or contact our team for personalized recommendations.