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Light-Activated Instant-Bond Adhesives



For easy positioning, these adhesives begin to harden only when exposed to light.
Thick liquids fill large gaps and won't drip on vertical surfaces. Thin liquids flow to fill small gaps between close-fitting parts.
352 can also be cured with an activator (sold separately).
Use adhesives in syringes with a dispensing gun with plunger (sold separately).
Container | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Max. Gap Size Filled | Begins to Harden | Reaches Full Strength | Light Intensity Requirements to Reach Full Strength | Cure Type | Consistency (Viscosity) | Temp. Range, °F | Color | For Joining | Each | |
Loctite® Adhesives | |||||||||||||
349 | 1.69 | Bottle | __ | 5 sec. | 30 sec. | 8 sec. @ 10 mW/cm2 | UV Light | Thick Liquid (9,750 cP) | -65° to 260° | Light Yellow | Glass, Metal | 00000000 | 000000 |
352 | 1.69 | Bottle | __ | 10 sec. | 60 sec. | 12 sec. @ 6 mW/cm2 | Activator, UV Light | Thick Liquid (19,500 cP) | -65° to 270° | Amber | Glass, Metal, Plastic, Rubber | 00000000 | 00000 |
3104 | 0.84 | Syringe | __ | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thin Liquid (150 cP) | -65° to 300° | Light Yellow | Glass, Metal, Plastic, Rubber | 00000000 | 00000 |
3105 | 0.84 | Syringe | __ | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thin Liquid (300 cP) | -65° to 300° | Light Yellow | Glass, Metal, Plastic, Rubber | 00000000 | 00000 |
3105 | 33.8 | Bottle | __ | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thin Liquid (300 cP) | -65° to 300° | Light Yellow | Glass, Metal, Plastic, Rubber | 00000000 | 000000 |
3301 | 0.84 | Syringe | __ | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thin Liquid (150 cP) | -65° to 300° | Light Yellow | Glass, Metal, Plastic | 00000000 | 00000 |
3311 | 0.84 | Syringe | __ | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thin Liquid (300 cP) | -65° to 300° | Light Yellow | Glass, Metal, Plastic | 00000000 | 00000 |
3341 | 0.84 | Syringe | __ | 5 sec. | 30 sec. | 10 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thin Liquid (530 cP) | -65° to 300° | Light Yellow | Metal, Plastic | 00000000 | 00000 |
3556 | 0.84 | Syringe | __ | 5 sec. | 1 hrs. | 5 sec. @ 500 mW/cm2 | Visible Light | Thick Liquid (5,000 cP) | -65° to 300° | Light Yellow | Metal, Plastic | 0000000 | 000000 |
3922 | 0.84 | Syringe | __ | 10 sec. | 30 sec. | 10 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thin Liquid (300 cP) | -65° to 300° | Light Yellow | Glass, Metal, Plastic, Rubber | 00000000 | 00000 |
4311 | 1 | Bottle | 0.008" | 5 sec. | 24 hrs. | 10 sec. @ 30 mW/cm2 | UV Light, Visible Light | Thin Liquid (1,050 cP) | -65° to 200° | Green | Ceramic, Composites, Glass, Metal, Plastic, Rubber, Wood | 000000 | 00000 |
Flexible Light-Activated Instant-Bond Adhesives



These adhesives stay pliable for flexible bonds that resist cracking. For easy positioning, they begin to harden only when exposed to light.
1700A257 and 2454N1 fluoresce under UV light for easy inspection.
Use adhesives in syringes with a dispensing gun with plunger (sold separately).
Container | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Max. Gap Size Filled | Begins to Harden | Reaches Full Strength | Light Intensity Requirements to Reach Full Strength | Cure Type | Consistency (Viscosity) | Elongation | Temp. Range, °F | Color | For Joining | Each | |
Loctite® Adhesives | ||||||||||||||
3103 | 0.84 | Syringe | 0.02" | 5 sec. | 90 sec. | 18 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (11,250 cP) | 260% | -65° to 300° | Light Yellow | Glass, Metal, Plastic | 00000000 | 000000 |
3106 | 0.84 | Syringe | 0.02" | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (5,500 cP) | 250% | -65° to 300° | Light Yellow | Glass, Metal, Plastic, Rubber | 00000000 | 00000 |
3106 | 33.8 | Bottle | 0.02" | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (5,500 cP) | 250% | -65° to 300° | Light Yellow | Glass, Metal, Plastic, Rubber | 00000000 | 000000 |
3201 | 0.84 | Syringe | __ | 5 sec. | 90 sec. | 20 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (3,750 cP) | 265% | -65° to 300° | Light Yellow | Metal, Plastic | 0000000 | 00000 |
3211 | 0.84 | Syringe | __ | 5 sec. | 90 sec. | 18 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (11,250 cP) | 260% | -65° to 300° | Light Yellow | Glass, Metal, Plastic | 0000000 | 00000 |
3321 | 0.84 | Syringe | 0.02" | 5 sec. | 90 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (5,500 cP) | 250% | -65° to 300° | Light Yellow | Glass, Metal, Plastic, Rubber | 00000000 | 00000 |
3526 | 0.84 | Syringe | __ | 5 sec. | 30 sec. | 5 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (17,500 cP) | 185% | -65° to 300° | Light Yellow | Metal | 00000000 | 00000 |
3936 | 0.84 | Syringe | __ | 5 sec. | 30 sec. | 15 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (11,000 cP) | 300% | -65° to 300° | White | Metal | 00000000 | 00000 |
Adhesives | ||||||||||||||
__ | 1.69 | Bottle | 0.25" | 5 sec. | 30 min. | 5 sec. @ 100 mW/cm2 | UV Light | Thin Liquid (850 cP) | Not Rated | 45° to 80° | Clear | Ceramic, Composites, Glass, Metal, Plastic, Rubber | 000000 | 00000 |
Dispensing Gun with Plunger | 0000000 | Each | 000000 |
Optically Clear Light-Activated Instant-Bond Adhesives



Invisibly bond glass and metal—these adhesives dry clear. For easy positioning, they begin to harden only when exposed to ultraviolet light.
Container | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Size, fl. oz. | Type | Max. Gap Size Filled | Begins to Harden | Reaches Full Strength | Light Intensity Requirements to Reach Full Strength | Cure Type | Consistency (Viscosity) | Temp. Range, °F | For Joining | Each | |
0.84 | Syringe | 0.25" | 10 sec. | 24 hrs. | 20 seconds @ 100 mW/cm2 | UV Light | Thick Liquid (6,950 cP) | -65° to 250° | Glass, Metal | 000000 | 000000 |
1.69 | Bottle | 0.25" | 10 sec. | 24 hrs. | 20 seconds @ 100 mW/cm2 | UV Light | Thick Liquid (6,950 cP) | -65° to 250° | Glass, Metal | 000000 | 00000 |
33.8 | Bottle | 0.25" | 10 sec. | 24 hrs. | 20 seconds @ 100 mW/cm2 | UV Light | Thick Liquid (6,950 cP) | -65° to 250° | Glass, Metal | 000000 | 000000 |
Moisture-Resistant Light-Activated Instant-Bond Adhesives

Moisture, humidity, and immersion in water won't degrade the bond of these adhesives. For easy positioning, they begin to harden only when exposed to light. Use a dispensing gun with plunger (sold separately) to dispense adhesive.
Container | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Size, fl. oz. | Type | Begins to Harden | Reaches Full Strength | Light Intensity Requirements to Reach Full Strength | Cure Type | Consistency (Viscosity) | Temp. Range, °F | Color | For Joining | Each | |
Loctite® Adhesives | ||||||||||||
3494 | 0.84 | Syringe | 5 sec. | 30 sec. | 10 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (6,000 cP) | -65° to 300° | Clear | Glass, Metal | 00000000 | 000000 |
3525 | 0.84 | Syringe | 5 sec. | 30 sec. | 5 sec. @ 6 mW/cm2 | UV Light, Visible Light | Thick Liquid (15,250 cP) | -65° to 300° | Clear | Glass, Metal, Plastic, Rubber | 00000000 | 00000 |
Adhesives | ||||||||||||
__ | 0.84 | Syringe | 60 sec. | 60 sec. | 15 seconds @ 6 mW/cm 2 | UV Light | Thick Liquid (400 cP) | -65° to 350° | Amber | Glass, Magnets, Metal | 00000000 | 00000 |
Dispensing Gun with Plunger | 0000000 | Each | 000000 |
Heavy Duty Light-Activated Coatings for Electronics


Thinner than potting compounds, these coatings flow easily into small spaces between electrical components. They require an ultraviolet curing lamp to reach full strength. Use them to secure and insulate hardware on printed circuit boards.
Syringe coatings require a gun (sold separately) to dispense.
Dry Time | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. | Mfr. Model No. | Container Size, fl. oz. | Consistency | Touch, sec. | Overall | Hardness Rating | Dielectric Strength, V/mil | Temp. Range, °F | Light Intensity Requirements to Reach Full Strength | For Use On | Color | Each | |
Bottle Coatings | |||||||||||||
__ | __ | 1 4/5 | Thin Liquid | 10 | 60 sec. | Not Rated | 34,000 | -65° to 350° | 10 seconds @ 7 mW/cm 2 | Aluminum, Brass, Copper, Steel, Stainless Steel, Silver, Titanium, Fiberglass | Amber | 00000000 | 000000 |
Syringe Coatings | |||||||||||||
Loctite® | 3751 | 4/5 | Thin Liquid | 10 | 2 min. | Extra Hard | 730 | -65° to 270° | 10 seconds @ 100 mW/cm 2 | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Titanium, Plastic, Composites, Fiberglass | Yellow | 00000000 | 00000 |
Dispensing Guns for Syringes | 0000000 | Each | 000000 |
Heavy Duty High-Purity Light-Activated Coatings for Electronics

This coating is formulated for use in sensitive applications such as manufacturing semiconductors. Thinner than potting compounds, it flows easily into small spaces between electrical components. The coating begins to harden when exposed to UV light. Use it to secure and insulate hardware on printed circuit boards. It requires a gun (sold separately) to dispense.
Dry Time | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Container Size, fl. oz. | Consistency | Touch, sec. | Overall, hrs. | Dielectric Strength, V/mil | Temp. Range, °F | Light Intensity Requirements to Reach Full Strength | For Use On | Color | Each | |
Loctite® Coatings—Medium Soft | |||||||||||
5240 | 0.85 | Thick Liquid | 10 | 72 | 533.4 | -65° to 195° | 60 seconds per side @ 70 mW/cm2 | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Silver, Titanium, Fiberglass, Composites | Green | 0000000 | 000000 |
Dispensing Guns for Syringes | 0000000 | Each | 000000 |
Component-Concealing Coatings for Electronics
Hide proprietary information on electrical components while also protecting them from moisture, dust, and static. All it takes is a single thin layer of these black coatings. They’re often used to protect custom parts while prototyping. Place them under a UV curing lamp to fully harden them in just 5 seconds. Made of urethane, they resist chemicals and scratches and won’t crack in low temperatures. That means they’re great for harsh environments. These coatings meet UL 94 V-0 for flame retardance.
Also known as conformal coatings, they’re thinner than potting compounds, so they flow into the smallest contours to cover your parts completely. They also don’t require a potting box or other container. Dispense these coatings with a gun (sold separately).

Dry Time | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Container Size, fl. oz. | Consistency | Touch, sec. | Overall, sec. | Dielectric Strength, V/mil | Temp. Range, °F | Light Intensity Requirements to Reach Full Strength | Cure Type | Specifications Met | For Use On | Color | Each | |
1 | Thick Liquid | 5 | 5 | 1,200 | -40° to 300° | 5 seconds @ 50 mW/cm 2 | UV Light | UL 94 V-0 | Aluminum, Brass, Copper, Steel, Stainless Steel, Silver, Titanium, Fiberglass | Black | 0000000 | 000000 |
Dispensing Guns for Syringes | 0000000 | Each | 000000 |
Light-Activated Silicone Potting Compounds

These compounds dry quickly when exposed to UV light allowing you to handle the potted items sooner. Made of silicone, they’re softer and more flexible than epoxy or urethane compounds, so they’re better at protecting against shocks and vibration. They also withstand a wider range of temperatures, so they’re often used with electronics that heat and cool rapidly. These compounds are excellent electrical insulators, and they’ll shield your components from moisture and dust. However, they don’t hold up well to abrasion or chemicals. The tapered nozzle lets you apply them precisely.
Dry Time | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Container Size, fl. oz. | Consistency | Touch, sec. | Overall, hrs. | Light Intensity Requirements to Reach Full Strength | Cure Type | Dielectric Strength, V/mil | Thermal Conductivity | Temp. Range, °F | Specifications Met | For Use On | Color | Each | |
Loctite® Compounds—Soft | ||||||||||||||
5091 | 10 1/10 | Thick Liquid | 20 | 24 | 60 sec. per side @ 40 mW/cm2 | UV Light | 450 | Not Rated | -65° to 350° | UL Recognized Component | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Fiberglass, Composites, Plastic, Silver | White | 0000000 | 0000000 |
Light-Activated Urethane Potting Compounds

In just 20 seconds under a UV light, these urethane compounds form into a strong protective layer on electrical components. They withstand a wide range of temperatures and are good electrical insulators. They also stop chemicals, moisture, and dust from damaging your device. With excellent flexibility, they protect against vibration and impact. Since they also work as an adhesive, you can use them to bond and insulate components such as electrical connectors and thermal switches. No mixing required.
Dry Time | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Container Size, fl. oz. | Consistency | Touch, sec. | Overall, sec. | Light Intensity Requirements to Reach Full Strength | Cure Type | Hardness Rating | Dielectric Strength, V/mil | Thermal Conductivity | Temp. Range, °F | For Use On | Color | Each | |
1.69 | Thin Liquid | 20 | 20 | 20 sec. @ 100 mW/cm2 | UV Light | Extra Hard | 1,800 | Not Rated | -40° to 250° | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Polycarbonate Plastic, ABS Plastic, PVC Plastic, Polyimide Plastic, Garolite, Ceramic, Glass, Plastic | Clear | 0000000 | 000000 |
Light-Activated Epoxy Potting Compounds
Handle potted items within minutes—these potting compounds dry quickly when exposed to UV light. For added strength and durability, cure them with heat. Since they’re epoxy, they won’t break down from chemicals or moisture. They’re also excellent electrical insulators and withstand a wide range of temperatures. Use them to shield components from dust, moisture, chemicals, mechanical shock, and vibration. You need a mixer nozzle (not included) and a gun and plunger (both sold separately) to dispense. The nozzle lets you apply these compounds precisely.
For maximum effectiveness, these compounds need to be heat cured after they’re cured with UV light. Overall dry time includes heat curing at 149° F.

Dry Time | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mfr. Model No. | Container Size, fl. oz. | Consistency | Touch, min. | Overall, hrs. | Light Intensity Requirements to Reach Full Strength | Cure Type | Temp. Range, °F | For Use On | Color | Each | |
Loctite® Compounds—Extra Hard | |||||||||||
3336 | 1.4 | Thick Liquid | 5 | 16 | 60 seconds @ 30 mW/cm2 | UV Light | -65° to 350° | Aluminum, Brass, Bronze, Copper, Steel, Stainless Steel, Titanium, Fiberglass, Composites, Plastic, Silver | Amber | 0000000 | 000000 |

For Cartridge Size | Each | |
1.4 fl. oz. | 0000000 | 000000 |

For Cartridge Size | Each | |
1.4 fl oz. | 00000000 | 00000 |
Light-Activated Surface Fillers


Press these putty surface fillers in place to fill in holes, cracks, and dents. When exposed to sunlight or a UV lamp, they begin to harden immediately.
Epoxy fillers provide better adhesion and more corrosion resistance than polyester fillers.
Container | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Formulation | Size, fl. oz. | Type | Begins to Harden, sec. | Reaches Full Strength, min. | Consistency | For Max. Crack Wd. | Approx. Coverage @ Thick. | Max. Thick. | For Use Outdoors | Temp. Range, °F | Color | Finishing Method | For Use On | Each | |
Polyester | 3.5 | Tube | 1 | 3 | Putty | 1" | 24 sq. in. @ 1/4" | 1/2" | Yes | -40° to 220° | White | Drill, Sand, Tap | Aluminum, Brass, Copper, Steel, Stainless Steel, Cast Iron, Titanium, Polycarbonate Plastic, Polyurethane Rubber, ABS Plastic, PVC Plastic, CPVC Plastic, PETG Plastic, PVDF Plastic, Polyimide Plastic, Fiberglass, Wood | 00000000 | 000000 |
Epoxy | 3.5 | Bottle | 1 | 5 | Putty | 1" | 24 sq. in. @ 1/4" | 1/2" | Yes | -40° to 270° | Amber | Drill, Sand, Tap | Aluminum, Brass, Copper, Steel, Stainless Steel, Cast Iron, Titanium, Polycarbonate Plastic, Polyurethane Rubber, ABS Plastic, PVC Plastic, CPVC Plastic, PETG Plastic, PVDF Plastic, Polyimide Plastic, Fiberglass, Wood | 00000000 | 00000 |