ABLESTIK 2115 | Krayden

Main features

Shock- and Temperature-Cycling Resistance
Low-Viscosity Precision Optic Bonding
60-Watt Laser-Energy Resistance

Product Description

LOCTITE ABLESTIK 2115 BIPAX is a two-component, clear epoxy adhesive formulated for bonding optical components where alignment accuracy is essential. Supplied at a 100:30 resin-to-hardener mix ratio in a BIPAX mixing-dispenser package, it cures at room temperature over 24 hours or faster with an alternative 1-to-2-hour cure at 65°C, and supports continuous service from -70°C to 100°C. The adhesive is used in laser fabrication and other optic applications, is capable of withstanding 30 seconds of 60-watt direct laser energy, and has been used in cycling applications down to 4 K. Cured bonds offer resistance to water, weathering, ozone, most petroleum solvents, mild acids and alkalis, and other chemicals, bonding glass, rigid plastics, ceramic, and metals.

Key features

Low viscosity, low shrinkage: 250 cP mixed viscosity supports precise, controlled application in optical assembly.
Excellent mechanical shock and temperature cycling resistance: Maintains bond integrity through thermal cycling, including cryogenic use down to 4 K.
High shear strength: 3,800 psi lap shear strength on aluminum-to-aluminum bonds.

Applications / Suitable for: Laser fabrication and other optic applications requiring precise alignment, including cryogenic and thermal cycling environments.

TDS, SDS & Technical Documents

Technical Specifications

General Properties

Appearance

Clear

Refractive index

1.55

Specific Gravity

1.22

Physical Properties

Thixotropic index

Viscosity

250 mPa.s

Thermal Properties

Glass Transition Temperature (Tg)

55 °C

Operating Temperature

-70 to 100 °C

Additional Information

Optical and Precision Bonding Epoxy Adhesives

LOCTITE ABLESTIK 2115 BIPAX

LOCTITE ABLESTIK 2115 BIPAX is a two-component, clear epoxy adhesive for precision bonding of optical components where alignment accuracy is important. It combines low viscosity and low shrinkage with mechanical shock and temperature-cycling resistance, bonds glass, rigid plastics, ceramic, and metals, and is supplied in BIPAX packaging for controlled mixing.

Two-component epoxyClearLow viscosityLow shrinkage

Technical properties

Typical pre-cure properties

Values below describe the mix ratio or mixed adhesive before cure. Mixed-material values are kept distinct from the separate resin and hardener component states. Values are typical.

LOCTITE ABLESTIK 2115 BIPAX typical pre-cure properties
Property	Value	Unit	Method / condition
Mix ratio, resin : hardener	100 : 30	by weight	Mixing ratio
Viscosity, mixed	250	cP	At 25 deg C, after mixing
Thixotropic index	1.0	-	Mixed material
Specific gravity, mixed	1.22	-	Mixed material

Processing

Mixing, application and cure

LOCTITE ABLESTIK 2115 BIPAX is supplied in a mixing-dispenser package. Surface preparation, thorough component mixing, the available working period after mixing, maintaining contact between the bonded surfaces, and selection of the room-temperature or elevated-temperature cure schedule are the principal processing considerations.

Surface preparation: Carefully clean and dry all surfaces before mixing or applying the adhesive.

Mixing and working time: Mix resin and hardener at 100 : 30 by weight. Remove the BIPAX clamp and mix thoroughly until uniform. Typical pot life of the mixed material is 2 hours.

Application and assembly: Apply the mixed adhesive to the prepared surfaces and bring the parts together. Maintain contact between the bonded surfaces until the adhesive is fully cured.

Cure schedule: Cure for 24 hours at 25 deg C or use the alternative elevated-temperature schedule of 1 to 2 hours at 65 deg C.

Storage and handling

Store the product in its unopened container in a dry location at an optimal storage temperature of 27 deg C. If ingredients crystallize during low-temperature storage, warm the material gently at 52 deg C for 30 minutes before mixing. Material removed from the original container should not be returned after use because it may become contaminated.

Final-state properties

Typical cured properties

Values describe the cured adhesive and are typical. Where a specific test method is not available in the supplied information, the method is identified as not stated rather than inferred.

LOCTITE ABLESTIK 2115 BIPAX typical cured properties
Property	Value	Unit	Method / condition
Hardness	78	Shore D	Cured material; method not stated
Glass transition temperature (Tg)	55	deg C	Cured material; method not stated
Coefficient of thermal expansion	5.50x10^-5	cm/cm/deg C	Cured material; method not stated
Refractive index	1.55	-	Cured material; method not stated
Izod impact strength	0.22	ft-lb/in. of notch	Cured material; method not stated
Volume resistivity	9.00x10^8	ohm cm	At 25 deg C; method not stated
Dielectric strength	430	volts/mil	Cured material; method not stated
Lap shear strength, Al to Al	3,800	psi	Aluminum-to-aluminum bond; method not stated

Applications

Optical bonding applications

Documented use contexts include laser fabrication, precision optical component bonding, and optical assemblies exposed to substantial temperature cycling.

Laser fabrication

The adhesive is used for laser fabrication and is reported to withstand 30 seconds of 60-watt direct laser energy. Its clear epoxy form, low viscosity, and low shrinkage support evaluation for optical bonding where alignment accuracy is important.

Precision optical component bonding

For optical assemblies requiring controlled component positioning, the adhesive bonds glass, rigid plastics, ceramic, and metals. Its low viscosity and low shrinkage are relevant where adhesive placement and alignment stability are important evaluation factors.

Cryogenic and temperature-cycling optical assemblies

The adhesive has been used in cycling applications down to 4 K and is described as resistant to mechanical shock and temperature cycling. These characteristics support evaluation where optical assemblies experience substantial temperature variation.

Next steps

Evaluate LOCTITE ABLESTIK 2115 BIPAX for your optical bonding process

Krayden can help review whether LOCTITE ABLESTIK 2115 BIPAX fits your optical bonding process, including substrate combination, alignment requirements, mixed-material handling, working time, cure schedule, service-temperature considerations, and the relevance of its cured mechanical and electrical properties to your evaluation.