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LORD® 305 adhesive is a general purpose, medium viscosity, two-component epoxy adhesive system used for applications that require strong, durable, chemically and environmentally resistant bonds. This adhesive system provides excellent adhesion to prepared metals, fiberglass reinforced plastics (FRP), phenolic, wood, prepared rubber and other materials. It is also used to bond cured rubber to itself and rubber to metal, including gaskets, bushings, shock-absorbing devices and rubber rolls. LORD® 305 adhesive can be either room temperature cured or heat cured for faster processing.
Unit of Measure

Specifications

Shelf Life

 N/A 2 y

Ambient Temperature

 N/A 65 ºF18 ºC

Film Thickness for T-Peel

 N/A 0.020 in

Cure Time at Room Temperature (RT) for T-Peel

 N/A 72 hour

Typical Properties

Appearance

 N/A Clear Amber Liquid
Viscosity at 77 Degree Fahrenheit (ºF) (25 Degree Celsius (ºC)) Temperature1 N/A 10,000 to 18,000 cP

Density

 N/A 9.4 to 10.0 lb/gal1126 to 1198 kg/m³

Flash Point (Closed Cup) Temperature

 N/A >200 ºF>93 ºC

Note for Typical Properties

 N/A Data is typical and not to be used for specification purposes.

Typical Properties of Resin Mixed with Hardener

Mix Ratio by Volume - General Purpose -30 to 250 Degree Fahrenheit (ºF) (-34 to 121 Degree Celsius (ºC)) Temperature, Mixed Stress Joint Design

 N/A 1:1

Mix Ratio by Weight - General Purpose -30 to 250 Degree Fahrenheit (ºF) (-34 to 121 Degree Celsius (ºC)) Temperature, Mixed Stress Joint Design

 N/A 1:2:1

Mix Ratio by Volume - High Temperature 50 to 250 Degree Fahrenheit (ºF) (10 to -121 Degree Celsius (ºC)) Temperature, Shear Stress Joint Design

 N/A 2:1

Mix Ratio by Weight - High Temperature 50 to 250 Degree Fahrenheit (ºF) (10 to -121 Degree Celsius (ºC)) Temperature, Shear Stress Joint Design

 N/A 2:4:1

Mix Ratio by Volume - Low Temperature, -40 to 100 Degree Fahrenheit (ºF) (-40 to 38 Degree Celsius (ºC)) Temperature, Peel Stress Joint Design

 N/A 1:2

Mix Ratio by Weight - Low Temperature, -40 to 100 Degree Fahrenheit (ºF) (-40 to 38 Degree Celsius (ºC)) Temperature, Peel Stress Joint Design

 N/A 1:1.7

Solids Content

 N/A 100 %

Working Time at 75 Degree Fahrenheit (ºF) (24 Degree Celsius (ºC)) Temperature, 54 Gram (g) Mass

 N/A 1 to 2 hour

Time to Handling Strength

 N/A 8 to 16 hour

Mixed Appearance

 N/A Blue Liquid

Cured Appearance

 N/A Translucent Blue

Note for Typical Properties of Resin Mixed with Hardener

 N/A Data is typical and not to be used for specification purposes.

Typical Cured Properties

Tensile Strength at Break

 N/A 2490 psi17.2 MPa

Test Method for Tensile Strength (Modified)

 N/A American Society for Testing and Materials (ASTM D882-83A)

Elongation

 N/A 31 %

Test Method for Elongation (Modified)

 N/A American Society for Testing and Materials (ASTM D882-83A)

Young's Modulus

 N/A 108500 psi748 MPa

Test Method for Young's Modulus (Modified)

 N/A American Society for Testing and Materials (ASTM D882-83A)

Glass Transition Temperature

 N/A 141 ºF61 ºC

Test Method for Glass Transition Temperature (By Dynamic Mechanical Analysis (DMA))

 N/A American Society for Testing and Materials (ASTM E1640-99)

Bond Performance

Lap Shear Strength Test at Room Temperature (Cold Rolled Steel to Cold Rolled Steel)

N/A 2240 psi15.4 MPa

Failure Mode for Lap Shear Strength Test at Room Temperature (Cold Rolled Steel to Cold Rolled Steel)

 N/A Adhesive Failure (A)

Lap Shear Strength Test at Room Temperature (Aluminum to Aluminum)

N/A 1890 psi13.0 MPa

Failure Mode for Lap Shear Strength Test at Room Temperature (Aluminum to Aluminum)

 N/A 36 Cohesive Failure (C)/Adhesive Failure (A)

Lap Shear Strength Test at Room Temperature (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC))

N/A 820 psi5.6 MPa

Failure Mode for Lap Shear Strength Test at Room Temperature (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC))

 N/A Fiber Tear (FT)

45 Degree (º) Peel Strength Test at Room Temperature (Natural Rubber to Cold Rolled Steel)

 N/A 37 lb/in6.5 N/mm

Failure Mode for 45 Degree (º) Peel Strength Test at Room Temperature (Natural Rubber to Cold Rolled Steel)

 N/A 58 Rubber Failure (R)/Adhesive Failure (A)

T-Peel Strength Test at Room Temperature (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR))

 N/A 84 lb/in14.7 N/mm

Failure Mode for T-Peel Strength Test at Room Temperature (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR))

 N/A Rubber Failure (R)

Lap Shear Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Cold Rolled Steel to Cold Rolled Steel)

 N/A 1100 psi7.6 MPa

Failure Mode for Lap Shear Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Cold Rolled Steel to Cold Rolled Steel)

 N/A Adhesive Failure (A)

Lap Shear Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Aluminum to Aluminum)

 N/A 1040 psi7.2 MPa

Failure Mode for Lap Shear Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Aluminum to Aluminum)

 N/A Adhesive Failure (A)

Lap Shear Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC))

N/A 490 psi3.4 MPa

Failure Mode for Lap Shear Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC))

N/A 13 Fiber Tear (FT)/Adhesive Failure (A)

45 Degree (º) Peel Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Natural Rubber to Cold Rolled Steel)

 N/A 24 lb/in4.2 N/mm

Failure Mode for 45 Degree (º) Peel Strength Test at Hot Strength, 180 Degree Fahrenheit (ºF) (82 Degree Celsius (ºC)) Temperature (Natural Rubber to Cold Rolled Steel)

 N/A 44 Rubber Failure (R)/Adhesive Failure (A)

Lap Shear Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Cold Rolled Steel to Cold Rolled Steel, Test after 24 Hours (h))

 N/A 2630 psi18.1 MPa

Failure Mode for Lap Shear Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Cold Rolled Steel to Cold Rolled Steel, Test after 24 Hours (h))

 N/A Adhesive Failure (A)

Lap Shear Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Aluminum to Aluminum, Test after 24 Hours (h))

 N/A 1840 psi12.7 MPa

Failure Mode for Lap Shear Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Aluminum to Aluminum, Test after 24 Hours (h))

 N/A Adhesive Failure (A)

Lap Shear Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC), Test after 24 Hours (h))

 N/A 600 psi4.1 MPa

Failure Mode for Lap Shear Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC), Test after 24 Hours (h))

 N/A Fiber Tear (FT)

45 Degree (º) Peel Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Natural Rubber to Cold Rolled Steel, Test after 24 Hours (h))

 N/A 33 lb/in5.8 N/mm

Failure Mode for 45 Degree (º) Peel Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Natural Rubber to Cold Rolled Steel, Test after 24 Hours (h))

 N/A 13 Fiber Tear (FT)/Adhesive Failure (A)

T-Peel Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR), Test after 24 Hours (h))

 N/A 83 lb/in14.5 N/mm

Failure Mode for T-Peel Strength Test after 7 Days in Hydrogen Dioxide H2O at 130 Degree Fahrenheit (ºF) (54 Degree Celsius (ºC)) Temperature (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR), Test after 24 Hours (h))

 N/A Stock Break (SB)

Lap Shear Strength Test after 14 Days Salt Spray Exposure (Cold Rolled Steel to Cold Rolled Steel, Test Immediately)

 N/A 2500 psi17.2 MPa

Failure Mode for Lap Shear Strength Test after 14 Days Salt Spray Exposure (Cold Rolled Steel to Cold Rolled Steel, Test Immediately)

 N/A Adhesive Failure (A)

Lap Shear Strength Test after 14 Days Salt Spray Exposure (Aluminum to Aluminum, Test Immediately)

 N/A 1790 psi12.3 MPa

Failure Mode for Lap Shear Strength Test after 14 Days Salt Spray Exposure (Aluminum to Aluminum, Test Immediately)

 N/A Adhesive Failure (A)

Lap Shear Strength Test after 14 Days Salt Spray Exposure (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC), Test Immediately)

 N/A 610 psi4.2 MPa

Failure Mode for Lap Shear Strength Test after 14 Days Salt Spray Exposure (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC), Test Immediately)

 N/A 100 Fiber Tear (FT)

T-Peel Strength Test after 14 Days Salt Spray Exposure (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR), Test Immediately)

 N/A 110 lb/in19.3 N/mm

Failure Mode for T-Peel Strength Test after 14 Days Salt Spray Exposure (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR), Test Immediately)

 N/A 83 Rubber Failure (R)/Stock Break (SB)

Lap Shear Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Cold Rolled Steel to Cold Rolled Steel, Test Immediately)

 N/A 2740 psi18.9 MPa

Failure Mode for Lap Shear Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Cold Rolled Steel to Cold Rolled Steel, Test Immediately)

 N/A Adhesive Failure (A)

Lap Shear Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Aluminum to Aluminum, Test Immediately)

 N/A 2010 psi13.8 MPa

Failure Mode for Lap Shear Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Aluminum to Aluminum, Test Immediately)

 N/A Adhesive Failure (A)

Lap Shear Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC), Test Immediately)

 N/A 660 psi4.5 MPa

Failure Mode for Lap Shear Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC), Test Immediately)

 N/A Fiber Tear (FT)

45 Degree (º) Peel Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Natural Rubber to Cold Rolled Steel), Test Immediately)

 N/A 41 lb/in7.2 N/mm

Failure Mode for 45 Degree (º) Peel Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38 Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Natural Rubber to Cold Rolled Steel), Test Immediately)

 N/A 50 Rubber Failure (R)/Adhesive Failure (A)

T-Peel Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR), Test Immediately)

 N/A 94 lb/in16.5 N/mm

Failure Mode for T-Peel Strength Test after 14 Days at 100 Degree Fahrenheit (ºF) (38Degree Celsius (ºC)) Temperature, 100% Relative Humidity (RH) (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR), Test Immediately)

 N/A 83 Rubber Failure (R)/Stock Break (SB)

Lap Shear Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) Temperature (Cold Rolled Steel to Cold Rolled Steel)

 N/A 2490 psi17.1 MPa

Failure Mode for Lap Shear Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) Temperature (Cold Rolled Steel to Cold Rolled Steel)

 N/A Adhesive Failure (A)

Lap Shear Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) Temperature (Aluminum to Aluminum)

 N/A 1600 psi11.0 MPa

Failure Mode for Lap Shear Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) Temperature (Aluminum to Aluminum)

 N/A Adhesive Failure (A)

Lap Shear Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC))

 N/A 720 psi5.0 MPa

Failure Mode for Lap Shear Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) (Sheet Molded Compound (SMC) to Sheet Molded Compound (SMC))

 N/A Fiber Tear (FT)

45 Degree (º) Peel Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) Temperature (Natural Rubber to Cold Rolled Steel)

 N/A 60 lb/in10.5 N/mm

Failure Mode for 45 Degree (º) Peel Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) Temperature (Natural Rubber to Cold Rolled Steel)

 N/A 85 Rubber Failure (R)/Adhesive Failure (A)

T-Peel Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR))

 N/A 78 lb/in13.6 N/mm

Failure Mode for T-Peel Strength Test at -30 Degree Fahrenheit (ºF) (-34 Degree Celsius (ºC)) (Styrene Butadiene Rubber (SBR) to Styrene Butadiene Rubber (SBR))

 N/A Rubber Failure (R)

Substrate Material

 N/A Cold Rolled Steel and Alumimum Natural Rubber Sheet Molded Compound (SMC) Styrene Butadiene Rubber (SBR)

Surface Treatment for Cold Rolled Steel and Aluminum

 N/A Grit Blast MEK Wipe

Surface Treatment for Sheet Molded Compound (SMC)

 N/A 320-Grit Sandpaper Dry Rag Wipe

Surface Treatment for Styrene Butadiene Rubber (SBR)

 N/A Primed with LORD® 7701 Surface Treatment

Surface Treatment for Natural Rubber

 N/A Primed with LORD® 7701 Surface Treatment

Bonded Parameters

 N/A 45 Degree Peels Metal Lap Shears Sheet Molded Compound (SMC) Lap Shears T-Peels

Bond Area for Metal Lap Shears

 N/A 1.0 x 1.5 in

Bond Area for Sheet Molded Compound (SMC) Lap Shears

 N/A 1.0 x 1.0 in

Bond Area for T-Peel

 N/A 1.0 x 3.0 in

Bond Area for 45 Degree (º) Peels

 N/A 1.0 x 1.0 in

Film Thickness for Metal Lap Shears

 N/A 0.010 in

Film Thickness for Sheet Molded Compound (SMC) Lap Shears

 N/A 0.030 in

Film Thickness for 45 Degree (º) Peels

 N/A 0.020 in

Cure Time at Room Temperature (RT) for Metal Lap Shears

 N/A 72 hour

Cure Time at Room Temperature (RT) for Sheet Molded Compound (SMC) Lap Shears

 N/A 72 hour

Cure Time at Room Temperature (RT) for 45 Degree (º) Peels

 N/A 72 hour

Mix Ratio By Weight for Metal Lap Shears

 N/A 1:1

Mix Ratio By Weight for Sheet Molded Compound (SMC) Lap Shears

 N/A 1:1

Mix Ratio By Weight for T-Peels

 N/A 1:1

Mix Ratio By Weight for 45 Degree (º) Peels

 N/A 1:1

Shelf Life/Storage

Shelf Life/Storage

 N/A Shelf life is two years from date of manufacture when stored at 40-80 ºF (4-27 ºC) in original, unopened container.

Features

Durable

 N/A Provides load bearing properties equal to or greater than the materials being bonded.

Environmentally Friendly

 N/A Contains no solvent, nonflammable and virtually odorless.

Environmentally Resistant

 N/A Resists moisture, sunlight and weathering.

Temperature Resistant

 N/A Performs at temperatures from -30 ºF to +250 ºF (-34 ºC to +121 ºC).

Chemically Resistant

 N/A Resists dilute acids, alkalis, solvents, greases and oils.

Excellent Engineering Properties

 N/A Provides low shrinkage, good creep properties and low water absorption.

Applications

Surface Preparation

 N/A Remove soil, grease, oil, fingerprints, dust, mold release agents, rust and other contaminants from the surfaces to be bonded by solvent degreasing or alkaline cleaning.

On metal surfaces which are free of oxidation, use an isopropyl alcohol wipe. If necessary, use an abrasive material to remove tarnish. Always follow abrasion by a second cleaning to ensure removal of loose particles.

When bonding cured rubber, allow LORD® 7701 adhesion enhancer/surface modifier to flash off before applying LORD® 305 adhesive. Prime glass and ceramic surfaces with LORD® AP-134 adhesion enhancer/surface modifier to promote adhesion.

Handle prepared surfaces carefully to avoid contamination. Assemble as soon as possible.

Mixing

 N/A Thoroughly mix the proper amount of resin and hardener until uniform in color and consistency. Be careful not to whip excessive air into the adhesive system. Handheld cartridges will automatically dispense the correct volumetric ratio of each component.

Heat buildup due to an exothermic reaction between the two components will shorten the working time of the adhesive. Mixing smaller quantities will minimize heat buildup. Do not use any adhesive that has begun to cure.

Applying

 N/A Apply the mixed adhesive to bond surfaces using automatic meter/mix/dispense equipment, handheld cartridges or any convenient tool such as a stiff brush, spatula or trowel. For general use, a fi lm thickness of approximately 0.02 inch (0.51 mm) is recommended. To control bondline thickness, a small amount of solid glass beads can be added into the mixed adhesive.

Join the parts in such a way as to avoid entrapped air. Apply only enough pressure to ensure good wetting of the adhesive on both surfaces. Squeezing a little adhesive out at the edges is usually a sign of proper assembly. It is not necessary to clamp the assembly unless movement during adhesive cure is likely.

Maximum adhesion will occur only with parts which mate well without the need for excessive clamping pressure during cure. Excessive clamping may squeeze too much adhesive from the bond area which can result in a poor bond.

Curing

 N/A LORD® 305 adhesive will cure to full strength in 24-48 hours, provided that the adhesive, substrates and ambient temperature are 65 ºF (18 ºC) or higher.

Higher temperatures will provide faster cure times; however, the bondline temperature should not exceed 325 ºF (162 ºC). Elevated temperature cure produces the highest bond strengths and impact resistance. Firm recommendations of cure times and temperatures depend on material composition and heating methods.

Once the adhesive has cured, it can be filed, sanded, machined or otherwise handled in the same way as a light metal. Paint, lacquers, enamels and other coatings can be applied to cured adhesive.

Cleanup

 N/A Clean excess adhesive on the bonded assembly, as well as the equipment, prior to the adhesive cure with hot water and detergent or an organic solvent such as ketones. Once adhesive has cured, heat the adhesive to 400 ºF (204 ºC) or above to soften the cured adhesive. This allows the parts to be separated and the adhesive to be more easily removed. Some success may be achieved with commercial epoxy strippers.

Additional Information

Additional Information

 N/A Values stated in this technical data sheet represent typical values as not all tests are run on each lot of material produced.

Information provided herein is based upon tests believed to be reliable. In as much as LORD® Corporation has no control over the manner in which others may use this information, it does not guarantee the results to be obtained. In addition, LORD® Corporation does not guarantee the performance of the product or the results obtained from the use of the product or this information where the product has been repackaged by any third party, including but not limited to any product end-user. Nor does the company make any express or implied warranty of merchantability or fitness for a particular purpose concerning the effects or results of such use.

LORD® and "Ask Us How™" are trademarks of LORD® Corporation or one of its subsidiaries.

LORD® provides valuable expertise in adhesives and coatings, vibration and motion control, and magnetically responsive technologies. Our people work in collaboration with our customers to help them increase the value of their products. Innovative and responsive in an ever-changing marketplace, we are focused on providing solutions for our customers worldwide. Ask Us How™.
  • 1 Brookfield HBF, Spindle 2, 10 rpm