Scotch-Weld TM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Technical Data May, 2015 Product Description 3MTM Scotch-WeldTM Epoxy Adhesives are high performance, two-part epoxy adhesives offering outstanding shear and peel adhesion, and very high levels of durability. Features * High shear strength * Controlled flow (3MTM Scotch-WeldTM Epoxy Adhesive DP420 NS Black) * High peel strength * Recognized as meeting UL 94 HB - Underwriters Laboratory Horizontal Burn Flammability Test (3MTM Scotch-WeldTM Epoxy Adhesive DP420 Off-White) * Outstanding environmental performance * Easy mixing * Low halogen content (3MTM Scotch-WeldTM Epoxy Adhesive DP420 LH) * 20 minute worklife Typical Uncured Physical Properties Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. 3MTM Scotch-WeldTM Epoxy Adhesive Product DP420 Black DP420 NS Black DP420 Off-White DP420 LH Viscosity (approx.) @ 73F (23C) Base Accelerator 20,000-50,000 cP 8,000-14,000 cP 190,000-270,000 cP 60,000-130,000 cP 20,000-50,000 cP 8,000-14,000 cP 20,000-50,000 cP 8,000-14,000 cP Base Resin Base Accelerator epoxy amine epoxy amine epoxy amine epoxy amine Color Base Accelerator black amber black amber white amber white amber Net Weight Lbs./Gallon Base Accelerator 9.3-9.7 9.0-9.4 9.4-9.8 9.1-9.5 9.3-9.7 9.0-9.4 9.3-9.7 9.0-9.4 Mix Ratio (B:A) Volume Weight 2:1 2:0.97 2:1 2:0.97 2:1 2:0.97 2:1 2:0.97 15 minutes 20 minutes 30 minutes -- -- -- 15 minutes 20 minutes 30 minutes 15 minutes 20 minutes 30 minutes Worklife, 73F (23C) 20 g mixed 10 g mixed 5 g mixed -1- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Typical Cured Properties Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. The properties of cured 3MTM Scotch-WeldTM Epoxy Adhesive DP420 NS Black and 3MTM Scotch-WeldTM Epoxy Adhesive DP420 LH are expected to be similar to the properties of 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black and 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Off-White, respectively as described by data in the following sections of this technical data sheet. An exception to this is the concentration of halogens in Scotch-Weld DP420 LH. Scotch-Weld DP420 LH is a form of Scotch-Weld DP420 Off-White that can be considered "low halogen". Low halogen is defined by the Electrotechnical Commission (IEC) 61249-2-21 standard as having less than 900 ppm chlorine, 900 ppm bromine, and less than 1500 ppm total chlorine and bromine. 3MTM Scotch-WeldTM DP420 LH Test Results Halogens (determined by ion chromatography) Total Chlorine (ppm) Total Bromine (ppm) Total Halogens (ppm) 720 <5 <800 Product 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Off-White Physical Color Black Opaque, off-white Shore D Hardness 75-80 75-80 80 x 10-6 194 x 10-6 85 x 10-6 147 x 10-6 0.104 0.104 Electrical Dielectric Strength (ASTM D 149) 888 volts/mil 690 volts/mil Volume Resistivity (ASTM D 257) 1.6 x 1015 ohm-cm 1.3 x 1014 ohm-cm Thermal Coefficient of Thermal Expansion (in./in./C) Below Tg Above Tg Thermal Conductivity (btu - ft./ft.2 - hr. - F) @ 45C -2- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Typical Curing Characteristics Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Rate of Strength Build-Up Aluminum, Overlap Shear (7 mil Bondline) (ASTM D 1002-72) Bonds Tested at 73F (23C) 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black Time in Oven Cure Temperature 73F (23C) 120F1 (49C) 140F1 (60C) -- -- -- 300 800 3000 3700 4500 -- 2300 4700 -- -- -- -- -- 3200 -- 4700 -- -- -- -- -- 15 min. 30 60 2 hr. 3 5 6 24 1This represents the oven temperature to which the bonds were subjected for the prescribed time. The average bondline temperature during the cure time will be somewhat lower than the oven temperature. NOTE: The data in this data sheet were generated using the 3MTM EPXTM Applicator System equipped with an EPX static mixer, according to manufacturer's directions. Thorough hand-mixing will afford comparable results. -3- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Typical Adhesive Performance Characteristics Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Substrates and Testing A. Overlap Shear (ASTM D 1002-72) Overlap shear (OLS) strengths were measured on 1 in. wide 1/2 in. overlap specimens. These bonds were made individually using 1 in. x 4 in. pieces of substrate except for aluminum. Two panels 0.063 in. thick, 4 in. x 7 in. of 2024T-3 clad aluminum were bonded and cut into 1 in. wide samples after 24 hours. The thickness of the bondline was 0.005-0.008 in. All strengths were measured at 73F (23C) except where noted. The separation rate of the testing jaws was 0.1 in. per minute for metals, 2 in. per minute for plastics and 20 in. per minute for rubbers. The thickness of the substrates were: steel, 0.060 in.; other metals, 0.05-0.064 in.; rubbers, 0.125 in.; plastics, 0.125 in. B. T-peel (ASTM D 1876-61T) T-peel strengths were measured on 1 in. wide bonds at 73F (23C). The testing jaw separation rate was 20 inches per minute. The substrates were 0.032 in. thick. C. Bell Peel (ASTM D 3167) Bell peel strengths were measured on 1/2 in. wide bonds at the temperatures noted. The testing jaw separation rate was 6 in. per minute. The bonds are made with 0.064 in. bonded to 0.025 in. thick adherends. D. Cure Cycle With the exception of Rate of Strength Build-Up Tests, all bonds, were cured 7 days at 73F (23C) at 50% RH before testing or subjected to further conditioning or environmental aging. Aluminum, Overlap Shear, at Temperature (PSI) 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Off-White 4500 4500 1260 2250 2980 2690 570 4500 4500 450 700 750 2500 200 Scotch-Weld Epoxy Adhesive DP420 Black Scotch-Weld Epoxy Adhesive DP420 Off-White Etched Oakite degrease MEK/abrade/MEK 4500 4000 2500 4500 3500 3500 Cold Rolled Steel- Oakite degrease MEK/abrade/MEK -- 2200 4000 2700 Copper- MEK/abrade/MEK 5000 4000 Brass- MEK/abrade/MEK 2800 4100 Stainless Steel- MEK/abrade/MEK 1800 1700 2900 3000 2000 2100 -67F (-55C) 73F (23C) 180F (82C) (15 min.)1 (30 min.)1 (60 min.)1 (4 hr.)1 250F (121C) (15 min.)1 1Represents time in test chamber oven before test. Metals, Overlap Shear, Tested @ 73F (23C) (PSI) Aluminum- Galvanized Steel- Hot dipped Electrodeposited -4- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Typical Adhesive Performance Characteristics (continued) Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Substrates and Testing (continued) Aluminum, T-Peel (PIW), at Temperature 3MTM Scotch-WeldTM 3MTM Scotch-WeldTM Epoxy Adhesive Epoxy Adhesive DP420 Black DP420 Off-White -67F (-55C) 73F (23C) 180F (82C) 9.3 50 20 5-10 50 3-5 Scotch-Weld Epoxy Adhesive DP420 Black Scotch-Weld Epoxy Adhesive DP420 Off-White Metals, T-Peel, Tested @ 73F (23C) (PIW) Aluminum, etched 17-20 mil bondline 5-8 mil bondline 60 50 50 40 Cold Rolled Steel 17-20 mil bondline Oakite degreased MEK/abrade/MEK 40 25 40 25 Scotch-Weld Epoxy Adhesive DP420 Black Scotch-Weld Epoxy Adhesive DP420 Off-White 20 82 18 not tested Aluminum, Bell Peel (PIW), at Temperature -67F (-55C) 73F (23C) 180F (82C) Other Substrates, Overlap Shear Tested @ 73F (23C) (PSI) Surf. Prep. 11 Scotch-Weld Substrate ABS PVC Polycarbonate Polyacrylic Polystryene FRP Phenolic SBR/Steel Neoprene/Steel 1Isopropyl Scotch-Weld Epoxy Adhesive Epoxy Adhesive DP420 Black DP420 Off-White 450 4003 440 190 380 600 14003 70 80 320 220 400 230 350 350 14003 1503 40 Surf. Prep. 22 Scotch-Weld Scotch-Weld Epoxy Adhesive DP420 Black Epoxy Adhesive DP420 Off-White 550 3603 450 450 580 11003 13003 1803 1003 500 300 550 280 380 13003 14003 1503 803 Alcohol Wipe. See Surface Preparation Section D for additional information. 2Isopropyl Alcohol/Abrade/Isopropyl Alcohol: See Surface Preparation Section E for additional information. 3Substrate failure. -5- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Typical Adhesive Performance Characteristics (continued) Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes. Substrates and Testing (continued) Environmental Resistance Aluminum (Etched) Measured by Overlap Shear Tested @ 73F (23C) (PSI)1 (ASTM D 1002-72) 3MTM Scotch-WeldTM 3MTM Scotch-WeldTM Epoxy Adhesive Epoxy Adhesive DP420 Black DP420 Off-White Environment Condition 73F (23C)/50% RH 30 d2 4900 5100 Distilled Water 30 d, i3 4200 4700 Water Vapor 120F (49C)/100% RH, 30 d 200F (93C)/100% RH, 14 d 4000 4000 4700 3000 Antifreeze/H2O (50/50) 180F (82C), 30 d, i 3000 4200 Isopropyl Alcohol 73F (23C), 30 d, i 4500 5300 Methyl Ethyl Ketone 73F (23C), 30 d, i 3500 4600 Salt Spray (5%) 95F (35C), 30 d -- 5100 Skydrol LD-4 150F (66C), 30 d, i 4000 5400 1Data reported are actual values from the lots tested and may be higher than values published elsewhere in this data sheet. 2 d = days 3 i = immersion 3MTM EPXTM Pneumatic Applicator Delivery Rates 200 ml Applicator - Maximum Pressure 58 psi 6mm Nozzle gms/minute 10mm Nozzle gms/minute 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black 29.6 113 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Off-White 31.1 132 Adhesive* *Tests were run at a temperature of 70F 2F (21C 1C) and at maximum applicator pressure. -6- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Handling/Application Information Directions for Use 3MTM Scotch-WeldTM Epoxy Adhesive DP420 is supplied in dual syringe plastic duopak cartridges as part of the 3MTM EPXTM Applicator System. The duo-pak cartridges are supplied in 37 ml, 200 ml and 400 ml configurations. To use the EPX cartridge system simply insert the duo-pak cartridge into the EPX applicator. Next, remove the duo-pak cartridge cap and expel a small amount of adhesive to be sure both sides of the duo-pak cartridge are flowing evenly and freely. If simultaneous mixing of Part A and Part B is desired, attach the EPX mixing nozzle to the duo-pak cartridge and begin dispensing the adhesive. When mixing Part A and Part B manually the components must be mixed in the ratio indicated in the typical uncured properties section of this data sheet. Complete mixing of the two components is required to obtain optimum properties. Two-part mixing/proportioning/dispensing equipment is available for intermittent or production line use. These systems are ideal for line uses because of their variable shot size and flow rate characteristics and are adaptable to most applications. Apply adhesive to clean, dry surfaces, joint parts and secure until adhesive sets (see rate of strength build up). Surface Preparation The following surface preparations were used for substrates described in this Technical Data Sheet. A. Aluminum Etch Optimized FPL Etch - 3M (test method C-2803) 1. Alkaline degrease - Oakite 164 solution (9-11 oz./gallon water) at 190F 10F (88C 5C) for 10-20 minutes. Rinse immediately in large quantities of cold running water (3M test method C-2802). 2. Optimized FPL Etch Solution (1 liter): Material Amount Distilled Water 700 ml plus balance of liter (see below) Sodium Dichromate 28 to 67.3 grams Sulfuric Acid 287.9 to 310.0 grams Aluminum Chips 1.5 grams/liter of mixed solution To prepare 1 liter of this solution, dissolve sodium dichromate in 700 ml of distilled water. Add sulfuric acid and mix well. Add additional distilled water to fill to 1 liter. Heat mixed solution to 66 to 71C (150 to 160F). Dissolve 1.5 grams of 2024 bare aluminum chips per liter of mixed solution. Gentle agitation will help aluminum dissolve in about 24 hours. To FPL etch panels, place them in the above solution at 150 to 160F (66 to 71C) for 12 to 15 minutes. Note: Review and follow precautionary information provided by chemical suppliers prior to preparation of this etch solution. 3. Rinse immediately in large quantities of clear running tap water. -7- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Surface Preparation (continued) 4. Dry - air dry approximately 15 minutes followed by force dry at 140F (60C) maximum for 10 minutes (minimum). 5. Both surface structure and chemistry play a significant role in determining the strength and permanence of bonded structures. It is therefore advisable to bond or prime freshly primed clean surfaces as soon as possible after surface preparation in order to avoid contamination and/or mechanical damage. Please contact your 3M sales representative for primer recommendations. B. Oakite Degrease Oakite 164 solutions (9-11 oz./gallon of water) at 190F 10F (88C 5C) for 2 minutes. Rinse immediately in large quantities of cold running water. C. MEK/Abrade/MEK Wipe surface with a methyl ethyl ketone (MEK) soaked swab, abrade and wipe with a MEK soaked swab.* Allow solvent to evaporate before applying adhesive. *Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer's precautions and directions for use. D. Isopropyl Alcohol Wipe Only Surface Preparation Wipe surface with an isopropyl alcohol soaked swab.* Allow solvent to evaporate before applying adhesive. *Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer's precautions and directions for use. E. Isopropyl Alcohol/Abrade/Isopropyl Alcohol Surface Preparation Wipe surface with an isopropyl alcohol soaked swab, abrade using clean fine grit abrasives, and wipe with an isopropyl alcohol soaked swab.* Then allow solvent to evaporate before applying adhesive. *Note: When using solvents, extinguish all ignition sources, including pilot lights, and follow the manufacturer's precautions and directions for use. -8- 3MTM Scotch-WeldTM Epoxy Adhesive DP420 Black * DP420 NS Black * DP420 Off-White * DP420 LH Storage Store products at 60-80F (15-27C) for maximum shelf life. Shelf Life These products have a shelf life of 15 months in original containers at room temperature. Bulk containers have a shelf life of 2 years in their unopened containers. Precautionary Information Refer to Product Label and Material Safety Data Sheet for health and safety information before using this product. For additional health and safety information, call 1-800-364-3577 or (651) 737-6501. Technical Information The technical information, recommendations and other statements contained in this document are based upon tests or experience that 3M believes are reliable, but the accuracy or completeness of such information is not guaranteed. Product Use Many factors beyond 3M's control and uniquely within user's knowledge and control can affect the use and performance of a 3M product in a particular application. Given the variety of factors that can affect the use and performance of a 3M product, user is solely responsible for evaluating the 3M product and determining whether it is fit for a particular purpose and suitable for user's method of application. 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Limitation of Liability Except where prohibited by law, 3M will not be liable for any loss or damage arising from the 3M product, whether direct, indirect, special, incidental or consequential, regardless of the legal theory asserted, including warranty, contract, negligence or strict liability. IS O 9001: 2008 This Industrial Adhesives and Tapes Division product was manufactured under a 3M quality system registered to ISO 9001: 2008 standards. Industrial Adhesives and Tapes Division 3M Center, Building 225-3S-06 St. Paul, MN 55144-1000 800-362-3550 * 877-369-2923 (Fax) 3M, Scotch-Weld and EPX are trademarks of 3M Company. (c)3M 2012 78690097106 www.3M.com/structuraladhesves -9- Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: 3M: DP420 DP-420 OFF-WHITE