TechnicalDataSheet LOCTITE 420 January -2010 PRODUCT DESCRIPTION Cure Speed vs. Substrate LOCTITE 420 provides the following product The rate ofcure willdepend on thesubstrateused. Thetable below showsthefixture time achieved on differentmaterials characteristics: at22 C / 50% relative humidity.Thisisdefined asthetime to Technology Cyanoacrylate develop a shearstrengthof0.1N/mm. Chemical Type Ethylcyanoacrylate Fixture Time, seconds: Appearance (uncured) Transparent, colorlessto straw MildSteel (degreased) 10 to30 LMS colored liquid Aluminum (degreased) 5 to15 Components One part -requires nomixing Zinc dichromate 30 to90 Viscosity Very low Neoprene <5 Cure Humidity Rubber, nitrile <5 Application Bonding ABS 10 to30 PVC 3 to10 Key Substrates Plastics,Rubbers and Metals Polycarbonate 20 to60 LOCTITE 420 isa general purpose cyanoacrylate instant Phenolic 5 to20 adhesive . Mil-A- 46050C Cure Speed vs. Bond Gap The rate ofcure willdepend on thebondlinegap. Thinbond LOCTITE 420 istestedtothelotrequirements of Military linesresultinhighcure speeds,increasingthebond gap will SpecificationMil-A-46050C. Note: Thisisa regionalapproval. decrease therate ofcure. Pleasecontactyour localTechnicalService Center for more informationand clarification. Cure Speed vs. Humidity The rate ofcure willdepend on theambient relative humidity. The followinggraph showsthetensilestrengthdeveloped with Commercial Item Description A-A-3097: time onBuna N rubber atdifferentlevelsofhumidity. LOCTITE 420 hasbeen qualifiedto Commercial Item DescriptionA-A-3097. Note: Thisisa regional approval. 100 Pleasecontactyour localTechnicalService Center for more informationand clarification. 75 60% RH TYPICAL PROPERTIES OF UNCURED MATERIAL 50 Specific Gravity 25 C 1.05 Viscosity,Cone & Plate,mPas (cP): -1 LMS Temperature: 25 C, Shear Rate:3,000s 1 to4 40% RH 25 Viscosity,Brookfield -LVF, 25 C, mPas (cP): Spindle1,speed 60 rpm, 1 to5 20% RH Vapour Pressure,hPa <1 0 FlashPoint-See SDS 0 10 20 30 40 50 60 Cure Time, seconds TYPICAL CURING PERFORMANCE Cure Speed vs. Activator Under normal conditions,theatmosphericmoistureinitiatesthe Where cure speed isunacceptably longdue tolarge gaps, curing process. Althoughfullfunctionalstrengthisdeveloped applying activatortothe surface willimprove cure speed. ina relatively shorttime,curing continuesforatleast24 hours However, thiscan reduce ultimatestrengthof thebond and before fullchemical/solventresistanceisdeveloped. therefore testingisrecommended toconfirm effect. % Full Cured Strength 22 C TDS LOCTITE 420 , January -2010 TYPICAL PROPERTIES OF CURED MATERIAL Hot Strength After 24 hours 22 C Testedattemperature Physical Properties : 100 -6 CoefficientofThermal Expansion, 10010 -1 ISO11359-2,K CoefficientofThermal Conductivity, ISO8302, 0.1 75 W/(mK) SofteningPoint,DINEN 1427,C 165 50 Electrical Properties : DielectricConstant/DissipationFactor,IEC 60250 : 0.1-kHz 2 to3.3/<0.02 25 1-kHz 2 to3.5/<0.02 10-kHz 2 to3.5/<0.02 15 15 Volume Resistivity,IEC 60093,cm 210 to1010 0 15 15 -50 0 50 100 150 Surface Resistivity,IEC 60093, 1010 to8010 Temperature, C DielectricBreakdown Strength, 25 IEC 60243-1,kV/mm Heat Aging Aged attemperature indicatedand tested 22 C TYPICAL PERFORMANCE OF CURED MATERIAL 100 60C Adhesive Properties After 24 hours 22 C 75 Lap Shear Strength,ISO4587: Steel (gritblasted) N/mm 15 to26 (psi) (2,175 to3,770) 50 Aluminum (gritblasted) N/mm 12 to19 (psi) (1,740 to2,755) 100C Zinc dichromate N/mm 6 to13 25 (psi) (870 to1,885) ABS N/mm 6 to20 (psi) (870 to2,900) 0 PVC N/mm 6 to20 0 1000 2000 3000 4000 5000 (psi) (870 to2,900) Exposure Time, hours Polycarbonate N/mm 6 to20 (psi) (870 to2,900) Chemical/Solvent Resistance Phenolic N/mm 5 to20 Aged under conditionsindicatedand tested 22 C. (psi) (725 to2,900) % of initial strength Neoprene N/mm 5 to15 Environment C 100 h 500h 1000 h (psi) (725 to2,175) Motoroil(MIL-L-46152) 40 100 100 95 Nitrile N/mm 5 to15 (psi) (725 to2,175) Gasoline 22 100 100 100 TensileStrength,ISO6922: Isopropanol 22 100 100 100 Steel N/mm 12 to25 Ethanol 22 100 100 100 (psi) (1,740 to3,625) Freon TA 22 100 100 100 Buna-N N/mm 5 to15 (psi) (725 to2,175) 1,1,1Trichloroethane 22 100 100 100 Heat/humidity95% RH 40 80 75 65PeelStrength,ISO11339: Heat/humidity95% RH Steel (degreased) N/mm <0.5 40 100 100 100 onpolycarbonate (lb/in) (<2.8) After 10 seconds 22 C GENERAL INFORMATION TensileStrength,ISO6922: This product is not recommended for use in pure oxygen LMS Buna-N N/mm 6.0 and/or oxygen rich systems and should not be selected as (psi) (870 ) asealant for chlorine or other strong oxidizing materials. For safe handling information on this product, consult the TYPICAL ENVIRONMENTAL RESISTANCE Safety Data Sheet (SDS). Cured for 1 week 22 C Lap Shear Strength,ISO4587: MildSteel (gritblasted) Directions for use: 1. For bestperformance bond surfacesshouldbe clean and free from grease . 2. Thisproduct performs bestinthinbond gaps(0.05mm) . 3. Excess adhesive can be dissolvedwith Loctitecleanup solvents,nitromethaneor acetone. Henkel Americas Henkel Europe Henkel AsiaPacific +860.571.5100 +49.89.320800.1800 +86.21.2891.8859 For the most direct access to local sales and technical support visit: www.henkel.com/industrial 80C % Initial Strength 22 C % Strength 22 C