HMC Electronics 42050 User Manual
Technical Data Sheet
LOCTITE®420™
January-2010
PRODUCT DESCRIPTION
LOCTITE®420™ provides the following product
characteristics:
Technology Cyanoacrylate
Chemical Type Ethyl cyanoacrylate
Appearance (uncured) Transparent, colorless to straw
colored liquid
LMS
Components One part - requires no mixing
Viscosity Very low
Cure Humidity
Application Bonding
Key Substrates Plastics, Rubbers and Metals
LOCTITE®420™ is a general purpose cyanoacrylate instant
adhesive.
Mil-A-46050C
LOCTITE®420™ is tested to the lot requirements of Military
Specification Mil-A-46050C. Note: This is a regional approval.
Please contact your local Technical Service Center for more
information and clarification.
Commercial Item Description A-A-3097:
LOCTITE®420™ has been qualified to Commercial Item
Description A-A-3097. Note: This is a regional approval.
Please contact your local Technical Service Center for more
information and clarification.
TYPICAL PROPERTIES OF UNCURED MATERIAL
Specific Gravity @ 25 °C 1.05
Viscosity, Cone & Plate, mPa·s (cP):
Temperature: 25 °C, Shear Rate: 3,000 s
-1
1 to 4
LMS
Viscosity, Brookfield - LVF, 25 °C, mPa·s (cP):
Spindle 1, speed 60 rpm 1 to 5
Vapour Pressure, hPa <1
Flash Point - See MSDS
TYPICAL CURING PERFORMANCE
Under normal conditions, the atmospheric moisture initiates the
curing process. Although full functional strength is developed
in a relatively short time, curing continues for at least 24 hours
before full chemical/solvent resistance is developed.
Cure Speed vs. Substrate
The rate of cure will depend on the substrate used. The table
below shows the fixture time achieved on different materials
at 22 °C / 50 % relative humidity. This is defined as the time to
develop a shear strength of 0.1 N/mm².
Fixture Time, seconds:
Mild Steel (degreased) 10 to 30
Aluminum (degreased) 5 to 15
Zinc dichromate 30 to 90
Neoprene <5
Rubber, nitrile <5
ABS 10 to 30
PVC 3 to 10
Polycarbonate 20 to 60
Phenolic 5 to 20
Cure Speed vs. Bond Gap
The rate of cure will depend on the bondline gap. Thin bond
lines result in high cure speeds, increasing the bond gap will
decrease the rate of cure.
Cure Speed vs. Humidity
The rate of cure will depend on the ambient relative humidity.
The following graph shows the tensile strength developed with
time on Buna N rubber at different levels of humidity.
% Full Cured Strength @ 22 °C
Cure Time, seconds
100
75
50
25
0
0 10 20 30 40 50 60
60% RH
40% RH
20% RH
Cure Speed vs. Activator
Where cure speed is unacceptably long due to large gaps,
applying activator to the surface will improve cure speed.
However, this can reduce ultimate strength of the bond and
therefore testing is recommended to confirm effect.
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440
TDS LOCTITE®420™, January-2010
TYPICAL PROPERTIES OF CURED MATERIAL
After 24 hours @ 22 °C
Physical Properties:
Coefficient of Thermal Expansion,
ISO 11359-2, K
-1
100×10
-6
Coefficient of Thermal Conductivity, ISO 8302,
W/(m·K)
0.1
Softening Point, DIN EN 1427, °C 165
Electrical Properties:
Dielectric Constant / Dissipation Factor, IEC 60250:
0.1-kHz 2 to 3.3 / <0.02
1-kHz 2 to 3.5 / <0.02
10-kHz 2 to 3.5 / <0.02
Volume Resistivity, IEC 60093, Ω·cm 2×10
15
to 10×10
15
Surface Resistivity, IEC 60093, Ω 10×10
15
to 80×10
15
Dielectric Breakdown Strength,
IEC 60243-1, kV/mm
25
TYPICAL PERFORMANCE OF CURED MATERIAL
Adhesive Properties
After 24 hours @ 22 °C
Lap Shear Strength, ISO 4587:
Steel (grit blasted) N/mm² 15 to 26
(psi) (2,175 to 3,770)
Aluminum (grit blasted) N/mm² 12 to 19
(psi) (1,740 to 2,755)
Zinc dichromate N/mm² 6 to 13
(psi) (870 to 1,885)
ABS N/mm² 6 to 20
(psi) (870 to 2,900)
PVC N/mm² 6 to 20
(psi) (870 to 2,900)
Polycarbonate N/mm² 6 to 20
(psi) (870 to 2,900)
Phenolic N/mm² 5 to 20
(psi) (725 to 2,900)
Neoprene N/mm² 5 to 15
(psi) (725 to 2,175)
Nitrile N/mm² 5 to 15
(psi) (725 to 2,175)
Tensile Strength, ISO 6922:
Steel N/mm² 12 to 25
(psi) (1,740 to 3,625)
Buna-N N/mm² 5 to 15
(psi) (725 to 2,175)
"T" Peel Strength, ISO 11339:
Steel (degreased) N/mm <0.5
(lb/in) (<2.8)
After 10 seconds @ 22 °C
Tensile Strength, ISO 6922:
Buna-N N/mm² ≥6.0
LMS
(psi) (≥870)
TYPICAL ENVIRONMENTAL RESISTANCE
Cured for 1 week @ 22 °C
Lap Shear Strength, ISO 4587:
Mild Steel (grit blasted)
Hot Strength
Tested at temperature
% Strength @ 22 °C
Temperature, °C
100
75
50
25
0
-50 0 50 100 150
Heat Aging
Aged at temperature indicated and tested @ 22 °C
% Initial Strength @ 22 °C
Exposure Time, hours
100
75
50
25
0
0 1000 2000 3000 4000 5000
60°C
80°C
100°C
Chemical/Solvent Resistance
Aged under conditions indicated and tested @ 22 °C.
% of initial strength
Environment °C 100 h 500 h 1000 h
Motor oil (MIL-L-46152) 40 100 100 95
Gasoline 22 100 100 100
Isopropanol 22 100 100 100
Ethanol 22 100 100 100
Freon TA 22 100 100 100
1,1,1 Trichloroethane 22 100 100 100
Heat/humidity 95% RH 40 80 75 65
Heat/humidity 95% RH
on polycarbonate
40 100 100 100
GENERAL INFORMATION
This product is not recommended for use in pure oxygen
and/or oxygen rich systems and should not be selected as
a sealant for chlorine or other strong oxidizing materials
For safe handling information on this product, consult the
Material Safety Data Sheet (MSDS).
Directions for use:
1. For best performance bond surfaces should be clean and
free from grease.
2. This product performs best in thin bond gaps (0.05 mm).
3. Excess adhesive can be dissolved with Loctite cleanup
solvents, nitromethane or acetone.
Henkel Americas
+860.571.5100
Henkel Europe
+49.89.320800.1800
Henkel Asia Pacific
+86.21.2891.8863
For the most direct access to local sales and technical support visit: www.henkel.com/industrial
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440
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