HMC Electronics 62040 User Manual
Technical Data Sheet
LOCTITE®620
May-2004
PRODUCT DESCRIPTION
LOCTITE®620 provides the following product characteristics:
Technology Acrylic
Chemical Type Methacrylate Ester
Appearance (uncured) Green liquid
LMS
Components One component - requires no mixing
Viscosity High
Cure Anaerobic
Secondary Cure Activator
Application Retaining
Strength Medium to High
LOCTITE®620 is designed for the bonding of cylindrical fitting
parts. The product cures when confined in the absence of air
between close fitting metal surfaces and prevents loosening
and leakage from shock and vibration. Typical applications
include locating pins in radiator assemblies, sleeves into pump
housings and bearings in auto transmissions. Particularly
suitable for applications where temperature resistance up to
200°C is required.
TYPICAL PROPERTIES OF UNCURED MATERIAL
Specific Gravity @ 25 °C 1.16
Flash Point - See MSDS
Viscosity, Brookfield - RVT, 25 °C, mPa·s (cP):
Spindle 5, speed 20 rpm 5,000 to 12,000
LMS
Viscosity, EN 12092 - MV, 25 °C, after 180 s, mPa·s (cP):
Shear rate 129 s
-1
1,200 to 2,400
TYPICAL CURING PERFORMANCE
Cure Speed vs. Substrate
The rate of cure will depend on the substrate used. The graph
below shows the shear strength developed with time on steel
pins and collars compared to different materials and tested
according to ISO 10123.
% of Full Strength on Steel
Cure Time
100
75
50
25
0
1min 5min10min 30min 1h 3h 6h 24h 72h
Steel
Aluminum
Zinc Dichromate
Cure Speed vs. Bond Gap
The rate of cure will depend on the bondline gap. The following
graph shows shear strength developed with time on steel pins
and collars at different controlled gaps and tested according to
ISO 10123.
% of Full Strength on Steel
Cure Time
100
75
50
25
0
1min 5min10min 30min 1h 3h 6h 24h 72h
0.15mm
0.25mm
0.05mm
Cure Speed vs. Temperature
The rate of cure will depend on the temperature. The graph
below shows the shear strength developed with time at
different temperatures on steel pins and collars and tested
according to ISO 10123.
% of Full Strength on Steel
Cure Time
100
75
50
25
0
1min 5min10min 30min 1h 3h 6h 24h 72h
40°C
22°C
5°C
Cure Speed vs. Activator
Where cure speed is unacceptably long, or large gaps are
present, applying activator to the surface will improve cure
speed. The graph below shows shear strength developed with
time using Activator 7471 and 7649 on Zinc Dichromate steel
pins and collars and tested according to ISO 10123.
% of Full Strength on Steel
Cure Time
100
75
50
25
0
1min 5min10min 30min 1h 3h 6h 24h 72h
Activator 7471
Activator 7649
No Activator
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440
TDS LOCTITE®620, May-2004
TYPICAL PROPERTIES OF CURED MATERIAL
Physical Properties:
Coefficient of Thermal Expansion, ASTM D 696, K
-1
80×10
-6
Coefficient of Thermal Conductivity, ASTM C 177,
W/(m·K)
0.10
Specific Heat, kJ/(kg·K) 0.30
Elongation, at break, ASTM D 412, % <1
TYPICAL PERFORMANCE OF CURED MATERIAL
Adhesive Properties
After 24 hours @ 22 °C
Compressive Shear Strength, ISO 10123:
Steel pins and collars N/mm² ≥17.20
LMS
(psi) (2,495)
Cured for 24 hours @ 22 °C, followed by 24 hours @ 177 °C,
tested @ 22 °C
Compressive Shear Strength, ISO 10123:
Steel pins and collars N/mm² ≥24.10
LMS
(psi) (3,495)
TYPICAL ENVIRONMENTAL RESISTANCE
Cured for 1 week @ 22 °C
Compressive Shear Strength, ISO 10123:
Steel pins and collars
Hot Strength
Tested at temperature
% RT Strength
Temperature, °C
125
100
75
50
25
0
0 50 100 150 200 250
Heat Aging
Aged at temperature indicated and tested @ 22 °C
% Initial Strength at RT
Hours
200
150
100
50
0
0 100 500 1000 3000 5000
120°C
150°C
180°C
Chemical/Solvent Resistance
Aged under conditions indicated and tested @ 22 °C.
% of initial strength
Environment °C 100 hr 500 hr 1000 hr
Motor Oil 125 100 100 100
Unleaded Petrol 22 95 95 95
Brake fluid 22 100 100 100
Water Glycol 50/50 87 95 80 80
Ethanol 22 100 100 75
Acetone 22 95 95 95
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).
Where aqueous washing systems are used to clean the
surfaces before bonding, it is important to check for
compatibility of the washing solution with the adhesive. In
some cases these aqueous washes can affect the cure and
performance of the adhesive.
This product is not normally recommended for use on plastics
(particularly thermoplastic materials where stress cracking of
the plastic could result). Users are recommended to confirm
compatibility of the product with such substrates.
Directions for use
For Assembly
1. For best results, clean all surfaces (external and internal)
with a Loctite cleaning solvent and allow to dry.
2. If the material is an inactive metal or the cure speed is to
slow, spray with Activator 7471 or 7649 and allow to dry.
3. Shake the product thoroughly before use.
4. For Slip Fitted Assemblies, apply adhesive around the
leading edge of the pin and the inside of the collar and
use a rotating motion during assembly to ensure good
coverage.
5. For Press Fitted Assemblies, apply adhesive thoroughly
to both bond surfaces and assemble at high press on
rates.
6. For Shrink Fitted Assemblies the adhesive should be
coated onto the pin, the collar should then be heated to
create sufficient clearance for free assembly.
7. Parts should not be disturbed until sufficient handling
strength is achieved.
For Disassembly
1. Apply localized heat to the assembly to approximately 250
°C. Disassemble while hot.
For Cleanup
1. Cured product can be removed with a combination of
soaking in a Loctite solvent and mechanical abrasion
such as a wire brush.
Henkel Loctite Americas
+860.571.5100
Henkel Loctite Europe
+49.89.9268.0
Henkel Loctite Asia Pacific
+81.45.758.1810
For the most direct access to local sales and technical support visit: www.loctite.com
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440
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