HMC Electronics 62040 Loctite 620 Retaining Compound, High Temperature - 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