HMC Electronics 68035 User Manual
Technical Data Sheet
LOCTITE®680™
December-2009
PRODUCT DESCRIPTION
LOCTITE®680™ provides the following product
characteristics:
Technology Acrylic
Chemical Type Methacrylate ester
Appearance (uncured) Green liquid
LMS
Fluorescence Positive under UV light
LMS
Components One component - requires no mixing
Viscosity Medium
Cure Anaerobic
Secondary Cure Activator
Application Retaining
Strength High
LOCTITE®680™ is designed for the bonding of cylindrical
fitting parts, particularly where low viscosity is required. The
product cures when confined in the absence of air between
close fitting metal surfaces and prevents loosening and
leakage from shock and vibration.
NSF International
Certified to ANSI/NSF Standard 61 for use in commercial and
residential potable water systems not exceeding 82° C. 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 1.1
Flash Point - See MSDS
Viscosity, Brookfield - RVT, 25 °C, mPa·s (cP):
Spindle , speed r/min 750 to 1,750
LMS
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 5min 10min 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 5min 10min 30min 1h 3h 6h 24h 72h
0.15 mm
0.2 mm
0.05 mm
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 5min 10min 30min 1h 3h 6h 24h 72h
22 °C
5 °C
40 °C
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440
TDS LOCTITE®680™, December-2009
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 the shear strength developed
with time on zinc dichromate steel pins and collars using
Activator 7471™ and 7649™ and tested according to ISO
10123.
% of Full Strength on Steel
Cure Time
100
75
50
25
0
1min 5min 10min 30min 1h 3h 6h 24h 72h
No activator
Activator 7471™
Activator 7649™
TYPICAL PROPERTIES OF CURED MATERIAL
Physical Properties:
Coefficient of Thermal Expansion,
ISO 11359-2, K
-1
80×10
-6
Coefficient of Thermal Conductivity, ISO 8302,
W/(m·K)
0.1
Specific Heat, kJ/(kg·K) 0.3
Elongation, at break, ISO 37, % <1
TYPICAL PERFORMANCE OF CURED MATERIAL
Adhesive Properties
Cured for 24 hours @ 22 °C
Compressive Shear Strength, ISO 10123:
Steel pins and collars N/mm² ≥19.3
LMS
(psi) (≥2,800)
Cured for 1 hour @ 93 °C, tested @ 22 °C
Compressive Shear Strength, ISO 10123:
Steel pins and collars N/mm² ≥24.1
LMS
(psi) (≥3,500)
TYPICAL ENVIRONMENTAL RESISTANCE
Cured for 1 week @ 22 °C
Compressive Shear Strength, ISO 10123:
Steel pins and collars
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
200
150
100
50
0
0 1000 2000 3000 4000 5000
120 °C
180 °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 125 100 100 100
Unleaded gasoline 22 100 100 100
Brake fluid 22 80 75 75
Water/glycol 50/50 87 100 90 80
Ethanol 22 95 95 95
Acetone 22 80 80 80
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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