HMC Electronics 66040-LOC User Manual
Technical Data Sheet
LOCTITE®660™
December-2009
PRODUCT DESCRIPTION
LOCTITE®660™ provides the following product
characteristics:
Technology Acrylic
Chemical Type Urethane methacrylate
Appearance (uncured) Metallic gray paste
LMS
Fluorescence No
Components One component - requires no mixing
Viscosity High
Cure Anaerobic
Secondary Cure Activator
Application Retaining
Strength High
LOCTITE®660™ is designed for the bonding of cylindrical
fitting parts, particularly where bond gaps can approach 0.50
mm (0.02 in.). The product cures when confined in the absence
of air between close fitting metal surfaces and prevents
loosening and leakage from shock and vibration. This product
possesses excellent gap cure characteristics. Typical
applications include restoring correct fits on worn shafts, spun
bearings, and damaged keyways.
NSF International
Registered to NSF Category P1 for use as a sealant where
there is no possibilty of food contact in and around food
processing areas. 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 1.13
Flash Point - See MSDS
Viscosity, Brookfield - HBT, 25 °C, mPa·s (cP):
Spindle TB, speed 0.5 rpm,
Helipath
1,000,000 to 2,000,000
LMS
Spindle TB, speed 5.0 rpm,
Helipath
150,000 to 350,000
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 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
0.154 mm
0.27 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 5min10min 30min 1h 3h 6h 24h 72h
4 °C
40 °C
22 °C
Documentation Provided By HMC Electronics
33 Springdale Ave. Canton, MA 02021
http://www.hmcelectronics.com
(800) 482-4440
TDS LOCTITE®660™, 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 5min10min 30min 1h 3h 6h 24h 72h
Activator 7471™
Activator 7649™
No activator
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, % <2
TYPICAL PERFORMANCE OF CURED MATERIAL
Adhesive Properties
After 24 hours @ 22 °C
Compressive Shear Strength, ISO 10123:
Steel pins and collars N/mm² ≥17.2
LMS
(psi) (2,490)
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
150 °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) 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
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 too
slow, spray with Activator 7471™ or 7649™ and allow to
dry.
3. 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.
4. For Press Fitted Assemblies, apply adhesive thoroughly
to both bond surfaces and assemble at high press on
rates.
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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