Technical Data Sheet
Product 641
Worldwide Version, October 1995
% of Full Strength on steel
PRODUCT DESCRIPTION
LOCTITE
廬
Product 641 is a single component anaerobic
retaining adhesive for cylindrical joints. The product cures
when confined in the absence of air between close fitting metal
surfaces. This product develops medium strength to facilitate
disassembly.
TYPICAL APPLICATIONS
Used to bond cylindrical fitting parts, particularly where
disassembly is required for service operations. Applications
included retention of bearings onto shafts and into housings.
PROPERTIES OF UNCURED MATERIAL
Typical
Chemical Type
Appearance
Specific Gravity @ 25擄C
Viscosity @ 25擄C, mPa.s (cP)
Brookfield RVT
Spindle 2 @ 2.5 rpm
@ 20 rpm
DIN 54453, MV
D = 277 s
-1
after t=180secs
Flash Point (TCC),
擄C
Value
Methacrylate Ester
Yellow liquid
1.07
Range
100
0.05mm
75
0.15mm
50
25
0.25mm
0
5min 10min
30min 1hr
3hr
6hr
24hr
72hr
Cure Time, Hours
Cure speed vs. temperature
The rate of cure will depend on the ambient temperature. The
graph below shows shear strength developed with time on steel
pins and collars at different temperatures and tested according
to ISO 10123.
1,950
525
135
>93
1,300 to 2,600
350 to 700
90 to 180
% of Full Strength on steel
100
22擄C
75
40擄C
50
5 擄C
TYPICAL CURING PERFORMANCE
Cure speed vs. substrate
The rate of cure will depend on substrate used. The graph
below shows 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
100
25
0
5min 10min
30min 1hr
3hr
6hr
24hr
72hr
Cure Time, Hours
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 N and T on zinc dichromated steel
pins and collars and tested according to ISO 10123.
% of Full Strength on steel
100
75
Steel
50
Aluminium
25
0
5min 10min
30min 1hr
3hr
Zinc Dichromate
6hr
24hr
72hr
75
Act N
Cure Time, Hours
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.
50
Act T
25
No Activator
0
5min 10min
30min 1hr
3hr
6hr
24hr
72hr
Cure Time, Hours
TYPICAL PROPERTIES OF CURED MATERIAL
Physical Properties
Coefficient of thermal expansion, ASTM D696, K
-1
Coefficient of thermal conductivity, ASTM C177, W.m
-
1
K
-1
Specific Heat , kJ.kg
-1
K
-1
80 x 10-
6
0.1
0.3
NOT FOR PRODUCT SPECIFICATIONS
THE TECHNICAL DATA CONTAINED HEREIN ARE INTENDED AS REFERENCE ONLY.
PLEASE CONTACT LOCTITE CORPORATION QUALITY DEPARTMENT FOR ASSISTANCE AND RECOMMENDATIONS ON SPECIFICATIONS FOR THIS PRODUCT.
ROCKY HILL, CT FAX: +1 (860)-571-5473
DUBLIN, IRELAND FAX: +353-(1)-451 - 9959
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