Technical Data Sheet
Product 638
Worldwide Version, October 1995
PRODUCT DESCRIPTION
LOCTITE
廬
retaining adhesive which develops high strength rapidly when
confined in the absence of air between close fitting metal
surfaces.
TYPICAL APPLICATIONS
Used to bond cylindrical fitting parts, particularly where bond
gaps can approach 0.25mm (0.01") and where maximum
strength at room temperature is required. Applications include
locking bushings and sleeves into housings and on shafts.
PROPERTIES OF UNCURED MATERIAL
Typical
Value
Chemical Type
Urethane methacrylate
Appearance
Green, fluorescent liquid
1.09
Specific Gravity @ 25擄C
Viscosity @ 25擄C, mPa.s (cP)
Brookfield RVT
Spindle 3 @ 20 rpm
2,500
DIN 54453, MV
2,250
D = 129 s
-1
after t=180secs
>93
Flash Point (TCC),
擄C
Range
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.
% of Full Strength on steel
100
40擄C
75
22擄C
5 擄C
50
25
0
5min 10min
30min 1hr
3hr
6hr
24hr
72hr
Cure Time, Hours
1,800 to 3,300
1,500 to 3,000
% of Full Strength on steel
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.
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.
100
75
No Activator
% of Full Strength on steel
100
50
Act T
Act N
75
50
Steel
25
Zinc Dichromate
25
0
5min 10min
30min 1hr
3hr
6hr
24hr
72hr
Aluminium
Cure Time, Hours
TYPICAL PROPERTIES OF CURED MATERIAL
0
5min10min
30min 1hr
3hr
6hr
24hr
72hr
Physical Properties
1
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.
% of Full Strength on steel
100
Coefficient of thermal expansion, ASTM D696, K
-1
Coefficient of thermal conductivity, ASTM C177, W.m
-1
K
-
80 x 10
-6
0.1
0.3
Specific Heat , kJ.kg
-1
K
-1
PERFORMANCE OF CURED MATERIAL
(After 24 hr at 22擄C on steel)
Typical
Shear Strength, ISO 10123, N/mm虜
(psi)
Shear Strength, DIN 54452, N/mm虜
(psi)
Value
31
(4500)
27.5
(4000)
Range
22 to 40
(3200 to 5900)
20 to 35
(2900 to 5000)
75
0.15mm
50
0.05mm
25
0
5min10min
30min 1hr
3hr
0.25mm
6hr
24hr
72hr
Cure Time, Hours
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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