AS1504 total pages 3 page 1
AS1504
Characterization
A
S1504 is a 1-part, RTV silicone adhesive sealant. It is one in a range o
f
A
cetox
y
cure products which are solvent-free. During cure, it liberates a very
small amount of acetic acid, giving rise to the familiar ��vinegar´odour which
quickly dissipates after cure. It exhibits good primerless adhesion to many
substrates and cures rapidly at room temperature when in contact with
atmospheric moisture. This product is not to be recommended for use with
copper and its associated alloys or in electronic assemblies.
Key Features:
-Flexible form -50 to +300°C
-Good electrical insulation properties
-Excellent adhesion to most substrates
Technical Data
AS1504
Mixture
Cure Type
Acetoxy
FDA
No CFR (21] 177.2600
Max Cure @ 25°C
7 h
Rheology
Paste
Extrusion Rate
255 g/min
Self Bonding
Yes
Tack Free Time
4 min
Colour
Red
Cured product
After 7 days cure at 23°C +/- 2°C and
50% +/-5% humidity
CTE Linear
294 ppm/°C
CTE Volumetric
882 ppm/°C
Duro Shore A
35 ASTM D 2240-95
Working Temp.
-50 - 300 °C AFS_1540B
Tensile
2.5 MPa ISO 37
Elongation
410 % ISO 37
Modulus Youngs
0.71 MPa
Modulus @ 100% Strain
0.98 MPa
Tear
6.3 kN/m
Linear Shrinkage
0.8 %
AS1504 total pages 3 page 2
SG
1.09 BS ISO 2781
Thermal Conductivity
0.2 W/m*K]
UL 94V-0
No ppm]
Electrical properties
Dielectric Constant
2.68 1kHz ASTM D-150
Dielectric Strenght
>18 kV/mm ASTM D-149
Dissipation Factor
0.002 1kHz ASTM D-150
Surface Resistivity
4.04E+14 Ohm ASTM D-257
Volume Resistivity
3.95E+15 Ohms*cm ASTM D-257
Adhesion testing
Lap Shear 304 kg/cm²
Stainless Steel
5 kg/cm
2
ASTM D1002
Storability / Storage
With a proper storage the product will hold for approx. 24 months if stored max. at 40°C and protected from frost
in a dry place in closed original containers.
The above given values are product describing data. Please consult the ‘delivery specification’ for binding product specifications.
Further data about product properties, toxicological, ecological data as well as data relevant to safety can be found in the safety
data sheet.
Application Technique
Processing
AS1504 is a ready for use 1 part system. If supplied in cartridges it can be applied using either manual or pneumatic
dispensing guns. It can also be applied from bulk containers using conventional drum dispensing equipment.
All surfaces to which the sealant is to be applied should be clean, dry and free from grease, dirt, and loose material.
Priming of surfaces is not normally required. If using the product as an adhesive, it should be applied to one clean
surface and the other clean surface brought into contact with it within the tack-free time stated above. For optimum
bond strength, the thickness of the sealant joint should be at least 1 mm.
The sealant will cure upon exposure to atmospheric moisture, ideally between 20 to 30°C and 40% to 70% Relative
Humidity.Time taken for cure will depend on the thickness of the joint, humidity and temperature. Joints should be
left undisturbed for at least 24 hours, but preferably longer to effect sufficient depth of cure. Full cure requires 7
days.
For pneumatic dispensing of 310 ml cartridges, the recommended pressure is 2.25 to 3.45 bar (40 to 50 psi).
Dispensing pressure above the recommended limits may lead to gas bypassing the piston, causing spluttering at
the nozzle and poor bead quality.
It is absolutely important to check the compatibility in preliminary tests if unknown substrates are used.