AS1803 total pages 3 page 1
AS1803
Characterization This is a non-corrosive, neutral cure 1 component RTV silicone adhesive
sealant. It is one in a range of acetone cure products which are solvent-free.
It exhibits excellent primerless adhesion to many substrates and cures at
room temperature when in contact with atmospheric moisture to form a tough
rubber. This product will not corrode copper or its alloys and is suitable fo
r
use with electronic components
Technical Data
AS1803
Viscosity
35,000
mPa.s
Mixture
Cure Type
Acetone
FDA
No CFR (21] 177.2600
Max Cure at 25°C
8 h
Rheology
Self-leveling
Self-bonding
Yes
Tack Free Time
4 min
Colour
White
Cured product
V
ulcanisate after 7 days at 23°C +/-
2°C and 50% +/-5% humidity
CTE Linear
198 ppm/°C
CTE Volumetric
475 ppm/°C
Duro Shore A
65 ASTM D 2240-95
Working Temp.
-50 - 220 °C AFS_1540B
Tensile
2.8 MPa ISO 37
Elongation
94 % ISO 37
Linear Shrinkage
1 %
SG
2.24 BS ISO 2781
Thermal Conductivity
1.55 W/m*K
UL 94V-0
Yes ppm
AS1803 total pages 3 page 2
Electrical properties
Dielectric Constant
4.9 1kHz ASTM D-150
Dielectric Strenght
20 kV/mm ASTM D-149
Dissipation Factor
0.009 1kHz ASTM D-150
Volume Resistivity
1E+14 Ohm*cm ASTM D-257
Adhesion testing
Lap Shear Aluminium
6 kg/cm² ASTM D1002
Lap Shear Copper
3 kg/cm² ASTM D1002
Lap Shear Stainless
Steel
2.6 kg/cm² ASTM D1002
Storability / Storage
With a proper storage the product will hold for approx. 9 months max. at 40°C and protected from frost in a dry
place in closed original containers.
Properties
-Good thermal conductivity
-Non-corrosive
-Fast skinning
-Low linear shrinkage
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
This product is a ready for use 1 component system. If supplied in cartridges, it can be applied using either manual
or pneumatic dosing guns. It can also be applied from bulk containers using conventional drum dosing 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 – 30 °C and 40 - 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 dosing of 310 ml cartridges, the recommended pressure is 2.25 to 3.45 bar (40 to 50 psi). Dosing
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.