Maxtech SI8603 High transparency liquid optical silicone gel
∎Product Description
SI8603 is two-component, silicone elastomer which can cure at room temperature by a poly-addition reaction. This reaction can be accelerated by heat.
∎Key Features
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Easy processing and curing
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Middle viscosity, easily mixing as 1:1 by weight or by volume.
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Excellent transparency
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High stability to ozone and ultraviolet light
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High temperature stability
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High stability and flexibility at low temperatures
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Outstanding resistance to aging and weathering
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Low hardness, soft and flexible

Optically Clear Silicone Materials

rain light sensor gel

silicone gel glue adhesive for waterproof junction box

Optically Clear Silicone Materials
∎Typical Applications
●Provide a glassy clear appearance to parts manufactured using it. The rubber is an excellent candidate to consider for cost-efficient
manufacture of highly transparent optical parts, with very low modulus.
●Rain-light sensors, camera systems, optical sensors.
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∎Technical Data Table
PROPERTY STANDARD/UNITS VALUE of SI8603
---- ---- PART A PART B
Material ---- Polysiloxane Hydrogen polysiloxane
Color Visual inspection Colorless Liquid Colorless Liquid
Viscosity 25°C, cps 6000 6000
Density 25°C, g/cm3 0.99 0.99
Mixture/mass ratio ---- A:B=100:100
Viscosity of mixture 25°C, cps 6000
Operation time 25°C, min 30
Cure condition ---- 25℃,2hours or 80℃, 30min,120℃, 15min
Cured appearance ---- Transparent gel
Hardness Shore00 60
Tensile Strength Mpa 0.7
Tear Strength Mpa 3
Elongation % 100
Refractive Index 23°C, 460nm 1.45
Transparency Index Thickness 2mm, % 92
Application temperature °C -60~260
Note:All above data were tested under standardized conditions or tested by further experiments.
How to use ?
Remix each of the two components (part A and B) every time before using.
● Mixing of the two components
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Add 100 parts A to 100 parts B.
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The two components may be intimately mixed either by hand or using a low-speed electric or pneumatic mixer to minimize the introduction of air into the mixture.
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The viscosity of part A and B can be reduce using Maxtech 2300, add 5 to 10% of the quantity of SI8603. This will make no significant change to the mechanical properties after polymerization. Up to 30% of Maxtech 2300 can be added without causing exudation.
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● Degassing
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After mixing base and catalyst, it is recommended to eliminate entrapped air.
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If the processing is done with the help of a machine both parts are degassed before mixing.
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The SI8603 A&B is degassed under a vacuum of 30 to 50 mbar. Under vacuum, the product expands 3 at 4 times its initial volume and forms bubbles on its surface. These bubbles will disappear gradually and the mixture will sink back down to its initial volume. Wait a few minutes to ensure complete degassing and then release the vacuum. The product is ready for use.
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Remark: release the vacuum several times improves the degassing.
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For easier degassing only fill a recipient to 1/3 of its height.
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The product can be poured by gravity or under pressure. SI8603 A and B is easier to use than normal RTV because the viscosity of the two components Increases relatively slowly.
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● Cross-linking
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At 23°C, the moulds can be demoulded after 24h. In order to achieve the best possible performance levels from the moulds it is preferable to wait for 24 h before using them.
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If the accelerated cure is desired, mild heat should be preferred. Conversely at lower temperature polymerization is much slower, at 20°C 36h may be necessary to complete cross-linking.
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Be aware that contact with certain materials can inhibit the curing of this RTV:
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Natural rubbers vulcanized with sulphur
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Polycondensation RTV catalyzed with metal salts
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PVC stabilizing
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gents Amine cured
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epoxies Sulphur
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containing clays.
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In case of doubts, it is recommended to test the substrate by applying a small quantity
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of the mixed silicone on a restricted area. Take note that cross contaminates due to improperly cleaned tools or devices are a most frequent cause for inhibition