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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.

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∎Key Features

  1. Easy processing and curing

  2. Middle viscosity, easily mixing as 1:1 by weight or by volume.

  3.  Excellent transparency

  4.  High stability to ozone and ultraviolet light

  5.  High temperature stability

  6.  High stability and flexibility at low temperatures

  7. Outstanding resistance to aging and weathering

  8.  Low hardness, soft and flexible

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∎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 ?
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Remix each of the two components (part A and B) every time before using.

● Mixing of the two components

  1. Add 100 parts A to 100 parts B.

  2. 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. 

  3. 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.

  4. ● Degassing

  5. After mixing base and catalyst, it is recommended to eliminate entrapped air.

  6. If the processing is done with the help of a machine both parts are degassed before mixing.

  7. 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.

  8. Remark:  release the vacuum several times improves the degassing.  

  9. For easier degassing only fill a recipient to 1/3 of its height.

  10. 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.

  11. ●  Cross-linking

  12. 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.

  13. 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.

  14. Be aware that contact with certain materials can inhibit the curing of this RTV:  

  15. Natural rubbers vulcanized with sulphur

  16. Polycondensation RTV catalyzed with metal salts

  17. PVC stabilizing

  18. gents Amine cured

  19. epoxies Sulphur

  20. containing clays.

  21. In case of doubts, it is recommended to test the substrate by applying a small quantity

  22. 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

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