RTV Silicone Rubber

1. Properties:

2. Main Applications:

3. Specification:                                                                          back to top

  Brand

GD-401

GD-402

GD-404

GD-406

GD-407

GD-414

Appearance

Fluid

Paste

Fluid

White fluid

Paste

White fluid

White, red black paste

Surface solidifying time  (min.)

30~180

30~180

15~60

15~60

<= 200

<= 240

10~70

Hardness (Shore A)

=> 25

=> 30

=> 25

=> 30 

-----

-----

-----

Tensile strength at break  MPa

=> 0.59

=> 0.98

=> 0.69

=> 1.86

-----

=> 1.96

=>3.92 

Elongation at break %

=> 200

=> 200

=> 200

=> 250

-----

=> 200

=> 300

Dielectric coefficient  106Hz  F/m

<= 3.2

<= 3.5

<= 3.2

<= 3.5

3.0~ 3.5

<= 3.5

-----

  Brand

GD-401

GD-402

GD-404

GD-406

GD-407

GD-414

Dielectric loss tangent 106Hz

<= 5X10-3

<= 5X10-2

<= 5X10-3

<= 5X10-2

<= 5X10-3

<= 5X10-3

-----

Volume resistance Ohm-cm

=>1X1013

=>1X1013

=>1X1013

=>1X1013

=>1X1014

=>1X1014

-----

Puncture strength MV/m

=> 12

=> 10

=> 15

=> 15

=> 15

=> 15

=> 15

Shearing strength MPa 

-----

-----

-----

-----

=> 0.78

=> 1.47

=> 1.47

Tearing strength N/m

-----

-----

-----

-----

-----

-----

=> 1.18X104

Note:" <= " means no more than ,  "=>" means no less than

  

4. How to use:                                                                            back to top

  1. Directly extrude the paste or fluids out of the soft tube. Curing take place as soon as the paste touch the moisture in the air, but they become elastomer by degree from outside to inside and solidifying time is directly proportionate to thickness of the rubber.

  2.  
         ( Temperature 20oC~30oC, Relative humidity 60~80%.)

    Solidifying Time  (hr) 

    Thickness

    GD-401

    GD-402

    GD-404

    GD-405

    GD-406

    0.5~1 mm

    1~2

    1~3

    0.5~1

    0.5~1

    2.5~4

    1~2 mm

    2~4

    2~4

    1~2

    1~2

    -----

    2~3 mm

    4~10

    5~10

    3~6

    3~6

    -----

    3~4 mm

    10~20

    15~20

    6~14

    6~14

    3~6

    7~9 mm

    ~48

     ~48

    40~48

    40~48

    -----

    10~11 mm

    ~72

    ~72

    48~60

    48~60

    -----

  3.  Curing will fail if the work-piece is sealed up as soon as it is applied paste, so the silicone rubber must be exposed to air for a relative long time to cure thick rubber sheet.
  4. Curing by stage can be employed if fast deep cure is needed(spread the paste small in quality one time, repeat the process after previous spreading rubber solidified thoroughly until reaching required thickness).
  5. Adding 5~20 parts MgO into 100 parts GD-404,GD-405 can make deep cure and eliminate erosion of the by products(extrude the paste into beaker, put into MgO, stir till well distributed).
  6. If working temperature higher than 150oC and the rubber layer relatively thick or the work-piece is air-tight, the giving off low molecular weight by products are not admitted, three stage curing process can be employed: Dry at temperature, treat at 40íŠ~50íŠ in a oven of relative humidity 90%,then,dry at 180íŠ~200íŠ to fulfill cure, remove low molecular weight by products and improve the propertied of the rubber.
  7. As packing and adhesive materials, the work-piece should be clean and dry. As packing material, lay the work-piece aside for certain time before use. As adhesion, first apply the paste to work-piece, lay aside for a little while to let the rubber layer absorb some moisture, finally, put the two waiting-for-adhering surfaces together and lay aside for 24 hours.

Notes:                                                                                                               back to top

  1. These silicone rubbers are cured by moisture in air and emit low molecular weight materials, raising temperature and increasing relative humidity would accelerate the curing process.
  2. As the volume coefficient of expansion(6~8X10-4/ oC) is much larger than that of metal, it must be took into consideration when using at high temperature.

5. Packing, Storage and Transportation:


 
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