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

1. Mixing of the two components
For each product, mix the two parts BLUESIL RTV A and BLUESIL RTV B according to the mix ratio A : B = 10 : 1. In the case of BLUESIL RTV 3131 A&B and RTV 3132 A&B, because of their short working time it is recommended to mix and dispense the product by means of a static mixer, after degassing the two parts separately (see § 2. Degassing below). For BLUESIL RTV 3130 A&B and RTV 3131 SC A&B, the two components may be intimately mixed either by hand or by means of a low-speed electric or pneumatic mixer to minimize the introduction of air into the mixture.

2. Degassing
After mixing of A- and B- part of any of the four grades, it is recommended to eliminate entrapped air: if the mixing is done with the help of a machine and a static mixer, like recommended for BLUESIL RTV 3131 A&B and RTV 3132 A&B, both parts are degassed before mixing. When A- and B- part are manually mixed, like for BLUESIL RTV 3130 A&B or RTV 3131 SC A&B, the degassing of the mixed product occurs under a vacuum of 30 to 50 mbar. Under vacuum, the product expands 3 to 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 within 5 minutes. Release the vacuum and repeat the operation a few minutes later. The same applies also for the degassing of the two separated parts.
Remark: release the vacuum several times improves the degassing. For easier degassing only fill a recipient to 1/3 of its height.

3. Crosslinking
The best curing conditions are at 23°C. When using the products at higher temperatures, the pot life is shorter and the setting rate faster. As opposed to this, lower temperatures increase the pot life and decrease the setting rate. Room temperature curing assures the lowest possible shrinkage, if accelerated cure is desired, mild heat should be preferred. To minimize shrinkage the elastomer should be cured at maximum temperature of 60°C, higher temperatures might cause higher shrinkage. At 23°C, the cured silicone can be demoulded after the time indicated as "demolding time" (see § 2.Polymerization, pag.1). In order to achieve the best possible performance level from the pads, it is preferable to wait for 24 hours before using them.

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

  • Sulphur and its derivatives (e.g. sulphur containing clays; natural rubbers vulcanized with sulphur)
  • Ammonia and amines (e.g. amine cured epoxies, epoxy curing agents)
  • Chlorides
  • Polycondensation RTV catalysed with metal salts
  • PVC stabilizing agents
  • Silver salts

If doubts exist it is recommendable to run a quick test with a small quantity of material in order to assess compatibility. Take duly note that cross contamination due to not well cleaned tools or devices is frequently the main cause of inhibition. The best way is to use only dedicated gear when processing polyaddition RTVs and not to exchange drum covers.

4. Processing aids
4.1 Adhesion promoters ("primers")
In order to achieve adhesion of BLUESIL RTV 3130 A&B, RTV 3131 A&B, RTV 3131 SC A&B or RTV 3132 A&B on the pad support, it is recommended to prime the support with an adhesion promoter. Bluestar Silicones recommends the use of both primers BLUESIL PRIM PM 820 and BLUESIL PRIM PM 811 A&B according to the instructions next page.

BLUESIL PRIM PM 820

BLUESIL PRIM PM 811 A&B

Substrate

Metal (steel, aluminum), plastic (polyester), reinforced resins

Metal (steel, aluminum), plastic (polyester), reinforced resins

Pot-life A+B

n.a. (monocomponent)

> 3 days

Usage level

​Very thin layer (30÷60 g/m2)

​Very thin layer (30÷60 g/m2)

Use guideline

1. Application of PM 820

2. Wait 30 minutes

3. Application of PM 811

4. Wait 30 minutes up to 7 days

5. Application of RTV-2 Silicone

1. Application of PM 820

2. Wait 30 minutes

3. Application of PM 811

4. Wait 30 minutes up to 7 days

5. Application of RTV-2 Silicone

Application by

​Spray, brush, cloth

​Spray, brush, cloth

For more detailed information, please refer to the Technical Data Sheet of the primers.

4.2 Crosslinking accelerator / retardant
Should it be desired to change the polymerization time of BLUESIL RTV 3130 A&B, BLUESIL RTV 3131 A&B, BLUESIL RTV 3131 SC A&B and BLUESIL RTV 3132 A&B products, following additives allow a customization by increasing the pot-life (Retarder BLUESIL RTRD PA 40) or by shortening it (Accelerator BLUESIL ACC PA 39). Information on their use are shown in the table below.

 

BLUESIL ACC PA 39

BLUESIL RTRD PA 40

Usage level

0.1 ÷ 5 %

0.1 ÷ 1 %

​Use

Mix PA39 into Pt catalyst part

Mix PA40 into base part

Suggested for

RTV 3130, RTV 3131 SC

RTV 3131, RTV 3132

As an indication, the effects of the two additives on the pot-life are shown in the graphs next page.

4.3 Oil dilution
The hardness of BLUESIL RTV 3130 A&B, RTV 3131 A&B, RTV 3131 SC A&B and RTV 3132 A&B can be adjusted by means of a non reactive silicone oil, that plasticizing the silicone network lowers the material hardness. Bluestar Silicones offers the low viscosity silicone oil BLUESIL FLD 47V50, that can be added to the BLUESIL RTV A&B products as schematically shown in the graph next page.


 

STORAGE t < +40°C IN ITS ORIGINAL PACKStore in a cool, dry place with adequate ventilation. Keep away from incompatible materials, open flames, and high temperatures. Store in tightly closed original container. Suitable containers: polyethylene. Steel drums coated with epoxy-resin.Please consult the Safety Data Sheet of this product.

BLUESIL RTV 3131 A SC

The BLUESIL RTV 3130 A&B, RTV 3131 A&B, RTV 3131 A&B SC and RTV 3132 A&B are two component silicone elastomers which cure at room temperature by a polyaddition reaction. This reaction can be accelerated by heat.

Release

2 Part RTV

Fluid

•High purity products particularly designed for printing pads production

•Outstanding mechanical properties

•Excellent solvent resistance

•Adjustable hardness by diluting with silicone oils

•Antistatic properties for BLUESIL RTV 3132

•Possibility to choose between longer (BLUESIL RTV 3130 and 3131 SC) or shorter

working time (BLUESIL RTV 3131)

•Customizable pads color with BLUESIL RTV 3131 or RTV 3131 SC.

  • These products are specifically formulated for the production of printing pads.

 

Asia Pacific;Europe Middle East Africa;Central and South America;North America

For information about Storage and Shelf Life for this product, please download the Technical Data Sheet.

 Characteristics_A

 

 

ColorColorlessPairedComp
Viscosity25000PairedCompRH 0174mPa.s

 Characteristics_B

 

 

ColorColorlessPairedComp
Viscosity15000PairedCompRH 0174mPa.s

 

 

 Table_Characteristics_A_And_B

 

 

hardness_cd523e03-72a3-4261-93f9-36f7bbeeafb1hardness_cd523e03-72a3-4261-93f9-36f7bbeeafb1Hardness30PairedMixRH 0110sh.A
pot-life_0d649a54-7503-4c7c-a047-9d0c4b3e9f6apot-life_0d649a54-7503-4c7c-a047-9d0c4b3e9f6aPot life60PairedMixRH 0114min

 

 

 

 

BLUESIL RTV 3131 B SCBLUESIL RTV 3131 B SC/our_offer/Product/90059329/90059330/BLUESIL-RTV-3131-B-SC

 

 

 

 

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