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BLUESIL RTV 3420 B may be stored for up to 12 months from its date of manufacturing.Please consult the Safety Data Sheet of this product.

BLUESIL RTV 3420 B

Bluesil™ RTV 3420 A & B is a two component, silicone system which cures at room temperature by a polyaddition reaction (10:1 ratio) resulting in a soft silicone elastomer.

Release

2 Part RTV

  • ​Excellent detail reproduction
  • Long durability due to easy demolding
  • Excellent mechanical strength – low modulus and high elongation
  • Low linear shrinkage
  • Colorless
  • No release of toxic substances during or after curing
  • No need for a 'break-in' period of concrete casting

Production of flexible molds with excellent detail reproduction and outstanding mechanical properties, resulting in longer mold use life.

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

 Characteristics_A

 

 

 Characteristics_B

 

 

 

 

 Table_Characteristics_A_And_B

 

 

 

 

 

 

BLUESIL RTV 3420 ABLUESIL RTV 3420 A/our_offer/Product/90062258/90062260/BLUESIL-RTV-3420-A

 

 

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

1. Mixing of the two components

Add 100 parts of Bluesil™ RTV 3420 A to 10 parts of Bluesil™ RTV 3420 B, by weight or by volume. 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.

2. Degassing

After mixing Bluesil™ RTV 3420 A&B, it is strongly recommended to eliminate entrapped air. If the processing is done with the help of a machine and a static mixer, the two parts are degassed separately before mixing.

The Bluesil™ RTV 3420 A&B is degassed under a vacuum of 25 – 29" Hg. 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 collapse to its initial volume within few minutes.  Continue vacuum for 1 – 2 additional minutes, the release the vacuum.

Note:  bumping / burping (quick release) the vacuum several times will accelerate the complete degassing process. For easier degassing only fill a recipient to 1/3 of its height.

Molds obtained without degassing the mixed A and B parts can contain voids (entrapped air bubbles) that are potential areas for failure of the mold during repeated usage.  Following the degassing instructions above is a preferred method to maximize mold duration.

 

3. Cross linking

The best curing conditions are at 23°C. The use of the product at higher temperatures will reduce the pot life and increase the setting rate. As opposed to this, lower temperatures will increase the pot life and decrease the setting time.  Temperatures below 18°C, the product may not fully cure after 16 – 24 hours.  The mold will have to be exposed to higher temperature to finish curing the mold.

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 levels from the molds, it is preferable to wait for 24 hours before using them.

Room temperature curing assures the lowest possible shrinkage, if accelerated cure is desired, mild heat should be preferred. To minimize shrinkage, cure the elastomer at maximum temperature of 60°C for 3-4 hours, higher temperatures will cause higher shrinkage.

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

The above list is not considered a complete list of incompatible materials.  If unsure of the compatibility, it is recommended to perform a small patch test with mixed material on any materials that are not known to be compatible.  Additionally, insure that all tools to be used are thoroughly cleaned of any potential contaminating materials.  Ideally, all tools would be dedicated to the silicone system. 

4. Dimensional stability of the crosslinked product

Once crosslinked, Bluesil™ RTV 3420 is a silicone elastomer which, as all materials and especially elastomers, undergoes thermal expansion and contraction.  The thermal expansion coefficient of the product is approximately αV = 5.10-4/°C (volumetric) or αL = 1,7.10-4/°C (linear).

​Mix each of the two components (parts A and B) every time before using. 1. Mixing of the two components Add 100 parts of Bluesil™ RTV 3420 A to 10 parts of Bluesil™ RTV 3420 B, by weight or by volume. 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. 2. Degassing After mixing Bluesil™ RTV 3420 A&B, it is strongly recommended to eliminate entrapped air. If the processing is done with the help of a machine and a static mixer, the two parts are degassed separately before mixing. The Bluesil™ RTV 3420 A&B is degassed under a vacuum of 25 – 29" Hg. 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 collapse to its initial volume within few minutes. Continue vacuum for 1 – 2 additional minutes, the release the vacuum. Note bumping / burping (quick release) the vacuum several times will accelerate the complete degassing process. For easier degassing only fill a recipient to 1/3 of its height. Molds obtained without degassing the mixed A and B parts can contain voids (entrapped air bubbles) that are potential areas for failure of the mold during repeated usage. Following the degassing instructions above is a preferred method to maximize mold duration. 3. Cross linking The best curing conditions are at 23°C. The use of the product at higher temperatures will reduce the pot life and increase the setting rate. As opposed to this, lower temperatures will increase the pot life and decrease the setting time. Temperatures below 18°C, the product may not fully cure after 16 – 24 hours. The mold will have to be exposed to higher temperature to finish curing the mold. 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 levels from the molds, it is preferable to wait for 24 hours before using them. Room temperature curing assures the lowest possible shrinkage, if accelerated cure is desired, mild heat should be preferred. To minimize shrinkage, cure the elastomer at maximum temperature of 60°C for 3-4 hours, higher temperatures will cause higher shrinkage. 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 The above list is not considered a complete list of incompatible materials. If unsure of the compatibility, it is recommended to perform a small patch test with mixed material on any materials that are not known to be compatible. Additionally, insure that all tools to be used are thoroughly cleaned of any potential contaminating materials. Ideally, all tools would be dedicated to the silicone system. 4. Dimensional stability of the crosslinked product Once crosslinked, Bluesil™ RTV 3420 is a silicone elastomer which, as all materials and especially elastomers, undergoes thermal expansion and contraction. The thermal expansion coefficient of the product is approximately αV = 5.10-4/°C (volumetric) or αL = 1,7.10-4/°C (linear).

 

 

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

1. Mixing of the two components

Add 100 parts of Bluesil™ RTV 3420 A to 10 parts of Bluesil™ RTV 3420 B, by weight or by volume. 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.

2. Degassing

After mixing Bluesil™ RTV 3420 A&B, it is strongly recommended to eliminate entrapped air. If the processing is done with the help of a machine and a static mixer, the two parts are degassed separately before mixing.

The Bluesil™ RTV 3420 A&B is degassed under a vacuum of 25 – 29" Hg. 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 collapse to its initial volume within few minutes.  Continue vacuum for 1 – 2 additional minutes, the release the vacuum.

Note:  bumping / burping (quick release) the vacuum several times will accelerate the complete degassing process. For easier degassing only fill a recipient to 1/3 of its height.

Molds obtained without degassing the mixed A and B parts can contain voids (entrapped air bubbles) that are potential areas for failure of the mold during repeated usage.  Following the degassing instructions above is a preferred method to maximize mold duration.

 

3. Cross linking

The best curing conditions are at 23°C. The use of the product at higher temperatures will reduce the pot life and increase the setting rate. As opposed to this, lower temperatures will increase the pot life and decrease the setting time.  Temperatures below 18°C, the product may not fully cure after 16 – 24 hours.  The mold will have to be exposed to higher temperature to finish curing the mold.

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 levels from the molds, it is preferable to wait for 24 hours before using them.

Room temperature curing assures the lowest possible shrinkage, if accelerated cure is desired, mild heat should be preferred. To minimize shrinkage, cure the elastomer at maximum temperature of 60°C for 3-4 hours, higher temperatures will cause higher shrinkage.

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

The above list is not considered a complete list of incompatible materials.  If unsure of the compatibility, it is recommended to perform a small patch test with mixed material on any materials that are not known to be compatible.  Additionally, insure that all tools to be used are thoroughly cleaned of any potential contaminating materials.  Ideally, all tools would be dedicated to the silicone system. 

4. Dimensional stability of the crosslinked product

Once crosslinked, Bluesil™ RTV 3420 is a silicone elastomer which, as all materials and especially elastomers, undergoes thermal expansion and contraction.  The thermal expansion coefficient of the product is approximately αV = 5.10-4/°C (volumetric) or αL = 1,7.10-4/°C (linear).

​Mix each of the two components (parts A and B) every time before using. 1. Mixing of the two components Add 100 parts of Bluesil™ RTV 3420 A to 10 parts of Bluesil™ RTV 3420 B, by weight or by volume. 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. 2. Degassing After mixing Bluesil™ RTV 3420 A&B, it is strongly recommended to eliminate entrapped air. If the processing is done with the help of a machine and a static mixer, the two parts are degassed separately before mixing. The Bluesil™ RTV 3420 A&B is degassed under a vacuum of 25 – 29" Hg. 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 collapse to its initial volume within few minutes. Continue vacuum for 1 – 2 additional minutes, the release the vacuum. Note bumping / burping (quick release) the vacuum several times will accelerate the complete degassing process. For easier degassing only fill a recipient to 1/3 of its height. Molds obtained without degassing the mixed A and B parts can contain voids (entrapped air bubbles) that are potential areas for failure of the mold during repeated usage. Following the degassing instructions above is a preferred method to maximize mold duration. 3. Cross linking The best curing conditions are at 23°C. The use of the product at higher temperatures will reduce the pot life and increase the setting rate. As opposed to this, lower temperatures will increase the pot life and decrease the setting time. Temperatures below 18°C, the product may not fully cure after 16 – 24 hours. The mold will have to be exposed to higher temperature to finish curing the mold. 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 levels from the molds, it is preferable to wait for 24 hours before using them. Room temperature curing assures the lowest possible shrinkage, if accelerated cure is desired, mild heat should be preferred. To minimize shrinkage, cure the elastomer at maximum temperature of 60°C for 3-4 hours, higher temperatures will cause higher shrinkage. 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 The above list is not considered a complete list of incompatible materials. If unsure of the compatibility, it is recommended to perform a small patch test with mixed material on any materials that are not known to be compatible. Additionally, insure that all tools to be used are thoroughly cleaned of any potential contaminating materials. Ideally, all tools would be dedicated to the silicone system. 4. Dimensional stability of the crosslinked product Once crosslinked, Bluesil™ RTV 3420 is a silicone elastomer which, as all materials and especially elastomers, undergoes thermal expansion and contraction. The thermal expansion coefficient of the product is approximately αV = 5.10-4/°C (volumetric) or αL = 1,7.10-4/°C (linear).

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