General remarks
Check that parts A and B are matched and are marked with the same batch number.
Before using BLUESIL FR 1593 A&B FOAM, Parts A and B must be thoroughly mixed.

1. In the case of manual processing, parts A and B must be mixed for 15 seconds before pouring.
We recommend that a mixer with a blade diameter approximately equal to that of the container should be used. A uniform and fine cell structure depends on the mixing speed: the higher the speed, the better the final results.
Expansion begins within 60 seconds after mixing parts A and B of BLUESIL FR 1593 A&B FOAM and continues for about 60 to 90 seconds. Curing is complete in less than 10 minutes.
If curing conditions prevent the mixture from expanding freely, the final foam is denser, and density can reach or exceed 500 kg/m3.
The temperature at which the components are mixed greatly affects the speed at which the foam forms: this is slow at 5°C (about 15 min), whereas it forms in less than a minute above 30°C .

2. For processing large quantities or performing several operations in succession, a special mixing, pumping and dispensing equipment is required, suited to the reactivity of the product.
These machines generally have two tanks of identical capacity and a dynamic mixing head, capable of injecting air, if necessary, to make cellularisation more uniform or to reduce the bulk density of the foam.

Cellularisation at low temperature: accelerator
The use of BLUESIL ACC PA 39 makes it possible to operate at a lower temperature without affecting the general behaviour of the cured product. The accelerator must be mixed with part A. It does not affect the fire resistance of the cured material.

Foaming time (seconds)Specific gravityRemarks
​Reference at 23°C​145​0.30​Fine, uniform cells

​Reference at 5°C

​280​0.31​Medium and coarse cells
​1% of accelerator PA 39
added to FR at  5°C
​125​0.29​Fine, uniform cells


Tolerance on the proportions of A and B
The influence of the Part A / Part B ratio on the foam properties was studied over the maximum possible range: 10/90 to 80/20.
The result is always a foam: its colour varying from very light grey to intense black.
By passing from A/B = 10/90 to 80/20, the flexibility changes from very rigid to very soft. Cells dimension changes from very small to large, so that even a large discrepancy in machine setting will not stop the cellularisation of the product. The density decreases.

Note: In order to facilitate the nuclear decontamination of penetrations sealed with BLUESIL FR 1593 A&B FOAM, the exposed surface can be protected with BLUESIL FR thin coat of . to is generally sufficient and does not affect the fire rating of BLUESIL FR 1593 A&B FOAM (M 3).
This method will also reinforce the water tightness of the sealed penetrations.


Certain materials may inhibit curing of BLUESIL FR 1593 A&B FOAM:

  • natural or synthetic rubber containing sulphur derivatives,
  • RTV silicones catalyzed with metallic salts,
  • PVC stabilised with tin salts,
  • epoxides catalysed with amines.

In case of doubt, it is recommended to test by applying some of the two component mixture to a small part of the object.
Handling precaution: Immediately upon mixing BLUESIL FR 1593 A&B FOAM a chemical reaction takes place that results in the evolution of flammable hydrogen gas.


BLUESIL FR 1593 B FOAM may be stored at temperatures between 0°C / 32°F and 30°C / 86°F for up to 32 months from its date of manufacturing.Please consult the Safety Data Sheet of this product.


BLUESIL FR 1593 A&B FOAM is a two-component elastomer which cures at room temperature: When the two components are mixed together it expands into a closed cell flexible fire resistant foam.
The two components - A and B - are of two different colours, black and beige, to enable easy mixing. After cross-linking the foam expands to 3-4 times its initial volume. This is an exothermic reaction.

Optical Encapsulant;Optical Transparency;Protection;UV resistant

2 Part RTV

BLUESIL FR 1593 A&B FOAM is specially developed to act as a fire barrier. Part A and B are mixed together and applied in its liquid state after which it quickly expands into a foam. It is therefore particularly suitable for sealing penetrations which are difficult to access. It is also suitable for complex systems such as fire-resistant partitions with conduits and service cables running through them.
In case of a fire, the foam-exposed side becomes a solid slag which prevents the fire from spreading. Beneath this surface, the foam remains flexible and forms a barrier against flames and combustible materials. It also thermally insulates the unexposed side against the heat.
Main areas of use are in the construction sector, nuclear power stations, naval and offshore applications. This can be further extended since silicones retain their properties in a very wide temperature range, and fillers such as fibres or lead could be added to modify the foam to make it suitable for specific applications.
BLUESIL FR 1593 A&B FOAM does not require any maintenance. In case of damage or where service conduits or cables need replacing, simply cut out the old cured foam and re-apply with a new batch of BLUESIL FR 1593 A&B FOAM.

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




Viscosity1500PairedCompNF T 76102mPa.s









foaming-time_f4025daf-c43a-467c-b0f1-69294ab858c6foaming-time_f4025daf-c43a-467c-b0f1-69294ab858c6Foaming time105 PairedMixs
foamed-density_7b5a4afe-67ec-4a10-a77c-87a67f70aef4foamed-density_7b5a4afe-67ec-4a10-a77c-87a67f70aef4Foamed density270PairedMixkg/m3





BLUESIL FR 1593 A FOAMBLUESIL FR 1593 A FOAM/our_offer/Product/90007465/90001086/BLUESIL-FR-1593-A-FOAM