Silicones, Inc. is constantly developing products for new applications, improving our existing products and researching new technologies that might be useful for silicones.  The nomenclature we use is XT for experimental tin catalyzed products and XP for experimental platinum catalyzed products.  Some of the experimental products become standard grades, e.g., GI-245, GI-298 and GI-384 all began as experimental products that were developed for a specific application.  Some recent product developments are shown below:

XP-149 – Optically clear, fast-curing, 10:1 mix ratio for electrical potting and encapsulating.
XP-163 – High durometer foam used in aerospace applications.
XP-268 – High modulus, high durometer (>70) addition cure system. Download PDF Spec Sheet
XP-288 – P-50 Base with 4 hour working time.
XP-344 – Softer (Shore A 26) version of P-90 translucent.
XP-368 – Slower curing version of P-4.
XP-378 – Highly filled, thermally conductive, low viscosity, 1:1 mix ratio.
XP-382 – Lower durometer (35) version of P-44.
XP-429 – Optically clear silicone gel, 1:1 mix ratio, used in Special Effects.
XP-450 – Clearer version of XP-344.
XP-451 – Lower viscosity version of P-60.
XP-480 – Thixotropic version of XP-429.
XP-535   Very dry version of P-90.  Sensitive mixing ratio.
XP-536   Optically clear.  Available in Shore A 20 or 30.  Strong for an unfilled system.
XP-540   Harder version of P-44, Shore A 50.
XP-541   "Simulate", Thixotropic, fast curing, 10 minutes working time, demoldable in 
              30 minutes.
XP-549   "Quick Sil",  Soft system for FX appliances; 3 minute working time, 
               demoldable in 5 minutes.
XP-550   No bleed softening agent for P-series rubbers. 

XT-135 – Alkyl modified version of GI-1000 to improve chemical resistance and 
               release properties.
XT-153 – Very soft, high elongation rubber used for Special Effects.
XT-177 – Fast setting glue used to repair seams of silicone skins.
XT-190 – Silicone grease.
XT-285 – Base for silicone plastination.
XT-295 – Low viscosity Base for silicone plastination.
XT-314 – Faster curing version of GI-179 Activator.
XT-348 – Longer mold life version of GI-1115.
XT-385 – Special Activator – faster curing, less shrinkage.
XT-386 – GI-311 that can be cured rapidly with the addition of 1% stannous octoate.
XT-410 – Low durometer (Shore A 12), low viscosity, improved mold life.
XT-414 – Faster curing version of GI-298.
XT-426 – Higher specific gravity (1.30) version of GI-650.
XT-464 – Low durometer (Shore A 10), low viscosity (15,000 cstk), medium Specific Gravity 
              (1.20), excellent mold life.
XT-475 – Medium durometer (Shore A 15), low viscosity (20,000 cstk) very dry silicone rubber.
XT-479 – Volatile silicone solvent.
XT-493 – Thixotropic version of GI-1000 Base.
XT-500 – Ultra low temperature (-170°F) version of XT-386.  Cured with dibutyltindilaurate.
XT-507 – Thixotropic version of XT-500.
XT-513   Low shrinkage, very dry, low modulus, high elongation (3% Activator).
XT-531   Shore A 7, 6 hour cure, low shrinkage, excellent library life.
XT-532   Shore A 28, 6 hour cure, low shrinkage, excellent library life.
XT-551   Fast curing, very low shrinkage, 1 hour working time, 8 hour cure time, Shore A 38
XT-554   Translucent, Shore A 30 version of XT-551.
XT-555   Translucent, Shore A 10 version of XT-551.
XT-585   Offset to RP585.  Two Activators - Shore A 18 and Shore A 26.

If you need a special product that does not exist, give us the chance to develop it.