Name: SiSiB® PC2000
Brand: Nanjing SiSiB Silicones Co., Ltd.
Price: 100 USD

Technical Data

CAS No.	40372-72-3
EINECS No.	254-896-5
Empirical Formula	C₁₈H₄₂O₆S₄Si₂
Molecular Weight	539
Color and Appearance	Yellowish liquid
Density_(16/24_°C_)(g/cm3)	1.1 +/- 0.02
Refractive Index	1.386 [25°C]
Secondary Components	Propyltriethoxysilane
	Chloropropyltriethoxylsilane
	Ethanol
Boiling Point at 1013 mbar(°C)	Decomposition above 250
Pour Point(°C)	App. –80
Flash Point (°C)	Min. 100
Volatiles Components(%)	Max. 4.0
Average Chain Length(%)	3.75 +/- 0.15
Total Sulfur (standard value)(%)	22.7 +/- 0.8

Solubility:

Soluble in Primary alcohols, ketones, benzene, toluene, dimethylformaminde, chlorinated hydtocarbons, cetonitrile, dimethysulfoxide; Insoluble in Water;

Application

When used in rubber compounds, it produces these effects:
Silane coupling agent for non-black pigments.
Cure equilibrium for reversion resistance.
Curing agent for good heat aging.
Coupling Agent - With as little as 0.5 to 1.0 phr with clay fillers and 1.0 to 4.0 phr for silica pigments, SiSiB® PC2000 couples the non-black pigment and elastomers resulting in increases in modulus of low modulus silicone and increase in abrasion resistance.

Cure Equilibrium - SiSiB® PC2000 has four sulfur atoms positioned in the center.

At cure temperatures, these participate with sulfur in producing polysulfidic crosslinks. The SiSiB® PC2000 replaces crosslinks broken during cure, resulting in reversion resistant, and with proper compounding, reversion free compounds. This is known as equilibrium cure. The dynamic flex characteristics, E.G., heat generation and crack growth, are dramatically improved.

Curing Agent - Removing all sulfur from the compound for NR, SBR, NBR and replacing it with SiSiB® PC2000 and certain thiuram accelerators, produces compounds with excellent heat aging characteristics in addition to the coupling effects.