Nanjing SiSiB Silicones / SiSiB Silanes, Silicone Fluids, LSR and Fumed Silica

Selection and quotation of SiSiB chemicals: PC6110, PC3100 and PC2000 silanes, MF2010 fluids, LR liquid rubber, FS fumed silica, STP polymers and ADDSiL stabilizers.

Vinyl Silanes PC6110, PC6120 and SiPOR Systems

SiSiB vinyl silanes chemically bond glass, metals and mineral fillers to polymers. PC6110 (vinyltrimethoxysilane) is grafted onto polyethylene for moisture crosslinking in cables and hot water pipes; PC6120 improves the glass fiber to resin bond. SiPOR pellets carry ready crosslinking systems.

PC6110: min. purity 99.0%
PC6110: boiling point 122 °C
Density 0.960–0.970 at 25 °C
190 kg drums and 950 kg IBCs

Epoxy Silanes PC3100, PC3200 and OP3000 Oligomer

Epoxy silanes promote adhesion in epoxy, urethane, acrylic and polysulfide systems without the yellowing seen with amino silanes. PC3100 is used in polysulfide and polyurethane sealants, filled thermosets and glass roving sizes. OP3000 is an oligomer that releases less methanol on hydrolysis.

PC3100: min. purity 98.0% by GC
PC3100: flash point 135 °C
PC3100: density 1.070 at 25 °C
200 kg drums and 1000 kg IBCs

Sulfur Silanes PC2000 and PC2200 for Rubber Compounds

Polysulfide silanes couple silica filler to rubber: they improve its dispersion, lower heat buildup and raise abrasion resistance. PC2000 is a tetrasulfide and PC2200 a disulfide suited to mixing at high temperature. Grades with the B suffix are 50:50 blends with N330 carbon black.

PC2000: total sulfur 22.7 ± 0.8%
PC2000: flash point min. 100 °C
Dosage 1.0–4.0 phr with silica
Shelf life five years unopened

MF2010 Dimethyl Silicone Fluids

MF2010 fluids are polydimethylsiloxane with viscosities from 5 cSt up to 2.5 million cSt. They serve as damping and heat transfer fluids, O-ring lubricants, release agents, antifoams and dielectric fluids. Standard grades work in open baths from −40 to 200 °C.

MF2010-350: viscosity 350 cSt
MF2010-350: flash point above 300 °C
MF2010-350: freezing point −50 °C
190 kg drums and 950 kg IBCs

LR Series Liquid Silicone Rubber

LSR grades are two-component platinum cure systems for injection molding: one component holds the catalyst, the other the crosslinker. Parts stay flexible from −50 to 230 °C. The LR5200 series gives low compression set without post cure; other grades serve cable accessories and medical devices.

LR5200: hardness 20–70 Shore A
Cure 5 minutes at 165 °C
Compression set max. 20%
Supplied in 20 kg boxes

FS Fumed Silica, Hydrophilic and Hydrophobic

SiSiB hydrophilic silica is made by hydrolysing chlorosilanes in an oxyhydrogen flame; hydrophobic grades are treated with chlorosilanes, hexamethyldisilazane or polydimethylsiloxane. The powder thickens sealants, resins and paints, adds thixotropy and reinforces silicone rubber.

FS0200: BET surface 200 ± 15 m²/g
FS9120: BET surface 105–135 m²/g
FS9120: silica min. 99.8%
10 kg bags, 24 months storage

STP Silane Terminated Polyethers

STP polymers are polypropylene glycol with trimethoxysilyl end groups that cure with air moisture and allow tin-free formulations. They are base polymers for elastic and structural sealants, adhesives and coatings. The typical grades STP31020, STP51280 and STP71280 differ in modulus.

STP31020: viscosity 32,000–42,000 cSt
STP31020: density 1.005 at 25 °C
STP31020: volatiles max. 1%
200 kg drums and 1000 kg IBCs

ADDSiL Polyurethane Foam Stabilizers

ADDSiL silicone surfactants control the cell structure of rigid PU and PIR foams as well as flexible and footwear foams. ADDSiL 11050 is a non-hydrolysable silicone glycol copolymer for rigid foams blown with cyclopentane, HCFC-141b or high water content.

ADDSiL 11050: viscosity 800 ± 200 mPa·s
Density 1.05 ± 0.02 g/cm³ at 25 °C
Use level 1.0–2.5 pphp
200 kg drums and 1000 kg IBCs

Choosing a Silane by Functional Group and Equivalent

The organic group of a silane decides which polymer it reacts with: vinyl with polyethylene and other polymers under peroxide or radiation activation, epoxy with epoxy, urethane and acrylic systems, polysulfide with rubber during vulcanization.

The alkoxy groups hydrolyse with moisture to silanols that bond to glass, metal and filler. Equivalents are listed by the manufacturer: PC6110 matches Momentive A-171, Dow Z-6300 and Evonik Dynasylan VTMO, PC3100 matches A-187 and Dynasylan GLYMO, PC2000 matches Evonik Si-69.

For PC2000 the recommended level is 0.5–1.0 phr with clay and 1.0–4.0 phr with silica. Shelf life is one year for PC6110 and PC3100 and five years for PC2000.

Fumed Silica: Surface Area and Treatment

The hydrophilic grades FS0150, FS0200, FS0300 and FS0380 differ in BET surface area: 150, 200, 300 and 380 m²/g. Hydrophilic silica thickens non-polar media such as xylene, styrene and mineral spirits: silanol groups on the particles form hydrogen bonds and a three-dimensional network; the pH of a 4% dispersion of FS0200 is 3.6–4.3.

Hydrophobic grades are chosen for thixotropy in polar adhesives and sealants based on isocyanates and epoxies and for reinforcing silicones without strong thickening. After hexamethyldisilazane treatment FS9120 has 105–135 m²/g, 1.0–2.0% carbon and a tamped density of 40–60 g/L.

Sealant Binders: STP and MQ Resins

STP31020 is polypropylene glycol with trimethoxysilyl ends and a viscosity of 32,000–42,000 cSt; it cures with moisture in one- or two-component systems, the formulation has no isocyanate or solvent, and curing produces no bubbles or odour.

Uses include transportation and construction sealants, transparent potting adhesives and low or medium modulus sealants. The MQ resin SR8621 is a co-hydrolysis product of tetraalkoxysilane and trimethylalkoxysilane with an M:Q ratio of (0.8–1.0):1, a molecular weight of 3000–5000 and 1–2% OH.

It serves as a reinforcing filler for pressure sensitive silicone adhesives and in protective coatings; it ships in 25 kg fiber drums with 18 months shelf life.

Processing LSR and Polyurethane Foam Stabilizers

Liquid silicone rubber is mixed from two components and platinum cured: LR5200 cures in 5 minutes at 165 °C and without post cure reaches a compression set of max. 20–25% and a tensile strength of 6.0 to 8.5 MPa depending on hardness; shelf life is one year. ADDSiL 11050 is dosed at 1.0–2.5 pphp.

Stored below 20 °C the stabilizer turns hazy and below 10 °C it solidifies to a soft wax, so it is warmed to room temperature and stirred before use; shelf life is 12 months from the date of production.

Nanjing SiSiB Silicones / SiSiB and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of Nanjing SiSiB Silicones / SiSiB and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.