CAB-O-SIL M-7D is a densed, medium-high surface area fumed silica used to reinforce silicone rubber. As the densed form of CAB-O-SIL M-5, CAB-O-SIL M-7D offers a higher bulk density that allows for faster incorporation and easier handling during compounding, making it a practical choice for rubber formulators seeking reliable reinforcement without excessive dust and slow wet-in times.
Key Properties of CAB-O-SIL M-7D
Like all untreated fumed silicas, CAB-O-SIL M-7D is characterized by high purity, an aggregated structure, submicron particle size, low bulk density relative to other mineral fillers, and a hydrophilic surface. These characteristics give formulators a consistent, high-purity reinforcing filler, though the hydrophilic surface means further surface modification is sometimes necessary to prevent crepe hardening in finished rubber compounds.
- High purity fumed silica
- Aggregated structure for reinforcement
- Submicron particle size
- Densed grade with higher bulk density than standard M-5
- Hydrophilic surface
Why the Densed Grade of CAB-O-SIL M-7D Matters
Because CAB-O-SIL M-7D has a higher bulk density than standard untreated grades, it facilitates faster wet-in and incorporation into viscous polymer systems. This is particularly useful for rubber compounders working with liquid silicone rubber (LSR) or high consistency rubber (HCR), where slow incorporation can bottleneck mixing lines.
With a densed, higher bulk density silica such as this grade, very high shear dispersion equipment is recommended to achieve adequate dispersion throughout the polymer matrix. Formulators should plan mixing equipment and cycle times accordingly, since under-dispersion can leave reinforcement benefits unrealized.
Handling and Dispersion Considerations
Buyers switching from a lower-density fumed silica to this grade should expect to adjust dispersion parameters. High shear mixing equipment, controlled addition rates, and adequate mixing time all support consistent reinforcement performance across production batches.
Typical Applications for CAB-O-SIL M-7D
CAB-O-SIL M-7D fumed silica is suitable for reinforcement of silicone rubbers, including heat-cured rubber, high temperature vulcanizing or high consistency rubber (HTV or HCR), and liquid silicone rubber (LSR). In these systems it can increase hardness, tensile strength, and elongation, supporting more durable finished parts. Thousands Chemicals supplies CAB-O-SIL M-7D alongside a broader auxiliary agent range for composite and rubber formulators sourcing reinforcing fillers.
Product Form and Logistics
it is supplied as a powder with global regional availability. Standard packaging options include 10 kg and 20 lb bags or 500 lb FIBCs for North America, and poly-shrouded units containing 18 x 20-kg paper bags (360 kg net weight) for EMEA markets, giving formulators flexibility to match packaging to production volume.
Sourcing this grade for Important Silicone Rubber Applications
Thousands Chemicals connects rubber compounders and composite formulators with this product and related auxiliary agent products through our digital B2B marketplace, sourced as recommended international brand products through established supply chain resource support. Our team can help confirm packaging, lead times, and technical documentation for your target application and order volume.
FAQ
What is it used for?
It is a densed fumed silica used to reinforce silicone rubbers, including HTV, HCR, and LSR systems, where it increases hardness, tensile strength, and elongation.
How does this grade differ from CAB-O-SIL M-5?
this product is the densed form of CAB-O-SIL M-5, offering a higher bulk density that supports faster incorporation and easier handling during compounding.
What dispersion equipment does it require?
Because it is a densed, higher bulk density silica, very high shear dispersion equipment is recommended to achieve adequate dispersion throughout the polymer system.
What packaging options are available for this grade?
Standard options include 10 kg and 20 lb bags or 500 lb FIBCs in North America, and poly-shrouded units of 18 x 20-kg paper bags (360 kg net weight) for EMEA markets.
Can I request documentation before ordering?
Yes. Our team can share the technical data sheet and safety documentation for this product to support your formulation and purchasing decision.
Ready to source it for your next silicone rubber batch? Contact our team to request pricing, lead times, and technical documentation for your application.
