Colloidal Silica - A Versatile Problem Solver, Product Article

Binder Applications

LUDOX® colloidal silica forms robust ionic and hydrogen bonds with granular and fibrous material. These bonds are both thermally stable and chemically inert, making them particularly useful for various applications:

• Investment Casting Slurries
• Vacuum Formed Refractories
• Specialty Coatings
• Catalysts
• Insulation Board

Surface Modification Application

The silica particles in LUDOX® bond well with many surfaces through ionic and hydrogen bonding. After application, these particles increase the coefficient of friction, making them beneficial for:

• Paper & cardboard
• Flooring
• Polishing Slurries
• Industrial and architectural coatings

Flocculant Applications

LUDOX® colloidal silica is offered in grades with either anionic or cationic sol charge. When introduced to solutions, LUDOX® particles bond ionically with oppositely charged particles and precipitate out of suspension. This property makes LUDOX® an excellent flocculant for:

• Paper retention and drainage
• Beverage fining (beer and wine)
• Insulation board

The characteristics of LUDOX® Colloidal Silica and its effectiveness as a binder and surface modifier are further illustrated in the short video below.

Today, LUDOX® colloidal silica is used in diverse applications ranging from a high-temperature binder for aerospace part production to a fining agent in beer and wine making. LUDOX® serves three primary commercial purposes: as a binder, surface modifier, and flocculant. LUDOX® colloidal silica forms strong ionic and hydrogen bonds with granular and fibrous materials. These bonds are thermally stable and chemically inert, making them particularly useful for various applications. The silica particles in LUDOX® adhere well to many surfaces through ionic and hydrogen bonding. Once applied, these particles increase the coefficient of friction, which is beneficial for multiple surfaces. LUDOX® colloidal silica is available in grades with either anionic or cationic sol charge. When added to solutions, LUDOX® particles bond ionically with oppositely charged particles and fall out of suspension, making it an excellent flocculant for numerous uses. The characteristics of LUDOX® Colloidal Silica and its effectiveness as a binder and surface modifier are further illustrated in the short video below.

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Of all the oxide minerals in the Earth's crust, silicon dioxide, or silica, is the most abundant. It is not only found in combination with other oxide minerals but also in isolated forms such as sand. The semi-precious mineral opal, prized for centuries, is a form of amorphous silica.

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Besides being the most abundant mineral on Earth, silica is also essential to life. Diatoms, a type of phytoplankton forming the base of the ocean's food chain, have skeletons composed of silica. Many plants use silica to stiffen stems for holding fruit and to form external needles for protection. While its role in animals is less obvious, each of us contains about half a gram of silica, crucial for forming our bones, hair, and teeth.

Silica has not only played a crucial role in biology but has also been significant in civilization. Flint, a form of silica, was used in ancient tools. The sand used in pottery is also a form of silica. Amorphous silica from volcanic ash contributed to the high strength and durability of 2,000-year-old Roman cement. Modern technology heavily relies on silica for creating catalysts in oil refineries, binding molds for super-alloy casting, forming modern glass and ceramics, and polishing electronic materials.

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