Top 10 Best colloidal silica in 2026

Last Updated - 6/25/2026

🏆Best Choice

Fasco Epoxies

Fasco Epoxies - Fasco Cab-O-SIL Fumed Silica thickener in Quart tub

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•Cabosil – Also called fumed silica, it is a hydrophilic silica powder, a lightweight material that is easy to use and can be added to any application
•Thickener - Thickening powder for epoxy, silicone, paints, varnishes, and liquids significantly increases the viscosity of the liquid and produces a non-sagging property.
•Strong Adhesive - Fumed silica has strong stability, making it easy to strengthen gel coat, epoxy, polyester, paint and so on. It is also used to make ceramic blanket rigidizer.
•Multi Usage – Cabosil is suitable for thickening epoxy resin. Additionally, it is suitable for rubber reinforcement, and can also be combined with fillers or fibers to prevent them from sagging.

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$12.99

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Orgono Living Silica

Orgono Living Silica Collagen Booster | Vegan Mineral-Based Silica Supplement | Supports Healthy Collagen & Elastin Production for Joint & Bone Support, Glowing Skin, Strong Hair & Nails | 16.9 Fl Oz

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•UNLEASH YOUR OWN COLLAGEN: LIVING SILICA Mineral-Based Collagen Booster Liquid supports your own body's collagen, keratin, and elastin levels. Designed to supply a key trace element, silicon, which your body uses to promote glowing skin, stronger hair and nails, as well as healthy joints and bones for improved mobility and flexibility.
•THE MOST EFFECTIVE FORM OF SILICA: No other colloidal silica, silicic acid or plant extract-based silica supplements in the marketplace provide higher bioavailability than LIVING SILICA. When you absorb more silica into your body, you’re able to generate more collagen. The problem is that most people consume collagen to get its ultimate effects.
•375% GREATER ABSORPTION: According to independent clinical trials performed in the UK, LIVING SILICA’s proprietary blend has the highest absorption rate. LIVING SILICA’s is fully utilized by the body instead of being expelled. LIVING SILICA reaches the collagen-producing cells and activates them, which promotes their collagen production.
•CLINICALLY BACKED: Clinical studies have demonstrated impressive results on the health of skin, hair, and nails, as well as on bones and joints, further confirming LIVING SILICA's effectiveness. It has been very effective in providing quick and visible results in a short time thanks to its assimilation.
•HIGHEST QUALITY STANDARD: LIVING SILICA is vegan friendly & free of GMOs, soy, dairy, egg, corn, wheat, gluten, fish/shellfish, peanuts/nuts/tree nuts, animal-derived ingredients, artificial colors or preservatives, or any flavors or sweeteners.

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$29.95

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Orgono Living Silica

Living Silica Plant Based Collagen Booster | Vegan | Supports Healthy Collagen and Elastin Production for Joint & Bone Support, Glowing Skin, Strong Hair & Nails 500 ml | 16.9 Fl Oz

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Living Silica Plant-based silicon supplement is a formula designed for your well-being and to maximize your body’s potential supplying a key trace substance, silicon, your body uses in joints, bones, hair, skin, and nails from the inside out.
•The silicon ingredient benefits have been studied in humans. LIVING SILICA ’s silicon-based ingredient is a trace element found in nature and is laboratory tested to ensure quality and safety*.
•When it comes to silicon, absorption matters. LIVING SILICA is a premier grade of silicon supplement. Our clinical scientist developed the patent-pending, proprietary process to allow the LIVING SILICA to remain in a silicon form best suited for intestinal absorption.
•375% Greater Absorption*. According to independent clinical trials performed in the UK, Living Silica’s proprietary blend has the highest absorption rate. Living Silica is fully utilized by the body; instead of being expelled, it reaches the collagen-producing cells to activate them, promoting their collagen production. Our proprietary method developed by Loic Le Ribault raises the solubility limit of Si and maintains it in a small, monomeric, and absorbable form.

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$29.95

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West System

West System 406-7 Collodial Silica 5.5oz, off-white

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•406 Colloidal Silica is an epoxy thickening additive used to control the viscosity of the epoxy.
•Prevents epoxy runoff in vertical and overhead joints.
•Can be used to improve strength, abrasion resistance, and consistency of epoxy fairing compounds.
•Cures to an off-white color.

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$36.22

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Fiberglass Supply Depot

Cabosil Fumed Silica (4oz Jar) - Resin Thickener for Non-Saggy Putty - Advanced Epoxy Resin Thickener - Professional Thixotropic Agent for Smooth Epoxy

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Optimal Solution: Fiberglass Supply Depot Inc.’s colloidal silica is a must-have product for those of you who want to work with smooth, non-saggy epoxy resin. This product acts as a premium thixotropic agent that allows you to control the viscosity of mixed epoxy systems.
•Easy to Use: This epoxy thickener is designed to be used alone for a smooth and non-sagging high-strength mixture. Additionally, it can also be combined with fillers or fibers to prevent them from sagging.
•Designed for Resin: This fumed silica is formulated to provide sag resistance, as well as anti-settling and anti-corrosive performance. Our colloidal silica ensures high shelf stability and mechanical reinforcement in epoxy coatings.
•Small Size: Our fumed silica comes in a 4oz package and can be mixed with other fillers to create custom blends. Cabosil can be added to any type of resin mix and simply stirred by hand.
•Technical Features: This Cabosil filler may be synthesized by high temperature hydrolysis of SiCl4 in O2(N2)/H2 flame. The formula is amorphous and it possesses a very high specific area. The microdroplets of amorphous silica fuse into a branch and form a chain-like agglomerate, which helps to thicken the resin mixture.

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$6.89

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West System

West System 406-2 Colloidal Silica 1.7 oz

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•406 Colloidal Silica is an epoxy thickening additive used to control the viscosity of the epoxy.
•Prevents epoxy runoff in vertical and overhead joints.
•Can be used to improve strength, abrasion resistance, and consistency of epoxy fairing compounds.
•Cures to an off-white color.

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$25.80

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TITGGI

1 Quart 100% Pure Fumed Silica Powder, Advanced Thickener for Epoxy, Paints, Varnishes, Professional Fumed Silica for Filling Cracks and Voids, Worked Well for Ceramic Blanket Rigidizer - by TITGGI

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•100% Pure - Professional fumed silica, hydrophilic silica powder with a specific surface area of 200, is a lightweight material that is easy to use and can be added to any application with just hand stirring, also known as gas-phase silica or colloid.
•Paint Thickener - Thickening powders for epoxy, silicone, paints, varnishes, and liquids significantly increase the viscosity of the liquid system and produce non-sagging properties. TITGGI fumed silica is an excellent touch-changing agent.
•Strong Adhesive - Fumed silica is highly temperature resistant, has strong stability, creates non-sagging properties, can repair holes & thicken sailboat hull gel coat, it is also to make ceramic blanket rigidizer.
•Multi Usage - Fumed silica suitable for thickening epoxy resin for dreamer and resin art. Additionally, it is suitable for rubber reinforcement, and can also be combined with fillers or fibers to prevent them from sagging.
•Look for TITGGI fumed silica powder to achieve unparalleled results in your projects. With its fine, lightweight particles, TITGGI fumed silica ensures optimal dispersion and superior effectiveness, making it an essential ingredient for high-quality applications. Trust TITGGI for precise, reliable results and elevate your work to the next level.

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$13.23

$17.88

-26%

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SYSTEMTHREE

System Three Silica Thickener, 1 Qt Tub, White

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Premium Thickener: Also referred to as colloidal or hydrophilic fumed silica, our silica thickener is an excellent thixotropic agent designed to help control the viscosity of mixed epoxy systems
•Measure And Mixing: Mix the amount of resin, Part A, and hardener, Part B, desired, then add silica thickener in increments, and mix thoroughly, stirring from the bottom to the top until the desired consistency is reached
•Features: This epoxy thickener easily mixes into epoxy resin systems
•Consistency: Silica Thickener can be used alone to create a very smooth, non-sagging, high-strength mixture, but can also be combined with other fillers or fibers to prevent sagging
•Cleanup: Clean hands, exposed skin, and work surfaces with mild soap and water

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$14.95

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MAS

MAS Epoxies Colloidal Silica Epoxy Thickener, High Strength Epoxy Filler Additive for Wood, Marine, and Fiberglass, Structural Bonding & Filleting for 2:1 or 5:1 Epoxy Resin Systems (1 Quart)

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•STRUCTURAL EPOXY FILLER: Add to epoxy resin for high-strength structural bonding, filleting, or filling. Compatible with MAS 2:1 Non-Blushing and 5:1 Marine Epoxy Resin systems.
•EXCELLENT THICKENING POWER: Thickens epoxy to desired consistency for controlled application on vertical or uneven surfaces—ideal for creating gap-filling pastes or filleting blends.
•HIGH DENSITY PERFORMANCE: Increases compressive strength and durability of cured epoxy. Ideal for structural bonding, wood repairs, marine construction, and fiberglass reinforcement in demanding builds.
•MIXES CLEAN & CONSISTENT: Blends smoothly into epoxy resins without clumping. Easily create your own structural adhesive or fairing compound for boat repair or home builds.
•MULTIPURPOSE USE: Works in marine epoxy, wood epoxy filler, and concrete crack filler applications. Great for adding thixotropy and sag resistance to any epoxy-based job.

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$17.99

$19.99

-10%

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TotalBoat

TotalBoat Fumed Silica Cabosil Powder Thickener for Epoxy Resin, Polyester Resin, Paint, Silicone, and Varnish (5 Quart)

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Hydrophilic fumed silica, also known as cabosil or colloidal silica, is a thixotropic additive thickening agent that lets you customize the viscosity of epoxy, polyester resin, paint and more
•Epoxy thickened with this fine silica powder won’t sag or slump, ideal for vertical and overhead surfaces. Easy to stir into mixed resin and hardener, and easy to sand upon full cure
•It creates a smooth, strong epoxy compound ideal for bonding, filleting, and filling. Epoxy or polyester resin thickened with silica can be used to fill holes, cracks, and gaps
•Combine this versatile filler with TotalBoat epoxy and Glass Micro Balloons or Milled Glass Fibers for easy sanding and additional strength
•Use with gelcoat, paints, acrylics, silicones, rubber, urethanes, adhesives and other materials to prevent sagging. Available in 1 Quart and 5 Quart sizes

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$25.99

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