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Capstone™ ST-300
As of early 2025, Chemours Capstone™ has been discontinued, and ChemPoint is committed to helping customers find alternatives. We offer Momentive CoatOSil™ and Silquest™, silicone-based surface-modifying additives, and ICT Thetawet™, Thetaguard™, and Thetapel™ fluorosurfactants and fluoropolymers. Contact us, and one of our technical experts will assist you in finding the closest option for your formulation.
Capstone™ ST-300 is used as a water-based active ingredient in penetrating sealer for acid-sensitive mineral based surfaces. It provides outstanding oil and water repellency and excellent stain resistance.
Quantity
Documents
- Manufacturer: Chemours
- Product Line: Capstone™ Fluorosurfactants
- Product: Capstone™ Repellents for Stone & Tile
- Industries: Building & Construction | Coatings | Energy
- Authorized Countries: Canada | United States
Fulfilled By ChemPoint
Fulfilled By ChemPoint
Manufacturer
Product Line
Industries
Authorized Countries
Canada
United States
Overview
Capstone™ ST-300 is a water-based, anionic fluorochemical dispersion that serves as the active ingredient in VOC free penetrating sealer for stone, unglazed tile, grout, concrete, and brick. Capstone™ ST-300 has a slightly alkaline pH and provides a durable, non-film forming, protective barrier to oil and water of acid sensitive surfaces. When compared to silicone based sealers Capstone™ ST-300 provides superior oil repellency and stain resistance.
Capstone™ ST-300 should be diluted to 1.5-2.5% actives and applied using a brush, roller, or mop. It should never be spray applied. The surface being treated should be thoroughly wetted and allowed to dry for 15-30 min. Excess liquid should then be removed.
Capstone™ ST-300 is only approved for indoor use.
All samples and purchases of Capstone for new projects and applications must first be evaluated for approval by ChemPoint and Chemours.Specifications
Appearance: Colorless to yellow liquid
Stability: Stable at normal temperatures. Perishable if frozen. Viscosity may increase with time or cold storage
pH: 7.5–9
Active Solids, %: 14
Density, g/mL: 1.1
Flash Point (Closed Cup), °C (°F) Not flammable
Boiling Point, °C (°F) ~100 (~212)
Freezing Point, °C (°F) ~0 (~32)
Shelf Life: 2 years
Spray: Do not spray
Primary Chemistry:
Fluorochemical Dispersion
Features & Benefits
- Durable protection from staining
- Superior oil and water repellency
- Retains the natural appearance of stone, tile, concrete or masonry
- Allows substrate to breathe (non-film forming)
- Easy to clean and maintain
- Preserves the beauty of natural stone and tile
- Is in compliance with REACH requirements
- Is listed on TSCA inventory
Problems Solved
Staining of mineral based surfaces such as counter tops by food, beverage, and condiments.
Acid sensitivity of stone and tile materials used in building and construction applications.
Applications
Capstone™ ST-300 is a repellent used in water-based penetrating sealers for stone, unglazed tile, grout, terra cotta, concrete, and brick.
Related Applications
Building & Construction
Coatings
Energy
Related Chemistries
Coatings
Related Functions
Coatings
Related Technologies
Coatings
Capstone™ Fluorosurfactants Articles
Chemours Capstone® LCPFAC & SNUR Regulations
Capstone® fluorosurfactants & fluororepellents were some of the first short-chain alternatives commercialized so Chemours has lots of experience helping their customers reformulate.
Chemours Zonyl® To Capstone™
Capstone™ fluorosurfactants and repellents were introduced as sustainable replacements that meet the goals of the U.S. EPA 2010/15 PFOA Stewardship Program. They are based on short-chain molecules that cannot break down to PFOA or PFOS in the environment.
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