Products for the Mix

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Products for the Mix — Concrete Mix Ingredients & Additives | Fishstone

Products for the Mix

Concrete mix ingredients, additives, fibers, aggregates, and pre-blended mixes for countertops, GFRC, and decorative concrete.

Admixtures Polymers Fibers Pigments Aggregates Bag mixes

What goes into your concrete mix determines everything — strength, workability, surface quality, color, and long-term performance. Fishstone carries a curated selection of professional-grade mix ingredients designed to work together for consistent, repeatable results. Whether you are formulating a custom GFRC mix from scratch or fine-tuning an existing recipe, this is your source for the materials that matter.

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Admixtures & Pozzolans Plasticizers, accelerators, retarders, defoamers, shrinkage reducers, silica fume, metakaolin
Pigments Integral concrete pigments for consistent, fade-resistant color throughout the mix
Fibers & Reinforcements AR glass fibers, PVA fibers, carbon fiber, and glass scrim for tensile strength and crack resistance
Pre-blended Bag Mixes Ready-to-use high-performance mixes for countertops and GFRC casting
Aggregates Silica sand, glass aggregates, microspheres, lightweight fillers, and decorative aggregates

Polymers & plasticizers

Acrylic polymers and superplasticizers are the foundation of high-performance concrete mixes. Polymer replaces a portion of mix water to dramatically improve strength, flexibility, and surface quality. Superplasticizers allow you to achieve fluid, workable concrete without adding excess water — preserving compressive strength and reducing shrinkage.

KongKrete Liquid Acrylic Polymer
The go-to liquid acrylic polymer for GFRC and countertop mixes. Improves tensile strength, flexibility, adhesion, and curing performance. Used at 10–20% polymer-to-cement ratio by weight.
KongKrete Dry Acrylic Polymer
Dry powder version of KongKrete for situations where liquid polymer is impractical. Blends directly into dry mix components for easy batching.
Optimum 380 Premium Superplasticizer
High-range water reducer that dramatically improves flow and workability without excess water. Ideal for countertop and GFRC mixes requiring smooth, self-consolidating consistency.
P-120 Superplasticizer
Versatile superplasticizer for water reduction and improved mix flow. A cost-effective option for standard countertop and precast applications.
Supercizer 7 Superplasticizer
Additional superplasticizer option for achieving target flow in demanding mix designs.

Admixtures & pozzolans

Admixtures modify concrete behavior during mixing, placing, and curing. Pozzolans are supplementary cementitious materials that react with calcium hydroxide to improve density, strength, and long-term durability. Together they give you precise control over set time, shrinkage, surface finish, and mix performance.

Super-Six Admix
Multi-component admixture that improves density, flow, and surface finish quality. A staple in countertop and GFRC mixes for consistent results.
SetBoost Pro Concrete Accelerator
Accelerates set time for faster demolding and production turnaround, particularly useful in cold weather or high-volume shop environments.
Delay Set Retarder Admixture
Extends working time for complex pours, large panels, or warm weather casting where early set is a problem.
SRA-101 Shrinkage Reducing Admixture
Reduces drying shrinkage and the associated cracking risk, especially valuable for thin-section GFRC and large countertop slabs.
C-64 Defoamer & Densifying Admixture
Eliminates entrapped air bubbles and densifies the cement matrix, reducing pinholes and improving surface quality.
Super Slump Buster
Quickly stiffens an overly wet mix without compromising strength. Useful for rescuing mixes that have been over-watered.
Bottle-Pozz
Fishstone's proprietary pozzolan blend that improves long-term strength, reduces permeability, and enhances surface finish quality.
Metakaolin, White
High-reactivity pozzolan that improves strength, reduces permeability, and brightens the mix — especially valuable in white or light-colored concrete.
Silica Fume, White
Ultra-fine pozzolan that fills microscopic voids in the cement matrix, producing exceptionally dense, strong, and low-permeability concrete.

Fibers & reinforcements

Fiber reinforcement increases tensile and flexural strength, reduces cracking, and allows thinner concrete sections. Different fiber types suit different applications — from alkali-resistant glass for GFRC to carbon fiber for structural reinforcement.

AR Glass Fibers
Alkali-resistant glass fibers for GFRC and reinforced concrete. Provides tensile strength, crack resistance, and allows thin-section casting. Available in multiple lengths for spray-up and premix applications.
AR Glass Net (Scrim)
Woven alkali-resistant glass mesh for additional reinforcement in thin slabs and panels. Placed in layers during casting for structural support.
PVA Fibers
Polyvinyl alcohol fibers that bond chemically with cement for excellent crack control and ductility in countertop and panel mixes.
C-Grid Carbon Fiber Reinforcement
Carbon fiber grid for high-strength structural reinforcement in thin concrete sections where steel rebar is not practical.

Pre-blended bag mixes

Fishstone's pre-blended mixes take the guesswork out of mix design. Each formula is engineered for specific applications — from high-performance countertop casting to demanding architectural GFRC work — delivering consistent, professional results batch after batch.

HP50 High-Performance Bag Mix, 50lb
The standard Fishstone bag mix for GFRC countertops and casting applications. Optimized sand-to-cement ratio, consistent batch-to-batch performance, works with KongKrete polymer and standard admixtures.
Ultracast 360, 45lb
Premium casting mix for demanding architectural and decorative applications. Formulated for exceptional surface quality, high strength, and reliable performance in complex molds and thin sections.

Pigments

Integral pigments blend directly into the concrete mix to produce consistent, fade-resistant color that goes all the way through the slab. Available in a wide range of colors to match any design requirement.

Concrete Pigment
Professional-grade iron oxide pigments for integral concrete color. Available in a broad range of colors. Dosage-controlled for repeatable results across multiple batches.

Aggregates & fillers

Aggregates give concrete its body, texture, and exposed surface character. Specialty aggregates and lightweight fillers allow you to control weight, appearance, and workability of the final mix.

Premium Silica Sand, 40–50 mesh, 50lb
Clean, consistent silica sand for countertop and GFRC mixes. The 40–50 mesh gradation is ideal for smooth surface finishes and tight mix designs.
Microspheres
Hollow glass microspheres that reduce mix density and improve workability. Used in lightweight concrete formulas and where weight reduction is a priority.
Featherlight Concrete Aggregate/Filler
Lightweight aggregate/filler for significantly reducing the weight of concrete panels and castings without major strength loss.
Glass Aggregate
Recycled glass aggregate for decorative concrete surfaces. Creates a distinctive sparkle effect when exposed through grinding or polishing.
Fire Glass, 10lb bag
Tempered glass aggregate for fire features and decorative concrete applications requiring heat resistance.
Mother of Pearl Aggregate
Iridescent shell aggregate that produces a luminous, high-end decorative effect when exposed in polished concrete surfaces.

What can you make with these materials?

Concrete countertopsFull mix systems for cast-in-place and precast countertop production.
GFRC panels & castingsAR fiber, polymer, admixtures, and bag mixes for spray-up and premix GFRC.
Fireplace surroundsLightweight GFRC and fiber-reinforced mixes for heat-tolerant decorative elements.
Concrete furnitureHigh-strength mixes for tables, benches, and custom furniture pieces.
Architectural claddingThin-section GFRC systems for lightweight facade and wall panel applications.
Decorative precastPigments, specialty aggregates, and admixtures for high-detail decorative castings.

Learn more

GFRC mix design guide Ratios, fiber loading, material selection, and troubleshooting
Eliminate pinholes in concrete Causes, prevention, and surface defect troubleshooting
Acrylic polymer in concrete How polymer affects strength, flexibility, and cure performance
GFRC basics An introduction to glass fiber reinforced concrete and how it works