The R.J. Marshall Company

What The R.J. Marshall Company does

The R.J. Marshall Company was a privately held US industrial raw materials distributor and formulator founded in 1978 and headquartered in Southfield, Michigan. The company supplied specialty fillers, additives, and coatings to manufacturers of cast polymer products, solid surface materials, fiberglass reinforced plastic (FRP), and flame- or smoke-resistant thermoset and thermoplastic parts. Its portfolio spanned three categories: Solid Surface/Cast Polymer products (DGE & LXS Solid Surface, Crystalline Concrete, Terrazzo, Spray Granite Extreme/Advantage, Dense Fill ATH, Densified Color Granules, Reflections/Metal Flake, Prolite Lightweight Filler, Onyx Fill, Calcium Carbonate, Stone Fill HD, SprayCoat); Fiberglass Reinforced Plastic products (Spraylite Lightweight Filler, Spray Granite for Pools & Spas, Pulpro/Calcium Sulfate); and Coatings, Sealants, Adhesives, and Putties products (ResNsand Ultra, Prolite Microsphere Blends, Fiber Blends & Compounds). It also operated Marshall Additive Technologies as a division focused on antimony trioxide-based Flame Defense and Smoke Defense additives for polymer flame retardancy.

The business model was a quote-based B2B industrial supply operation selling directly to manufacturers via a single inbound phone line ((800) 338-7900), with no consumer-facing channel, no disclosed pricing, and no public revenue. The firm employed between 11 and 50 people throughout its operating life and reported no funding rounds, patents, certifications, or third-party awards. Ownership and management beyond founders Joan E. Marshall and Richard J. Marshall are not publicly documented.

On August 1, 2025, the company announced it had ceased operations. Product lines and assets were partitioned across three acquirers: Huber Engineered Materials took over tan and white ATH (alumina trihydrate) and Smoke Defense; Dorfner/ACS USA assumed granite effect, Prolite, Spraylite, and fiber blend products; and Michigan Additives Technologies Inc. acquired the Flame Defense antimony trioxide line together with the Erie, Michigan production facility. As of the source date, the entity is closed and is no longer conducting business.

Name

The R.J. Marshall Company

Legal name

The R.J. Marshall Company

Website

https://rjmarshall.com

Company type

Private

Founded year

1978

Operating status

Closed

Headcount range

11–50 employees

Short description

The R.J. Marshall Company was a US industrial raw materials supplier, founded in 1978, that produced specialty fillers, coatings, and flame retardant additives for cast polymer, composites, and thermoset/thermoplastic manufacturers; the firm ceased operations in August 2025 and divested its product lines.

Ownership category

akta.pro rank

Product category

Industrial Raw Materials and Specialty Chemical Additives

NAICS

Resin and Synthetic Rubber Manufacturing (32521)

SIC

Miscellaneous Chemical Products (2890), Plastic Material, Synth Resin/Rubber, Cellulos (No Glass) (2820)

akta.pro primary industry

Polymer Additives & Modifiers (Stabilizers, Plasticizers, Impact Modifiers, FRs) (IMAEANAK)

akta.pro secondary industries

Fiber- & Mineral-Filled Reinforced Compounds (Glass/Carbon/Talc/CaCO3) (IMANABAI), Masterbatch Manufacturing (Color, Additive, White/Black) (IMANABAD)

Keywords

• Industrial raw materials
• Cast polymer fillers
• ATH flame retardants
• Solid surface additives
• Fiberglass reinforced plastic fillers

Headquarters

HQ city

Southfield

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales

Distribution channels1 record

Core offering

The R.J. Marshall Company supplied industrial raw materials and specialty additives for cast polymer and composites manufacturers, including ATH (alumina trihydrate) fillers, densified color granules, lightweight microspheres, spray granite coatings, and stone fills used in solid surface, terrazzo, and crystallized concrete manufacturing. Through its Marshall Additive Technologies division, the company also produced flame retardant and smoke suppression additives (including antimony trioxide-based Flame Defense products) for thermoset and thermoplastic polymer applications.

Product overview

The R.J. Marshall Company was a supplier of industrial raw materials for the cast polymer and composites industries, and flame retardant solutions for thermoset and thermoplastics. The product portfolio centered on three main categories: Solid Surface/Cast Polymer products (including DGE & LXS Solid Surface, Crystalline Concrete, Terrazzo, Spray Granite Extreme/Advantage, Dense Fill ATH, Densified Color Granules, Reflections/Metal Flake, Prolite Lightweight Filler, Onyx Fill, Calcium Carbonate, Stone Fill, and SprayCoat); Fiberglass Reinforced Plastic products (including Spraylite Lightweight Filler, Spray Granite Advantage for Pools & Spas, and Pulpro/Calcium Sulfate); and Coatings/Sealants/Adhesives/Putties products (including ResNsand Ultra, Prolite Microsphere Blends, and Fiber Blends & Compounds). The company also operated Marshall Additive Technologies (MAT), a division focused on flame and smoke additives. The company closed operations on August 1, 2025, with product lines transferred to Huber Engineered Materials (ATH and Smoke Defense), Dorfner/ACS USA (granite effect, Prolite, Spraylite, fiber blend), and Michigan Additives Technologies (Flame Defense).

Differentiator

Problem solved

Functional benefit

Brands

• Marshall Additive Technologies: A division of The R.J. Marshall Company focused on flame and smoke additives.

Products and services

• Solid Surface / Cast Polymer Product Line Granite effect colors, spray granite fillers, ATH (alumina trihydrate) fillers, densified color granules, lightweight microspheres, stone fills, and decorative metal flake additives sold to manufacturers of solid surface, cast polymer, terrazzo, and crystallized concrete products.
• Fiberglass Reinforced Plastic (FRP) Product Line Spraylite lightweight fillers, spray granite coatings, calcium sulfate (Pulpro), and SprayCoat products supplied to fiberglass reinforced plastic manufacturers, including specialized coatings for pool and spa applications.
• Coatings, Sealants, Adhesives, and Putties Product Line Slip-resistant aggregates, lightweight microsphere blends, fiber blends and compounds, and calcium sulfate additives for industrial coatings, sealants, adhesives, and putties manufacturers.
• Smoke Defense Additives Smoke suppression additive products supplied to thermoset and thermoplastic polymer manufacturers for fire safety and smoke suppression compliance.
• Flame Defense (FD) Antimony Trioxide (AO) Additives Antimony trioxide-containing flame retardant additives for thermoset and thermoplastic polymer applications, produced at the Erie, MI facility. Sold under the Marshall Additive Technologies division.

Segments2 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

Three partnerships are on record, tiered minor.

• Huber Engineered MaterialsminorOthers · 1 August 2025Huber Engineered Materials assumed business matters related to tan and white ATH (alumina trihydrate) and Smoke Defense products following R.J. Marshall Company's closure on August 1, 2025.
• Dorfner/ACS USAminorOthers · 1 August 2025Dorfner/ACS USA assumed business matters related to granite effect, Prolite, Spraylite, and fiber blend products following R.J. Marshall Company's closure on August 1, 2025. These product lines continue under Dorfner's distribution.
• Michigan Additives Technologies IncminorOthers · 1 August 2025Michigan Additives Technologies Inc acquired the Marshall Additive Technologies Flame Defense (FD) Antimony Trioxide (AO) containing product line along with the production facility in Erie, MI from The R.J. Marshall Company, effective August 1, 2025.

Scale indicators1 record

Recent moves4 records

Expansion highlights3 records

Broad incumbents

• Clariant: Specialty chemicals company producing flame retardants, polymer additives, and color masterbatch products. Comparable to R.J. Marshall's additives and color granule offerings, though at much larger scale and global reach.
• Albemarle Corporation: Specialty chemicals producer with a significant brominated flame retardant and polymer additives portfolio serving thermoplastics and thermosets. A broad incumbent in the same flame retardant end markets R.J. Marshall addressed.
• Imerys: Global specialty minerals leader supplying ATH, calcium carbonate, and performance mineral fillers to polymer, coatings, and cast polymer manufacturers. Overlaps heavily with R.J. Marshall's filler and ATH product categories but at vastly greater scale.
• LANXESS: Major global producer of flame retardants and polymer additives including brominated, phosphorus-based, and antimony synergist systems. Overlaps directly with the Flame Defense product line formerly sold by R.J. Marshall.
• Omya: Global leader in ground calcium carbonate and mineral fillers for polymers, paints, and solid surface applications. Directly competes with R.J. Marshall's calcium carbonate (marble dust) and filler offerings to cast polymer manufacturers.
• Minerals Technologies Inc. Major producer of specialty mineral products including precipitated calcium carbonate and ground calcium carbonate used in solid surface, composites, and plastics. Directly comparable to R.J. Marshall's calcium carbonate and mineral filler lines.
• ICL Group: Specialty minerals and flame retardant producer offering ATH, antimony trioxide alternatives, and other polymer additives. Directly competes in the flame retardant additive space that was a key segment for R.J. Marshall.

Direct peers

• Huber Engineered Materials: Acquired R.J. Marshall's ATH (alumina trihydrate) and Smoke Defense product lines on August 1, 2025. Huber is a major specialty mineral and filler producer directly serving cast polymer, composites, and flame retardant customers with overlapping product portfolios.
• Dorfner / ACS USA: Acquired R.J. Marshall's granite effect, Prolite, Spraylite, and fiber blend product lines. Dorfner is a German specialty minerals producer with a direct US presence serving solid surface, cast polymer, and coatings customers with highly comparable formulations.
• Michigan Additives Technologies (MAT): Acquired the Marshall Additive Technologies Flame Defense antimony trioxide product line and the Erie, MI production facility. MAT is now a direct competitor in flame retardant synergists serving thermoset and thermoplastic compounders.

Market position

Strengths2 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights5 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about The R.J. Marshall Company