(800) 338-7900

richard and joan marshallThe R.J. Marshall Company was founded by Richard J. and Joan E. Marshall in May of 1978. Originally conceived as a manufacturer representative company, R.J. Marshall sold commodity grade industrial raw materials. Soon, they found a way to offer a solution to the inconsistent quality of materials drawn from individual mines: a better way to achieve the best possible properties from batch to batch. This kind of consistency and quality has been the hallmark of the R.J. Marshall reputation even today.

Offering a broad base of products to both the cast polymer and composites markets as well as the wire and cable industry, R.J. Marshall with its flame retardant and smoke suppressant division; Marshall Additive Technologies, and its subsidiary; Marshall Gruber Company, can service a full range of solutions to manufacturers for a variety of applications.
For more information about available products for your needs, please see our Products & Applications page.

Corporate Brochure

About Us

Our Vision

To be a world leader providing specialty, industrial raw materials and manufacturing supplies; being directed by our core values, quality policy and focused on our mission.

Our Mission

At The R.J. Marshall Company we seek to make our customers successful by supplying innovative, quality focused products and services. We serve our customer’s needs with perseverance and create an environment where our customers, employees and suppliers are highly valued.

Commitment to Quality

The R.J. Marshall Company quality policy is to achieve customer satisfaction by assuring that each product delivered or service provided will consistently meet or exceed the established standards. As part of our dedication to quality, The R.J. Marshall Company will:

  1. Develop and nurture an environment conducive to the highest standards of quality,
    commitment and continuous improvement.
  2. Partner with and monitor our vendors and suppliers to obtain the most consistent and
    highest quality materials and services.
  3. Use statistical methods to understand and manage the actions of our total organization.
  4. Dedicate ourselves to continuous improvement in all activities of our business.
  5. Continually strive to develop our employees through training and education.
  6. Quality will be achieved through prevention of defects rather than detection.

Our Core Values

The R.J. Marshall Company was founded in 1978 and stands as a reminder of the business principles:

Integrity – to maintain the highest ethical standards.

Honesty – to be honorable and trustworthy, to always do the right thing.

Respect – to show regard for worth, honor and esteem for our employees, customers and suppliers.

Perseverance – to have a passion for excellence and a resolve for continuous improvement.

Knowledge – to be lifetime learners and provide a continual learning environment empowering
our employees to solve problems.

Forgiveness – to create an environment of trust where people are allowed to fail.

Fairness – to treat all people in a just and equitable manner.

Teamwork – to work together with mutual respect and courtesy realizing we can achieve
more by working together.

Competence – to do it right the first time by making smart, quick, common sense decisions.

Family – to recognize and support the family and maintain a family atmosphere.

RJM Locations


26776 W. 12 Mile Road
Southfield, MI 48034

P: 248-353-4100
F: 248-948-6460
Toll Free: 800-338-7900

Customer Service:
Toll Free PH: 888-514-8600
Toll Free Fax: 877-717-5577

erie michigan
Erie, Michigan

Flame Retardant Products
Onyx Fill, Dense Fill
Ground Bayer Hydrate

Rockwood, Michigan

Granule Manufacturing
Granite Effect
Lightweight Fillers
Buffing & Polishing


Alpine, Alabama

Ground Bayer Hydrates
Granite Effect
Lightweight Fillers


Valley Springs, California

Lightweight Fillers
Bayer Ground Hydrates
West Coast Distribution
of all RJM Products

Marshall Gruber Location


Mansfield, Texas

Manufacturing & Distribution

P: 682-422-9674
F: 682-518-9762

Customer Service:
Toll Free: 866-260-6457


The R.J. Marshall Company exports its products all across the world. Call or email Customer Care for more information.