Martin Marietta Magnesia Specialties

What Martin Marietta Magnesia Specialties does

Martin Marietta Magnesia Specialties is a subsidiary of Martin Marietta (NYSE: MLM, S&P 500) that manufactures high-purity magnesia and dolomitic lime products for industrial, agricultural, environmental, and specialty applications. The company operates two primary manufacturing facilities: a magnesia plant in Manistee, Michigan — the only U.S. facility producing high-purity synthetic magnesium hydroxide slurry from natural brine — and a dolomitic lime plant in Woodville, Ohio, recognized as the largest high-purity dolomitic lime operation in North America. It is also North America's largest producer of synthetic high-purity dead burned magnesium oxide (Periclase). The product portfolio is organized under nine branded lines (FloMag, MagChem, MagShield, CellGuard, Elastomag, UtiliMag, Versamag, Marinco, CropMag) covering magnesium hydroxide slurries and powders, light/hard/dead burned magnesium oxide grades, specialty oxides, and dolomitic lime, with grades engineered through calcination at 700°C to 2000°C to deliver targeted reactivity profiles.

The company's proprietary technology base includes patented processes for stabilized slurry, high-solids production, and balanced quality — enabling long-distance transport of magnesium hydroxide slurry by tank truck or railcar and minimizing shipping costs. Manufacturing is supported by ISO 9001:2015 certification across all locations, NSF Standard 60 certification for drinking water chemicals, and FCC compliance for food-grade magnesium oxide. Revenue is generated through direct sales of industrial chemical products (hardware sales model) via a sales-led GTM with regional sales managers covering nine geographic territories, application engineers providing technical support, and a global chemical distributor network shipping to 35+ countries across six continents via truck, rail, sea, and air freight. Customer end markets are horizontally diversified across water and wastewater treatment, steelmaking and refractories, pulp and paper, flame retardants, agriculture, food and nutraceuticals, mining and hydrometallurgy, electrical steel, and glass manufacturing. Pricing is quote-based with no public disclosure of price lists. In July 2025, the division expanded via the acquisition of Premier Magnesia to strengthen North American refractory operations.

Name

Martin Marietta Magnesia Specialties

Legal name

Martin Marietta Magnesia Specialties

Website

https://magnesiaspecialties.com

Company type

Private

Founded year

1961

Operating status

Operating

Headcount range

11–50 employees

Short description

Martin Marietta Magnesia Specialties, a subsidiary of Martin Marietta (NYSE: MLM), manufactures high-purity magnesia and dolomitic lime products for industrial, environmental, agricultural, and specialty applications, serving global customers across water treatment, steelmaking, pulp and paper, and other sectors.

Ownership category

akta.pro rank

NAICS

Ground or Treated Mineral and Earth Manufacturing (327992), Lime Manufacturing (32741), Lime Manufacturing (327410)

SIC

Industrial Inorganic Chemicals (2810), Abrasive, Asbestos & Misc Nonmetallic Mineral Prods (3290)

akta.pro primary industry

Magnesite & Magnesium Minerals (IMAEAFAL)

Keywords

• Magnesium oxide manufacturing
• Magnesium hydroxide slurry
• Dolomitic lime products
• Industrial magnesia chemicals
• Refractory steelmaking materials

Headquarters

HQ city

Baltimore

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Magnesium Hydroxide Products: High purity synthetic magnesium hydroxide slurry and powder products sold under brand names FloMag, CellGuard, MagShield, Versamag, UtiliMag. Used in wastewater treatment, pulp/paper, flame retardants, and other industrial applications. Revenue generated through direct sales and distribution partnerships.
2. Magnesium Oxide Products: Wide variety of magnesium oxide products including light burned, hard burned, dead burned, and specialty grades. Sold under MagChem, Elastomag, Marinco brands. Used in refractories, steelmaking, electrical steel, food grade, and specialty industrial applications.
3. Dolomitic Lime Products: High purity dolomitic lime products manufactured at Woodville, Ohio facility. Available in pebble, midsize, granular and milled grades. Primarily used as fluxing agent in steelmaking, glass manufacturing, and soil stabilization.

Go-to-market motion1 record

Distribution channels6 records

Marketing channels6 records

Core offering

Martin Marietta Magnesia Specialties manufactures and sells high-purity magnesium oxide, magnesium hydroxide, and dolomitic lime products for industrial, environmental, and specialty applications. Products are sold under brands including FloMag, MagChem, MagShield, CellGuard, Elastomag, Marinco, Versamag, UtiliMag, and CropMag, serving water/wastewater treatment, refractory and steelmaking, pulp and paper, flame retardancy, food/nutraceutical, agriculture, power generation, mining, glass, and electrical steel markets globally.

Product overview

Martin Marietta Magnesia Specialties is a chemical manufacturing company offering a diversified portfolio of high purity magnesia and dolomitic lime products. The company's core offerings include three main product lines: Magnesium Oxide (available as light burned, hard burned, dead burned, and specialty grades under the MagChem® brand family including Elastomag®, FloMag®, and Marinco®); Magnesium Hydroxide (offered as slurry and powder forms under FloMag®, MagShield®, CellGuard®, and UtiliMag® brands); and Dolomitic Lime (manufactured at the Woodville, Ohio facility under the DoloTech™ brand). These products serve diverse industrial applications including wastewater treatment, steelmaking, pulp & paper, flame retardancy, agriculture, power generation, mining/hydrometallurgy, glass manufacturing, and food/pharmaceutical ingredients. The company positions its products as alternatives to hazardous chemicals like caustic soda and lime, emphasizing safety, environmental friendliness, and superior alkalinity contribution.

Differentiator

Problem solved

Functional benefit

Brands

• MagChem: Brand name for magnesium oxide products including light burned, hard burned, dead burned, and specialty grades (e.g., MagChem 10, MagChem 40, MagChem P98, MagChem 20 SC, MagChem 200 AD).
• FloMag
• MagShield
• CellGuard
• Elastomag
• UtiliMag
• Versamag
• Marinco
• CropMag
• Dolomitic Lime (Dolime)

Quantifiable outcome

• One gallon of FloMag H replaces 1.77 gallons of 50% caustic soda on equal alkalinity basis
• +7 more outcomes

Segments11 records

Ideal customer profiles8 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Global Chemical Distributors NetworkcoreChannel Partner/ Reseller/ DistributorLong standing partnerships with a vast network of global chemical distributors allow placement of Martin Marietta Magnesia Specialties products in distant geographies including North America, South America, Europe, Asia, Africa and Australia. This distribution network enables global reach beyond direct sales territories.

Scale indicators6 records

Recent moves5 records

Expansion highlights5 records

Broad incumbents

• Graymont: One of North America's largest lime producers (high-calcium and dolomitic lime) for steel, construction, environmental, and industrial uses. Directly comparable on the dolomitic lime side of MMMS's business (Woodville plant's main product line).
• Carmeuse: Global lime and limestone producer with significant North American operations serving steel, flue gas treatment, water treatment, and construction. Comparable on the dolomitic lime product line and overlapping industrial customer base.
• RHI Magnesita: The world's largest refractories producer, with integrated magnesia mining and a broad product portfolio across dead burned MgO, fused MgO, and refractory bricks. Comparable as a global magnesia/refractories incumbent; differs in scale, vertical integration into raw magnesite mining, and end-market breadth (broader than MMMS's specialty focus).
• Magnezit Group: Russian-headquartered, one of the world's largest producers of refractory products and a major miner/processor of magnesite. Comparable as a globally integrated magnesia/refractories player, though the asset base is mined magnesite rather than synthetic brine-based production.

Direct peers

• HarbisonWalker International: Largest US-based manufacturer of refractory products and services, serving steel, glass, cement, and other heavy industries. Comparable as a North American refractories player with overlapping customer base in steel and industrial end markets.
• Refratechnik: German-headquartered global refractories producer with magnesia-based product lines serving steel, cement, glass, and non-ferrous metals. Comparable as a specialty magnesia/refractories competitor with overlapping customer base in heavy industry.
• Premier Magnesia: US-based producer of magnesium oxide and magnesium hydroxide products serving refractory and industrial markets. Acquired by Martin Marietta Magnesia Specialties in July 2025, Premier Magnesia was a direct North American competitor in magnesia chemicals and is now part of MMMS.
• Tateho Chemical Industries: Japanese manufacturer of magnesium oxide and other specialty ceramic raw materials for electrical, refractory, and industrial applications. Directly comparable in MgO product portfolio (light burned, hard burned, dead burned grades) serving similar end markets.
• Nedmag: Netherlands-based producer of high-purity magnesium hydroxide and magnesium oxide from underground brine reserves. The most direct process-comparable peer: synthetic Mg(OH)2 from natural brine is essentially the same manufacturing approach as MMMS's Manistee plant, serving overlapping water/wastewater and industrial applications.

Regional players

• Lehmann&Voss&Co. Hamburg, Germany-based specialty chemicals distributor and producer of magnesia-based compounds for industrial applications. Comparable in magnesia product offerings, but primarily European in geographic focus and structured as a specialty compounder/distributor rather than integrated manufacturer.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/martin-marietta-magnesia-specialties-llc

Compliance3 records

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 Martin Marietta Magnesia Specialties