- Wolmanized Pressure-Treated Wood
 - Poles, piles, timber, posts, and plywood pressure-treated with CCA preservative to provide structural protection from termites and fungal decay. - Osmose, Inc.
- Offers utility pole inspection, treatment and, restoration. Also produces pressure-treated wood products.
- Chemical Specialties Inc.
- Supplier of wood protection technology, offering information about treated wood products.
- Dricon
- Offers fire retardant treated wood containing a chemical that remains stable in high temperature environments and does not increase the corrosivity of metal hardware in contact with the wood.
- Hoover Treated Wood Products, Inc
- Manufactures pressure-treated and fire retardant-treated lumber and plywood.
- Northern Crossarm, Co.
- Producer of ACQ-treated lumber.
- Conrad Wood Preserving Co.
- Offers pressure treated lumber and poles and pilings.
- J. H. Baxter & Co.
- Supplier of chemical and pressure treated wood.
- Exterior Wood, Inc.
- Manufacturer of treated wood and decking products.
- Great Southern Wood Preserving, Inc.
- Produces pressure-treated lumber.
- Wood Treaters, Inc.
- Producing pressure treated forest products, including lumber, timbers, poles, plywood, timber piling, and vinyl sheeting.
- Flameproof Companies
- Manufacturer of fire retardant lumber and plywood, CCA and ACQ treated lumber, liquid fire retardants, fireproofing products, and related building materials. Also located in Wisconsin and North Texas.
- Follen Wood Preserving Co. Inc.
- Producers of pressure treated Southern yellow pine timbers, lumber, and plywood.
- Burke-Parsons-Bowlby Corporation
- Producer of treated wood products primarily for the railroad, highway guard rail construction, and agricultural industries.
- Lumber-One
- Specializes in pressure-treated, fire-retardant lumber and hardwoods. Products and services include: pallets, remanufacturing, and blocking.
- Atlantic Wood Industries, Inc.
- Produces pressure treated forest products including including utility poles, timber piling, structural lumber, and vinyl sheeting.
- Preschem Pty Ltd
- Manufactures preservative products for the protection of wooden poles and timber structures from decay, rot, and termites.
- Preserva Ltda.
- Produces treated posts, utility poles, and timber for commercial and industrial use.
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