Industrial wood protection

Tim-bor® is an industrial, high-performance wood preservative is ideal for protecting rafters, cladding, and joinery against insects and decay.

Tim-bor professional wood treatment is the ideal protector for WPCs

Wood Treatment Designed for Maximum Solubility

Tim-bor high-performance borate wood preservative has been specially designed to provide the highest concentration of boron at the maximum possible solubility and rate of dissolution in water. Wood treated with Tim-bor can be used for a variety of purposes, such as trussed rafters, studding, cladding, and exterior joinery.


Tim-bor combines a broad spectrum of efficacy and low acute mammalian toxicity. The product has proven efficacy against wood decay fungi, wood boring beetles, and termites. In addition, it contains no organic or heavy-metal components or organic solvents.

Tim-bor has a well-known and proven record of performance in the United States, Southeast Asia, Australia, and New Zealand. The product’s performance has been demonstrated by independent laboratory and field studies carried out by universities and government testing facilities around the world. (The use of Tim-bor varies according to working requirements and country- or market-specific product labels.)

You can apply Tim-bor as a pretreatment to dry (via vacuum-pressure processes) or green (via vacuum-pressure processes or dip diffusion) timber. The ability to treat green timber successfully and the subsequent diffusion of borates in wood enables penetration of species that are known to be difficult to treat, such as Douglas fir, spruce, and many hardwoods.

Wood treated with Tim-bor retains its natural appearance and strength. Tim-bor wood treatment has little or no effect on ferrous metals, plastics, rubber, putties, bituminous solutions, other sealants, or primer paints.

Borates make excellent preservatives of wood composites because they are efficient in protecting against both fungi and insects, fire retardant at higher loadings, low cost, easy to handle, and have low toxicity and minimal environmental impact.

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Since the 1980s, Tim-bor has been used to safeguard historic mansions in the French Quarter of New Orleans, in particular, the Upper and Lower Pontalba Buildings, which comprise 120,000 square feet of architectural heritage. Termite-infested wood was replaced with Tim-bor-dipped wood, providing virtually permanent protection. Other portions of the buildings’ wood construction were treated through spraying, injection, and dusting of Tim-bor.


Available Grade Aqueous solutions of Tim-bor range from mildly alkaline (at low concentrations) to approximately neutral (at higher concentrations).

Wood treated with Tim-bor Industrial is not suitable for ground contact applications and should be protected with a water-repellent coating when used in exterior applications (eg, joinery, fascia).


Tim-Bor in Action

Borates for Wood Protection: Forest-to-Market
The wood and timber industries rely on borates for environmentally safe options for wood protection. Learn how borates protect, preserve, and extend the life ... Learn More
Building Resilience: Borates for Treated Lumber and Engineered Wood Products
In a year of disruption, the lumber industry has been on a roller coaster of demand fluctuations. Adaptations from producers—and U.S. Borax—have h... Learn More
Tim-bor: Borate Wood Treatment for the Future of Home Construction
Using borates for wood protection helps builders take advantage of wood’s carbon-reduction properties, cost-effective construction methods, and resilien... Learn More

U.S. Borax, part of Rio Tinto, is a global leader in the supply and science of borates—naturally-occurring minerals containing boron and other elements. We are 1,000 people serving 500 customers with more than 1,700 delivery locations globally. We supply 30% of the world’s need for refined borates from our world-class mine in Boron, California, about 100 miles northeast of Los Angeles.  Learn more about Rio Tinto.

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