Common types of preservative-treated wood and their properties

Key characteristics of preservative-treated wood: 1. Natural, eco-friendly, and safe (the wood retains its natural color, with a slight greenish tint). 2. Resistant to decay, mold, insects, and termites. 3. It improves the stability of wood, which is particularly important for protecting outdoor wooden structures. 4. It is easy to coat and color, and can achieve a stunning appearance according to design requirements. 5. It can meet various design requirements and is suitable for creating high-quality garden landscapes. 6. The effect of resistance to moisture in damp soil is particularly significant; it can be used in various outdoor climate conditions for 15–50 years or more without any degradation. Types of corrosion-resistant wood: 1. European red pine, also known as Russian spruce, can be treated with high-pressure impregnation methods to protect its entire cross-section. Its excellent mechanical properties and attractive texture make it highly favored by designers and engineers. 2. Spruce-Pine-Fir (SPF): SPF grows slowly; its wood has fine fiber textures and small knots. After drying, it exhibits excellent resistance to warping and bending. Its strength is similar to that of fir, higher than that of most softwood species, and it is easy to paint and stain. The product has higher stability, and its surface is finely processed. 3. Hemlock. Tulip tree is currently the most elegant and widely used tree species in the North American market. In terms of strength, it is slightly lower than Pinus flavescens, making it suitable for use in anti-corrosion treatments. Fir wood that has undergone pressure-treated preservation is both attractive and durable, comparable to the naturally tough North American red cedar.

1. Russian spruce. Russian spruce can be subjected to full-section anti-corrosion treatment using the high-pressure impregnation method; its excellent mechanical properties and attractive grain pattern make it highly favored by designers and engineers. Preserved Siberian spruce from Russia has a very wide range of applications; it can be used in wooden walkways, platform areas for pavilions, pavilions and towers, waterside corridors, flower racks and fences, walkways and piers, children’s play areas, flower beds, trash bins, outdoor furniture, as well as in outdoor environments, water-related settings, and both indoor and outdoor structures. Thanks to its unique anti-corrosion process, all architectural works can remain intact for a long time. 2. Yellow pine (Southern pine). The yellow pine (southern pine) has the best strength and specific gravity, along with excellent nail-holding capacity; it is the softwood with the highest strength in the West. Fir that has undergone anti-corrosion and pressure treatment allows the preservative to reach the core of the wood. It can be cut arbitrarily during installation, and no anti-corrosion coating is required on the cut surface. The product can be used in seawater or river water without any risk of corrosion. 3. Nordic red pine. High-quality European red pine, after special anti-corrosion treatment, has the properties of preventing decay, termites, and fungi. Designed specifically for outdoor environments, it can be used directly in areas in contact with water and soil, making it the preferred material for wooden floors, fences, bridges, walkways, and other wooden elements in outdoor garden landscapes. 4. Western red cedar. Western red cedar is the highest-grade preservative-treated wood in North America. Its excellent anti-corrosion properties stem from an alcohol compound called Thujaplicins that is produced naturally ； Additionally, an acidic substance called Thujic, which can be extracted from red cedar, prevents the wood from being damaged by insects, eliminating the need for artificial preservatives or pressure treatment. Red cedar has excellent stability, a long service life, and is not prone to deformation. It is also suitable for high-humidity environments such as saunas, bathrooms, and kitchens, and can be used to make cabinets, wardrobes, etc. that are resistant to cockroaches and moths. Red cedar is highly popular in the global market due to its lack of chemical treatment and natural properties.

This post was last edited by zgj2405 on 2009-11-7 at 22:57. Preserved wood is wood to which preservatives have been infused and cured, thereby endowing it with the ability to resist decay caused by fungi as well as biological attacks. 　 Early treated wood used CCA-C and B wood preservatives; although these preservatives are somewhat toxic, their hazards are reduced since they are used only outdoors. Today, there are ACQ-D, C, and B wood preservatives available. Wood treated with these preservatives meets environmental standards, and their toxicity is **reduced**, so people can purchase them with confidence. Currently, the main preservatives are CCA, ACQ, and CAB. CCA is primarily composed of copper arsenite, ACQ is mainly made up of copper alkylamine hydroxide, and CAB is primarily composed of copper azide. How is pressure-treated wood made? In simple terms, wood is processed and then placed in a sealed pressure-treated tank; vacuum pressure is used to force the preservative into the wood. The preservative penetrates the cellular structure of the wood and binds tightly to its fibers, thereby achieving the purpose of preventing decay. There are mainly three types of treated wood: the most common type is one in which preservatives are used to make the wood resistant to decay and biological attacks. I call it: chemically treated preservative wood ； Preserved wood that uses preservatives for protection; the most commonly used preservatives are CCA, ACQ, and CAB. Another type is preserved wood without any preservatives, known as deeply carbonized wood. Deeply carbonized wood, also known as heat-treated wood. Charred wood is obtained by carbonizing the essential nutrients in wood, thereby breaking the nutrient chain on which decay-causing fungi depend and achieving antiseptic effects. Another option is special types of wood that are purely natural and have not undergone any treatment: 1. Nordic red pine. High-quality European red pine, after special anti-corrosion treatment, has the properties of preventing decay, termites, and fungi. Designed specifically for outdoor environments, it can be used directly in areas in contact with water and soil, making it the preferred material for wooden floors, fences, bridges, walkways, and other wooden elements in outdoor garden landscapes. 2. Russian spruce. Russian spruce can be subjected to full-section anti-corrosion treatment using the high-pressure impregnation method; its excellent mechanical properties and attractive grain pattern make it highly favored by designers and engineers. Preserved Siberian spruce from Russia has a very wide range of applications; it can be used in wooden walkways, platform areas for pavilions, pavilions and towers, waterside corridors, flower racks and fences, walkways and piers, children’s play areas, flower beds, trash bins, outdoor furniture, as well as in outdoor environments, water-related settings, and both indoor and outdoor structures. Thanks to its unique anti-corrosion technique, all architectural works can be preserved for a long time. 3. Western red cedar. Western red cedar is the highest-grade preservative-treated wood in North America. Its excellent anti-corrosion properties stem from an alcohol compound called Thujaplicins that is produced naturally ； Additionally, an acidic substance called Thujic, which can be extracted from red cedar, prevents the wood from being damaged by insects, eliminating the need for artificial preservatives or pressure treatment. Red cedar has excellent stability, a long service life, and is not prone to deformation. It is also suitable for high-humidity environments such as saunas, bathrooms, and kitchens, and can be used to make cabinets, wardrobes, etc. that are resistant to cockroaches and moths. Red cedar is highly popular in the global market due to its lack of chemical treatment and natural properties. 4. Yellow pine (Southern pine). The yellow pine (southern pine) has the best strength and specific gravity, along with excellent nail-holding capacity; it is the softwood with the highest strength in the West. Fir that has undergone anti-corrosion and pressure treatment allows the preservative to reach the core of the wood. It can be cut arbitrarily during installation, and no anti-corrosion coating is required on the cut surface. The product can be used in seawater or river water, and it will not corrode at all. 5. Additionally, wood contains many natural anti-corrosion materials ； Materials such as Liu’an, Borog, and Camphor Wood.

There are mainly three types of treated wood: the most common type is one in which preservatives are infused into the wood to give it the ability to resist decay and biological attacks. I call it: chemically treated preservative wood ； Another type is preservative-free treated wood, known as deeply carbonized wood. There is also a type that consists of special wood varieties that are purely natural and have not undergone any processing. Preserved wood treated with preservatives is widely used; the most common preservatives employed are CCA, ACQ, and CAB. CCA consists mainly of copper arsenate, ACQ is primarily composed of copper alkylamine hydroxide, while CAB is mainly made up of copper zinc oxide. Although the preservative CCA is somewhat toxic, its hazards are minimal since it is used outdoors. Preserved wood processed with the preservative acq meets environmental standards; it has very low toxicity and can be used with confidence. Deeply carbonized wood, also known as heat-treated wood. Charred wood involves carbonizing the essential nutrients in wood, thereby breaking the nutrient chain on which decay-causing fungi depend and achieving antiseptic effects. This wood that has been treated using carbonization techniques at temperatures over 200 degrees is deeply carbonized to achieve anti-corrosion properties; it is a true green and environmentally friendly product. Although it possesses anti-corrosion and insect-resistant characteristics, it does not contain any harmful substances, making it a genuine green building material that is eco-friendly in terms of anti-corrosion performance. It is purely natural, untreated preservative-free wood; it relies on an enzyme contained within it to emit a special fragrance in order to achieve preservation. This type of naturally preservative-treated wood is also the most expensive among these types of preservative-treated woods. Currently, the ones available on the market are mainly red cedar from Canada and the United States, also known as red cypress ； The agarwood from Indonesia and Malaysia is commonly known as sandalwood.

Types of treated wood: 1. CCA-treated wood 2. ACQ-treated wood 3. Charred wood 4. Russian spruce 5. Southern pine from the United States 6. Spruce that is resistant to water and cracking 7. Pine that is resistant to water and cracking. I. Principle of treatment: In the natural environment, wood is prone to issues such as insect infestation, decay, mold growth, and color changes. Using specialized equipment, preservatives are injected into the wood cells, where they bind tightly to them. This process completely alters the existing ‘nutrients’ in the wood fibers, protecting them from damage caused by fungi, molds, and pests, thereby extending the lifespan of the wood. II. Characteristics of treated wood: 1. Naturally beautiful, environmentally friendly, comfortable, and safe and sturdy ； 2. Prevents corrosion, mold, insects, and pests; enhances wood stability and extends its outdoor service life ； 3. Among strength, impact toughness, and adhesion properties, it has strong nail-holding capacity ； 4. Easy to manufacture, apply paint to, and color, enabling the achievement of aesthetic ideals ； 5. It performs even better in harsh environments; with proper maintenance, it can last over 30 years when used outdoors.