1.The anti-corrosion of wood is to treat the commercial wood to prevent the wood from spoilage caused by fungi and the wood from being eaten by insects such as termites, so as to prolong the service life of the wood.

2. When did the wood treated with CCA preservative begin to be used in the United States? When did the technology of "CCA" and "ACQ" be adopted in China?

The United States has used CCA wood preservative to treat wood for more than 70 years, and "CCA" was only popularized in China in the 1980s. "ACQ" was introduced, researched and applied at the beginning of the 21st century.

3. Why does wood deform and crack?

Wood products produced by wood processing with high moisture content will be deformed and cracked. Although some water sealing coatings can temporarily delay this phenomenon, because they do not solve the root cause of excessive moisture in the wood, the final moisture will break through the protective layer of the coating and cause more serious cracking. The way to improve this phenomenon is to use anticorrosive materials with a moisture content of less than 20%, but the second drying may require additional time and cost.

4. Why is wood deformation and cracking related to moisture content?

Wood deformation and cracking are caused by internal stress. The fundamental reason for this change is that the moisture content of wood has changed. Since the wood is composed of many rings, and the age of the rings on the two surfaces of the rotary cut plate is not equal, it can be vividly said that the older one reflects the water slowly, while the younger one reflects the water quickly. Therefore, under the same conditions, the surface area of the older side changes less than that of the younger side. Because the wood has no ductility, the side with reduced area can only increase the surface area by cracking to maintain balance. So we say that cracking and deformation are closely related to the moisture content of wood.

5. How to sample when testing samples?

The test sample shall be taken in the middle of the length direction of the wood. When determining the specific position, knots, cracks and stress wood shall be avoided. After the position is determined, cross the wood to take the middle wood block or drill the wood core with a hollow drill.

6. How to determine the number of tests?

The number of test samples shall be determined by taking the wood of the same tree species and the same thickness in each tank of anti-corrosion treatment as a batch. Each batch of wood treatment volume is less than 5M3, and 5 samples are taken. Each batch of wood processing capacity ≥ 5M3, 10 samples shall be taken.

7. Why can CCA preservative prevent corrosion?

The reason why the arsenic agent CCA can resist corrosion is that it is impregnated into the wood to form insoluble compounds in the wood fibers, thus making the wood become inedible substances for wood destroyers such as fungi, termites and moths, and making the wood not easy to decay and moth.

8. What are the advantages of CCA preservative?

CCA wood preservative is a soluble double salt of chromium copper arsenic oxide, which is more remarkable than other wood preservatives. Its advantages are:

(1) Wide range of applications It is applicable to ground, underground, indoor, outdoor, seawater and fresh water. It can not only control common wood rot fungi, but also control wood boring insects such as termites.

(2) , good anti-corrosion effect. It can prolong the service life of wood by 5-10 times. It is a wood preservative with internationally recognized antiseptic effect.

(3) The wood treated by CCA is odorless, tasteless and easy to process and paint.

(4) The cost of arsenic agent is low, and it will not cause secondary pollution. The treated wood is not toxic to people and animals.