Fixation of CCA and Stabilization of Current Copper Based Preservatives
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This module offers information on how the chemicals are “fixed” within the penetrated zone of the wood. The term Fixation applies mostly to the CCA chemical treatment (chromated copper arsenate), whereas stabilization is used for the stabilizing of the newer chemicals in the wood. Both terms deals with the chemicals binding to the wood and becoming as leach resistant as possible. The tests required to determine fixation/stabilization are discussed. You’re allowed to use your personal notes.
Fixation of CCA and Stabilization of Current Copper Based Preservatives
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Question 1 of 10
1. Question
Does CCA fixation start in the cylinder?
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Question 2 of 10
2. Question
What do the fastest CCA fixation rates require?
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Question 3 of 10
3. Question
Does fixation continue when the wood is removed from the fixation chamber?
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Question 4 of 10
4. Question
To fix CCA treated wood at ambient temperatures, how long does it take?
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Question 5 of 10
5. Question
What chemical is used to test for CCA fixation?
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Question 6 of 10
6. Question
If there is any purple stain on the blotting paper using the test solution, is the wood fixed?
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Question 7 of 10
7. Question
What is the PPM threshold for the test?
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Question 8 of 10
8. Question
What are the benefits of accelerated Fixation?
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Question 9 of 10
9. Question
What are the current TRD stabilization requirements for copper based preservatives?
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Question 10 of 10
10. Question
What is the name of the piece of equipment that can be used to determine the level of chemical in the leachate from fixed wood?
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