What are the substances used for the preservation of wood before its use (ex situ) and for already installed wood (in situ)? I- For ex situ use, C...
What are the substances used for the preservation of wood before its use (ex situ) and for already installed wood (in situ)?
I- For ex situ use, CCA 'C' salts are used for interiors and exteriors (risk classes 1 to 5) and boron salts for interiors (risk classes 1 and 2).
II- For in situ use, boron salts, pyrethrins, permethrins, among others, are used for interiors and tributyl tin oxide for exteriors.
III- In Mexico, substances such as linseed oil, petroleum, preventol, and aluminum phosphide are used for non-structural wood, while substances such as chapopote, petroleum, and burnt oil are used for structural wood.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I and III are correct.
I- For ex situ use, CCA 'C' salts are used for interiors and exteriors (risk classes 1 to 5) and boron salts for interiors (risk classes 1 and 2).
II- For in situ use, boron salts, pyrethrins, permethrins, among others, are used for interiors and tributyl tin oxide for exteriors.
III- In Mexico, substances such as linseed oil, petroleum, preventol, and aluminum phosphide are used for non-structural wood, while substances such as chapopote, petroleum, and burnt oil are used for structural wood.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I and III are correct.
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💡 1 Resposta
Ed 
A alternativa correta é a letra "e) I and III are correct." As substâncias usadas para a preservação da madeira antes de seu uso (ex situ) são sais de CCA "C" para interiores e exteriores (classes de risco 1 a 5) e sais de boro para interiores (classes de risco 1 e 2). No México, substâncias como óleo de linhaça, petróleo, preventol e fosfeto de alumínio são usadas para madeira não estrutural, enquanto substâncias como chapopote, petróleo e óleo queimado são usadas para madeira estrutural.
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