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Article 17 - The differing strengths of timber treatment fluids |
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Articles
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Not all timber treatment fluids have the same working strength - some have 100% less active ingredient than others. This article contains a table to help you work out the differing strengths.
The differing strengths of timber treatment fluids
Not all timber treatment fluids have the same working strength – some have 100% less active ingredient than others from which you may draw your own conclusions. Most timber treatment fluids sold to the building preservation treatment industry are sold as a concentrate for dilution with water but because of the differing pack sizes it is difficult to work out what the ready to use strength is. Below is a table to enable you to see how much active ingredient you are buying or will be in the material applied to your property. I personally would use an insecticide with a ready to use strength of 0.2% to treat Common Furniture Beetle (woodworm).
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Concentrate
Container size
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% of active ingredient declared on the concentrate pack
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1.25% w/w
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2.5% w/w
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5% w/w
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5.9% w/w
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0.5 litre
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0.03
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0.05
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0.10
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0.12
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0.85 litre
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0.04
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0.09
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0.17
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0.20
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1.0 litre
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0.05.
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0.10
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0.20
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0.24
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1.5 litre
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0.08
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0.15
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0.30
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0.35
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2.0 litre
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0.10
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0.20
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0.40
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0.47
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2.5 litre
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0.13
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0.25
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0.50
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0.59
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Ready to use strength once diluted expressed in % terms
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NOTE:
1. The above table assumes dilution with water to make 25 litres of ready to use product
2. The above table works for insecticides and fungicides but not borates.
3. w/w means weight by weight. For example 2.5% w/w active ingredient content means it is 2.5% of the total weight of the pack contents thus the % w/w is directly relevant to the pack size.
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