Backyard Aquaponics

Wood stain/varnish
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Author:  SydneyChick [ Nov 17th, '15, 06:37 ]
Post subject:  Re: Wood stain/varnish

My understanding was that the safest pallets to use are the ones stamped with HT

This means they have been heat treated. KD or HT-KD stamp is also good as KD stands for Kiln Dried.

1001Pallets wrote:
HT: Wooden pallets manufactured in Canada or the US undergo a pest control treatment called heat treating (HT) which involves heating the pallet to minimum core temperature of 56°C for softwoods and 60°C for hardwoods for a minimum of 30 minutes in a kiln. HT pallets are not harmful to your health.

KD: The purpose of kiln-dried lumber is to reduce the moisture content of the wood (19% or less). This is a means to control warping, fungal growth and other quality features. The kilns or “ovens” the lumber is put into, doesn’t necessarily reach the sustained temperature of 133 degrees Fahrenheit (56 Celsius) that would qualify as heat treated. Many lumber mills are processing their lumber to meet the heat treatment requirements thus you will see “KD-HT” incorporated in the lumber grade stamp. With cherry and oak wood, it’s important to note that at this temperature sap will be released from within the wood. The sap will coat the wood with a dark stain, making the pallets or crates appear old and worn. In fact, the pallets and crates may actually be quite new and their strength or durability has not been compromised in any way by the HT process. KD pallets are not harmful to your health.

Link to 1001 pallets website where safety is discussed is here.

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