Treatment Process

FireWright Treatment Process

FireWright® treatment is applied through an impregnation process using a high-pressure autoclave. Each material that we can treat is on our classification sheet found here.

The first stage in the process, customers sending material to our treatment site in Kirkburn, Driffield. The material moisture levels are checked prior to treatment to ensure that they are below 25% (a FireWright requirement for treatment). The timber or wood-based panels are then weighed prior to treatment and then placed into the autoclave for treatment.

The length of the treatment process varies on the species of the timber with the process can take between 1.5 hours to 20 hours. Once the pressure impregnation is completed, the timber is re-stacked ready for being put into the kiln. The timber is then put into the kiln for drying. This process can take anywhere from 6 to 24 days depending on the timber species.

Throughout the kiln drying process, the timber is constantly monitored with probes to ensure optimum drying conditions. As a final check, the timber has achieved the target moisture content a small sample is taken from the batch and weighed. The sample is then placed in an oven for 16 hours. The resultant weight is then subtracted from the initial weight to confirm the actual moisture content of the timber.

When this process is finished, the timber is left for 24 hours, before being placed back into the packs it arrived in and wrapped up ready for collection/delivery.

Watch Our Impregnation Process

The video shows the impregnation of our FireWright fire retardant timber treatment into spruce boards.