How to identify rust stainsRust stains can look identical to tannin stains. However, there is a simple method toidentify stains associated with rust or oxidised iron. This involves applying “rust converter”to the stain. If the stain fades or disappears, the stain is caused by rust or oxidised iron. Ifthe stain is unaffected by the application of rust converter, the supplier …

Staining in FormplyThe most common stains associated with formply are: Rust stainingTannin stainingPinking – free phenol from the phenolic surface film.In the writer’s experience, most staining is due to rust deposits on the deck at the time ofpouring or iron in the aggregate. These stains appear red/brown and are often mistakenfor tannin staining.Tannin staining is the result of extractives from …

How to minimise Distortion (Bow and Twist) inFormply Do not use any new panels showing bow or twist out of the pack. Wheredistortion exceeds 30mm, these panels fail the product standard. They shouldnot be used and returned to the manufacturer.Prevent/Minimise Exposure to MoistureWhere formply panels that have been supplied flat on site distort, there is onlyone cause, this is exposure …