Which material is most resistant to hard growth.

[Dave_S]

I want to machine up some guides and runners that will be permanently below the waterline. I like the plastics for weight and cost and ease of machining.

I'm familiar with materials such as acetyl but I'm not sure about hard growth, I think soft growth will self clean as the runners travel but hard growth may jamb.

Does anyone know of any data on this.

TIA
Dave

[tamicatana]

PTFE?

[Simi 60]

Some plastics swell if continually immersed.
Worth "bearing" in mind