Celluloid Gas Out

[popcornpicker]

Has anyone else heard of this? Is this the reason some celluloid handles look like the air has been let out of them? Supposedly, petroleum based products accelerate the decomposition of celluloid. Does this mean the old knives I cleaned with WD-40 and oiled are going to shrivel up, or is fifty years a test of good material? I've heard of this happening with some brands of knives within a few years. Any input would be appreciated.

 

[HoB]

Mmmh, no I don't think that is outgases. Celluloid is essentially solid rocket fuel (that is slightly exaggerated but it is close enough to make the point) and as such Celluloid can spontaneously decompose, which is why it is rarely used anymore. I would think that heat and exposure to sunlight would accelerate or increase the chances of decomposition. However, there are plenty of examples of preserved items that are 50-100 years old so the chances are good that it will last. I would think that the manufacturing processes were not yet so tighly controlled. I would assume that it is a good deal of luck how well celluloid lasts. It is not very resistant to petrochemicals, so I would avoid overexposure. I would think a wipedown with WD-40 is not much of a problem, especially if you wipe excess of. But no guarantees.

 

[Bill DeShivs]

Celluloid definitely does outgas when it starts to break down. The fumes will rust blades badly. If you notice degradation, separate the knife from others, and break the handles off if possible.