Apple Support:
The LaserWriter drum is an organic photo-conductive layer laid on the surface of an aluminum cylinder. The ingredients of the organic layer are:
wt% OSHA (PEL) ACGIH (TLV)
aluminum alloy 95.0-98.0 - -
titanium dioxide
(13463-67-7) 0.5-2.0 * 15mg/m3(TWA) 10mg/m3(TWA)(Dust)
(20mg/m3)(Stel)
Binder resin 0.5-2.0 - -
Organic semiconductor 0.3-0.8 - -
Carcinogens: no ingredient is listed on the latest NTP Annual Report on carcinogens, IARC Monograph, or OSHA listing.
I have no idea what any of this means.