Table IX

Extracted Elemental Impurities Reported for Polymethylmethacrylate (PMMA)

Element	Concentration (mg/kg unless noted)	Extraction Details		Comments	Ref.
Element	Concentration (mg/kg unless noted)	Solvent	Conditions	Comments	Ref.
Al	NR^¹, 0.30	Low pH (≈3)	Sealed vessel, 55 °C for 4 days, 0.1 g sample/mL solvent	2 materials tested; resins, parts^³	12
	NR	High pH (≈9)
	NR, 1.5	Ethanol/water
B	NR–0.39	Low pH (≈3)
	NR	High pH (≈9)
	0.40, 0.69	Ethanol/water
Ca	0.60, 1.2	Low pH (≈3)
	NR, 0.99	High pH (≈9)
	NR, 2.6	Ethanol/water
Mg	0.001	3% acetic acid	Sealed vessel, 40 °C for 10 days, 0.15 g sample/mL solvent	Total pool = 5.2 mg/kg	21
Na	NR, 0.49	Low pH (≈3)	Sealed vessel, 55 °C for 4 days, 0.1 g sample/mL solvent	2 materials tested; resins, parts^³	12
	NA^²	High pH (≈9)
	NR, 8.9	Ethanol/water
P	NR	Low pH (≈3)
	NA	High pH (≈9)
	NR, 1.8	Ethanol/water
S	NR, 0.59	Low pH (≈3)
	NR, 2.0	High pH (≈9)
	NR, 23	Ethanol/water
Si	0.89, 2.6	Low pH (≈3)
	0.30, 18	High pH (≈9)
	1.9, 40	Ethanol/water
Zn	0.004	3% acetic acid	Sealed vessel, 40 °C for 10 days, 0.15 g sample/mL solvent	Total pool = <1 mg/kg	21

Notes:
↵1 NR = Not reported: not extracted at reportable levels (generally less than 0.01 μg/g).
↵2 NA = Not applicable; element was a component of the extracting solvent.
↵3 Elements that were not extracted in reportable levels included Ag, As, Ba, Be, Bi, Cd, Co, Cr, Cu, Fe, Ge, Li, Mn, Mo, Ni, Pb, Sb, Se, Sn, Sr, Ti, V, and Zr.