Table 3.

Protection class (PC) and protection level (PL) for elastomeric half-facepiece (EHR), full-facepiece, and powered air-purifying (PAPR) respirators using the Second Highest TIL Method ^ISO.

Respirator	Model	Aerosol	GM Fit Factor	GM TIL (%)	GSD	Second Highest TIL (%)	PC	PL
EHR	A	NaCl	1507	0.056	5.57	0.614	3	30
		Corn oil		0.197*	4.03	1.048	2	10
	B	NaCl	1667	0.038	6.48	0.799	3	30
		Corn oil		0.086*	9.19	1.852	2	10
Full-facepiece	C	NaCl	4670	0.049	2.22	0.128	3	30
		Corn oil		0.046	1.84	0.089	4	250
	D	NaCl	7753	0.016	1.84	0.054	4	250
		Corn oil		0.015	3.20	0.064	4	250
PAPR	E	NaCl	7731	0.010**	1.57	0.021	4	250
Tight-fitting		Corn oil		0.003	3.31	0.003	5	2000
	F	NaCl	3799	0.011 **	1.52	0.019	4	250
		Corn oil		0.002	1.53	0.019	4	250
PAPR	G	NaCl	N/A	0.013**	1.83	0.026	4	250
Loose-fitting		Corn oil		0.003	2.83	0.022	4	250
	H	NaCl	N/A	0.015**	2.27	0.026	4	250
		Corn oil		0.002	1.47	0.003	5	2000

ISO ISO/CD (2018) recommended method.

^*Significantly larger for corn oil aerosol than for NaCl aerosol.

^**Significantly larger for NaCl aerosol than for corn oil aerosol.