Page:NIOSH Manual of Analytical Methods - 1500.pdf/6

 HYD RO CAR BO NS, BP 36-216 °C : MET HO D 150 0, Issue 3, dated 15 M arch 200 3 -Page 6 of 8

TABLE 2. EXPOSU RE LIMITS, PPM [5-7] OSHA Substance

TW A

PEAK

NIOSH TW A

C

AC GIH TLV

STEL

m g/m 3 per ppm

cyclohexane

300

300

300

3.44

cyclohexene

300

300

300

3.36

n-decane

none

none

none

5.82

n-dodecane

none

none

none

6.97

500

85

500

50

50

3.52

500

400

400

4.01

n-nonane

none

200

200

5.25

n-octane

500

75

385

300

375

4.67

n-pentane

1000

120

610

600

750

2.95

n-undecane

none

none

n-heptane n-hexane

a

methylcyclohexane

a

440

400

500

none

The ACG IH recomm endation for other hexane isomers is: TLV 500, STEL 1000.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition

4.10

6.39