| Industron FF44 | 1 | 1 | 4 | 1 | 1 | 2 |
| Industron FF48 | 1 | 1 | 4 | 1 | 1 | 2 |
| Industron FF53 | 1 | 1 | 4 | 1 | 1 | 2 |
| Industron FF80 | 1 | 1 | 4 | 1 | 1 | 2 |
| Iodine Pentafluoride | 4 | 4 | 4 | 4 | 4 | 4 |
| Iodine | 1 | 1 | 2 | 2 | 1 | 4 |
| Isobutyl Alcohol (Isobutanol, Isopropyl Carbinol) | 1 | 1 | 1 | 2 | 2 | 2 |
| Isobutyl Chloride | 4 | 1 | 4 | 4 | 4 | 4 |
| Isobutyl Ether | 4 | 4 | 4 | 2 | 2 | 3 |
| Isobutyraldehyde | 4 | 4 | 2 | 3 | 2 | 3 |
| Isobutyric Acid | 3 | 4 | 2 | 2 | 2 | 4 |
| Isododecane | 1 | 1 | 4 | 1 | 1 | 2 |
| Isophorone | 2 | 4 | 1 | 4 | 4 | 4 |
| Isopropanol | 1 | 1 | 1 | 2 | 2 | 2 |
| Isopropyl Acetate | 4 | 4 | 2 | 4 | 4 | 4 |
| Isopropyl Alcohol | 1 | 1 | 1 | 2 | 2 | 2 |
| Isopropyl Chloride | 4 | 1 | 4 | 4 | 4 | 4 |
| Isopropyl Ether | 4 | 4 | 4 | 2 | 2 | 3 |
| Jet Fuel JP3 (MIL-J-5624) | 2 | 1 | 4 | 1 | 1 | 4 |
| Jet Fuel JP4 (MIL-J-5624) | 2 | 1 | 4 | 1 | 1 | 4 |
| Jet Fuel JP5 (MIL-J-5624) | 2 | 1 | 4 | 1 | 1 | 4 |
| Jet Fuel JP6 (MIL-J-25656) | 2 | 1 | 4 | 1 | 1 | 4 |
| Jet Fuel JP8 | 2 | 1 | 4 | 4 | 1 | 4 |
| Jet Fuel JPX (MIL-F-25604) | 2 | 4 | 4 | 1 | 1 | 2 |
| Kel-F Fluids | 3 | 2 | 1 | 1 | 1 | 2 |
| Kerosene | 2 | 1 | 4 | 1 | 1 | 2 |
| Keystone 87 HX, Grease | 1 | 1 | 4 | 1 | 1 | 4 |
| Lacquer Solvents | 4 | 4 | 4 | 4 | 4 | 4 |
| Lacquers | 4 | 4 | 4 | 4 | 4 | 4 |
| Lactams (Amino Acids) | 3 | 4 | 2 | 4 | 4 | 2 |
| Lard, Animal Fat | 1 | 1 | 2 | 1 | 1 | 2 |
| Lavender Oil | 1 | 1 | 4 | 2 | 2 | 4 |
| LB 135 | 1 | 1 | 1 | 1 | 1 | 1 |
| Lead Acetate | 4 | 4 | 1 | 2 | 2 | 2 |
| Lead Nitrate | 2 | 1 | 1 | 1 | 1 | 1 |
| Lead Oxide | 1 | 1 | 1 | 1 | 1 | 1 |
| Lehigh X1169 | 1 | 1 | 4 | 1 | 1 | 2 |
| Lehigh X1170 | 1 | 1 | 4 | 1 | 1 | 2 |
| Light Grease | 1 | 1 | 4 | 1 | 1 | 4 |
| Ligroin (Petroleum Ether, Benzene) | 2 | 1 | 4 | 1 | 1 | 2 |
| Lime Bleach | 1 | 1 | 1 | 1 | 1 | 1 |
| Lindol (Hydraulic Fluid, Phosphate Ester) | 1 | 2 | 1 | 4 | 1 | 4 |
| Linoleic Acid (Linolenic Acid) | 1 | 2 | 4 | 2 | 2 | 2 |
| Linseed Oil | 1 | 1 | 3 | 1 | 1 | 3 |
| Liquid Oxygen | 4 | 4 | 4 | 4 | 4 | 4 |
| Liquified Petroleum Gas (LPG) | 2 | 1 | 4 | 1 | 1 | 2 |
| Liquimoly | 1 | 1 | 4 | 1 | 1 | 2 |
| Lithium Hydroxide | 1 | 3 | 1 | 2 | 2 | 2 |
| Lubricating Oils (Crude & Refined) | 1 | 1 | 4 | 2 | 2 | 3 |
| Lubricating Oils, Diester | 2 | 1 | 4 | 2 | 2 | 2 |