<Tr> <Td> Ethylene </Td> <Td> 2.7 </Td> <Td> 36 </Td> <Td> IA </Td> <Td> </Td> <Td> 0.07 </Td> <Td> 490 ° C </Td> </Tr> <Tr> <Td> Ethylene glycol </Td> <Td> </Td> <Td> 22 </Td> <Td> </Td> <Td> 111 ° C </Td> <Td> </Td> </Tr> <Tr> <Td> Ethylene oxide </Td> <Td> </Td> <Td> 100 </Td> <Td> IA </Td> <Td> − 20 ° C </Td> <Td> </Td> </Tr> <Tr> <Td> Ethyl chloride </Td> <Td> 3.8 </Td> <Td> 15.4 </Td> <Td> IA </Td> <Td> − 50 ° C </Td> <Td> </Td> </Tr>

What is the maximum allowable lower explosive level (lel)