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-- outside the update function, in file scope
local decompositionTemperature = {
	[ metal_1 ] = temp_1,
	[ metal_2 ] = temp_2,
	...
}

...

function()
	...
	-- inside the update function
	local dt = decompositionTemperature[sim.partProperty(i, "ctype")]
	if dt and sim.partProperty(i, "temp") < dt then
		-- decompose
	end

	...
end

...