Lori J. Ryerkerk
Chairman of the Board and Chief Executive Officer at Celanese
Yeah. Look I would say in Q1, we did see moderation. I mean from peak to trough, the peak in Q4 to the trough in Q1, we saw about a $600 per ton reduction in acid price in China. Even average to average was about $300. So I think we are seeing moderation in China acid. What I would say is that has been pretty much an Eastern phenomena. So we've been able to take volumes and pivot to the West, where we saw margins maintained in the Western Hemisphere. And we've been able to pivot to the downstream and with strong demand for VAM continuing.
But also we noticed especially emulsions products, redispersible powders, EVA. I mean, I think we called it out in the comments but for the first time ever 25% of our earnings in acetic acid were really -- were due to just RDP and emulsions products. So that's pretty amazing if you think about it. So I mean that's the power of our model.
As we look at it, I mean, another way to think about this I mean we refer a lot to 2018 is in 2018, 78% of our earnings in the Acetyl Chain came from acetic acid. In this quarter, 50% of our earnings came from acetic acid. So I think what we've called out, which is a moderating acetic acid is absolutely true. The numbers support it for the first quarter.
We expect that to further moderate as we move into the second quarter. And in time we -- Western Hemisphere prices will start to trend down and margins trending down as well. Ethylene price is going to continue to increase in second quarter, so that's going to cause a little bit of further margin compression. And that will continue we believe as we go through the year.
Now we've said that for a while. Fortunately the moderation has started later and gone slower than we anticipated in our original outlook, which is why we've been able to raise our outlook on Acetyl Chain. I would also say we talk a lot about foundational earnings. And I think previously we had called out getting to a foundational level of earnings in the second half of this year. I think we typically call foundational earnings. We have been saying $1 billion or slightly above. But I think as we're seeing the industry fundamentals change, the supply-demand continue to be tight even with the addition of a little bit of extra capacity in China, we've really seen the strength of our models, continue to develop especially our ability to generate good margins and income out of our downstream derivatives.
The stronger Western demand we've seen, our very bullish outlook by our customers. Plus we have investments coming on Clear Lake early next year other VAM VAE expansions towards the end of next year all that additional optionality we're getting, clearly we think those foundational earnings -- our level of earnings are growing something well above that $1 billion. And so altogether, I'd say while we are starting to moderate and returning to a more foundational level of earnings that foundational level of earnings has increased measurably versus where we used to be.