Steam explosion pulps were studied by means of CP/MAS <sup>13</sup>C NMR spectroscopy. The steam explosion treatment of aspen chips with Na<sub>2</sub>SO<sub>3</sub> and Na<sub>2</sub>SO<sub>3</sub> + NaOH led to a loss in hemicellulose and an increase in cellulose crystallinity. No lignin dissolution occurred during explosion pulping, although the lignin structure might have changed to a certain extent. For comparison purposes, conventional CMP and CTMP pulps were also analyzed. The conventional treatments revealed less modification in the spectrum with regard to original wood samples.

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