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Liquid metal foam owes its stability to the presence of solid non-metallic particles. To elucidate the conditions under which such particles stabilise foams, 15 different aluminium-alloy based metal matrix composites were manufactured and melted, after which air was injected with the objective to create bubbles and eventually metal foam. Bubble and foam formation was monitored in-situ by Xray radioscopy. All systems were classified and labelled foamable, partially foamable and unfoamable. Foamable composites form a preferred range in the stability diagram displaying particle fractions vs. particle size, thus experimentally confirming earlier claims. All investigated composites fall into the same range even though their alloy compositions and particle types vary.