  Recently it has been shown that the $\alpha$-Sun density $h(x)$ [{\it J.
Math. Anal. Appl.}, {\bf 527} (2023), p. 127371] which interpolates between the
Fr{\'e}chet density and that of the positive, stable distributions whose
density is given by a Fox $H$-function, has a Mellin transform involving an
infinite product of ratios of Incomplete Beta functions. We develop systematic,
but asymptotic, approximations for such products and consequently for the
behaviour of the density as $ x\to 0+$ which complement the recent exact form
for this by Simon [{\it Electron. Commun. Probab.}, {\bf 28} (2023) p. 1 - 13].
The systematic expansion is an example of a Power Product Expansion, and in our
case we derive bounds and estimates which show that this expansion is not
convergent and thus only yields an asymptotic expansion.
