Having shipped 400,000 of the Eee Pad Transformer in April and May this year, ASUS plans to ship 300,000 more of the Android tablet in June this year. According to ASUS chief executive Jerry Shen, the hike in shipment volume may outnumber the amount of units shipped by rival non-iPad makers.

ASUS chairperson Johnny Shih noted the slowdown of non-iPad tablet shipments among all other suppliers, yet the market sustains a strong demand for the ASUS Eee Pad Transformer, which the company recently launched.

ASUS’s shipments of the Android tablet last April and May have exceeded the company’s shipment goal, which was pegged only at 300,000 units for both months. The target shipment volume for June practically is double that of ASUS’s target for either April or May.

Shen expects that ASUS’s tablet offerings will rake in about US$87 million to US$103 million, representing about a tenth of ASUS’s total revenue for June alone.

The ASUS Eee Pad Transformer is a 10.1-inch tablet running the Android OS intended for tablets: Honeycomb. Other tablet makers have also been pushing their own tablets into the market. The Eee Pad Transformer’s strongest rival is the Acer Iconia Tab, said to be nearly identical to the Transformer. Other competing tablets include HTC’s Flyer, Research in Motion’s PlayBook, T-Mobile’s G-Slate, and Samsung’s Galaxy Tab.

Hewlett-Packard is yet to release its TouchPad tablet early next month, as will Toshiba with the THRiVE–its first attempt at the tablets game. Dell, however, is exercising a little skeptical restraint by choosing to launch its Android tablet in China first, rather than in the U.S., because the company has yet to study further what exactly the Android platform is bringing to the table and the platform’s being relatively young.

ASUS, on the other hand, has vowed to debut a slimmer, upgraded, second-generation version of the Eee Pad Transformer some time in the fourth quarter.