Abstract: A new-type of water soluble material,which trade mark is Aquacore^TM,has been investigated. The properties investigated include density,linear expansion ratio,compressive strength and compressive creep ratio. The results show that the density is about 0. 47g /cm³,mean linear thermal expansion coefficient is 1. 17 × 10 ^–6 /℃,compressive strength is 2. 40MPa under 190℃,compressive creep ratio is less than 1. 5%. In the meantime, application research has been conducted. With water soluble mold,a CFRP double-peak corrugated part has been fabricated. The influences of roughness and de-mould method on product have been studied. The test results show that finished surface roughness of water soluble mold R_a is 1. 2,the roughness of product's marble surface R_a is 3. 4. Temperature ＆ water used during de-molding have little effect on product. The moisture absorption of product is 0. 98%. It is shown that the water soluble mold is especially suitable for complex structural parts and those parts which are hard to de-mold.

Key words: water soluble mold, density, linear thermal expansion coefficient, compressive strength, compressive creep ratio, surface roughness, moisture absorption, de-mold