latched plug allows pressure to force the sleeve open in a piston effect in other respects the procedure is similar fig9 and 10 illustrate an embodiment for the disappearing material plug 44 or 80 illustrated in use in fig1 8 since the material needs some structural strength to withstand differential pressure during pumping procedures like a frac job the design features alternating layers of a biopolymer 86 alternating with water soluble metal discs 88 in the assembly the discs 88 are all internal the biopolymer 86 has a relatively slow dissolving rate coupled with poor creep resistance the discs 88 are fast dissolving but add strength and creep resistance a retaining sleeve 90 engages thread 92 on housing 94 to compress the assembly within passage 96 for run in longitudinal compression creates a better peripheral seal in housing 94 fig1 represents another construction for such a plug as an alternative to the one illustrated in fig9 and 10 here the end components 98 and 100 are preferably a biopolymer with a relatively slow dissolving rate and poor creep resistance sandwiched in between is a granular substance such as for example sand frac proppant or glass micro spheres 102 when a directional load is placed on either end component 98 or 100 the applied stress is transferred to the layer 102 and due to shifting of the granular material the load is shifted outward against ring 104 that is secured to the housing 106 at thread 108 before it can migrate to the opposite end component this helps to retain the sealing integrity of the assembly as before in fig9 and 10 the ring 104 is used to initially longitudinally squeeze the assembly for better sealing after exposure to well.