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In this research, we manufactured the paste opaque porcelains using Propylene Glycol (PG) andButhylene Glycol (BG) as a solvent, and compared the composition of solvents, the coefficient ofthermal expansion, the particle size distribution, the viscosity and bonding strength to metal, andthe tone with those of the commercial products(Duceram Plus, Duceram GmbH; VMK 95, VitaCo.; Noritake EX-3, Noritake Co.)used in the clinical field. The results of the research were as follows: 1. The result of solvent analysis indicated that the solvents included in the paste opaqueporcelains of the control group were mainly composed of Glycols.2. From the Coefficient of thermal expansion measurement, we drew out the following results;testing group: 14.010-6/, Duceram Plus: 13.910-6/, VMK 95: 14.310-6/, and NoritakeEX-3: 13.310-6/.3. Seen from the result of particle size distribution measurement, the experimental group was similar to the control group in 1㎛below, but the experimental group marked the highestdistribution of 61% in the case of between 1㎛and 5㎛. Between 5㎛and 10㎛, they showedrelatively similar distribution, and Noritake EX-3 was turned out the highest distribution of 29% in10㎛above.4. From the result of viscosity measurement, Duceram plus showed the highest viscositythroughout all the measurements followed by Noritake Ex-3, experimental group and VMK 95 indecreasing order.5. The result of bonding strength measurement was EX 35.53 ßÁ, DU 40.88 ßÁ, VM 39.43 ßÁ,and NO 35.39 ßÁ, and no significant difference was found between the experimental group and thecontrol groups(P>0.05).6. The measurement of the tone indicated that the L* value of the experimental group was 86.890.63 in average, which is higher than the control group in its brightness. In the case of the a* value,Duceram Plus, VMK 95 and EX-3 showed positive value, whereas the testing group was turned outnegative value. In b* value, Duceram Plus proved the highest. From the results of this research, the paste opaque porcelains using Propylene Glycol (PG) andButhylene Glycol (BG) as a solvent did not make differences from the commercial products thatare actually used in the clinical fields. Therefore, it is possible to utilize Propylene Glycol (PG) andButhylene Glycol (BG) for the paste opaque porcelains of P.F.M crown. It is also recommendedthat further researches concerning the compositions and forms of powder, the types of organicsolvent components and the ratio of mixture proceeded in order to improve the level of productivityin the future.