Unexpanded perlite ore polishing composition and methods

An acrylic denture polishing composition comprising:

• a base material including grains of unexpanded perlite ore having a selected distribution of particle sizes which has a (d90) particle size of about 101 μm to about 229 μm, said selected distribution at 50% by volume of grains of unexpanded perlite having a particle size in the range of about 48 μm to about 146 μm, said base material being responsive to a abrasive force being applied to the base material during polishing resulting in continued fracturing of the grains of unexpanded perlite to yield a final polishing composition with a distribution of particle sizes having a greater number of grains of perlite having a smaller particle size than the number of grains of perlite having a smaller particle size in said selected distribution and wherein said final polishing composition has a sufficiently low level of abrasiveness making suitable for use in polishing.

An acrylic denture polishing composition comprising:

• a base material including grains of unexpanded perlite ore having a selected distribution of particle sizes which has a (d90) particle size in a range of about 101 μm to about 229 μm, said selected distribution at 10% by volume of grains of unexpanded perlite having a particle size in the range of about 20 μm to about 92 μm, said base material being responsive to a abrasive force being applied to the base material during polishing resulting in continued fracturing of the grains of unexpanded perlite to yield a final polishing composition with a distribution of particle sizes having a greater number of grains of perlite having a smaller particle size than the number of grains of perlite having a smaller particle size in said selected distribution and wherein said final polishing composition has a sufficiently low level of abrasiveness making suitable for use in polishing.

A method for polishing a surface of an article comprising

• applying to a surface of an article to be polished a quantity of a unexpanded perlite ore polishing composition comprising a base material having grains of unexpanded perlite ore of a selected distribution of particle sizes which undergo fracturing of the grains as a function of an abrasive force applied to the base material, said selected distribution of particle sizes including a significant volume of grains of unexpanded perlite ore having a (d90) particle size in a range of about 101 μm to about 244 μm, said base material being responsive to an abrasive force being applied thereto during polishing of the article resulting in continued fracturing of the grains of unexpanded perlite ore to yield a final polishing composition having a sufficiently low level of abrasiveness under said abrasive force making it suitable for use in polishing which results in continued fracturing of the grains as a function of an abrasive force applied to the base composition;
• and
• applying an abrasive force to said base composition fracturing the grains of unexpanded perlite ore to yield a final polishing composition having degraded grains of unexpanded perlite ore having particle sizes of less than the initial particle sizes and a sufficiently low level of abrasiveness making it suitable for use in polishing the surface of an article.

A cathode ray tube surface polishing composition comprising

• a base material having grains of unexpanded perlite ore of a selected distribution of particle sizes which undergo fracturing of the grains as a function of an abrasive force applied to the base material, said selected distribution of particle sizes including a significant volume of grains of unexpanded perlite ore having a (d90) particle size in a range of about 159 μm to about 244 μm, said base material being responsive to an abrasive force being applied thereto during polishing of cathrode ray tub surface resulting in continued fracturing of the grains of unexpanded perlite ore to yield a final polishing composition having a sufficiently low level of abrasiveness under said abrasive force making it suitable for use in polishing.

A polishing composition comprising

• a base material having grains of unexpanded perlite ore of a selected distribution of particle sizes which undergo fracturing of the grains as a function of an abrasive force applied to the base material, said selected distribution of particle sizes including a significant volume of grains of unexpanded perlite ore a (d90) particle size in the range of about 101 μm and about 248 μm, said base material being responsive to an abrasive force being applied thereto during polishing resulting in continued fracturing of the grains of unexpanded perlite ore to yield a final polishing composition having a sufficiently low level of abrasiveness under said abrasive force making it suitable for use in polishing to avoid formation of scratches on the final polished surface.