The third year project of the spherical reference materials is to manufacture opaque particles having unimodal distribution in the size and also to produce transparent particles in the size range of 1 to 1Opm (MBPl-10) according to the range of 10 to IOOpm (GCPlO-100), BCR’s request.
1) The opaque particles are glassy carbon beads denoted by GCPlO-100, and more than 95% in weight of these particles are in the size range of 10 to 100 pm. The product materials, GCPlO-100, of 20kg were sent to the AEA Technology, England for the certification in June, 1993. 2) The transparent particles are barium titanate glass beads denoted by MBPI-10, and more than 95% in weight of these particles are in the size range of 1 to 1 Opm. The product materials, MBPl-10, of 1 Okg were also sent to the AEA Technology, England in April, 1993.
The physical characteristics of the above product materials, especially the size distributions, were measured in several Japanese company- laboratories, and are given in this report.
We also studied the size segregation of larger particles, 150 to 650pm, by feeding them into a container, resulting in a significant segregation. Therefore, complete mixing and/or careful splitting is necessary before utilizing them as the reference materials.
The next year project will be to manufacture following two kinds of spherical materials.
1) LBPl50-650: Transparent soda-lime-silicate glass beads having the size range of 150 to 650p.m. The quantity is 20kg. 2) GCPl50-650: Opaque glassy carbon beads having the size range of 150 to 650pm. The quantity is 20kg.