FIELD: technologies for testing properties of materials.
SUBSTANCE: in method for determining compositions of friable bi-senary systems of expanded type with core dimensions in fractions 
determined by method of sieve analysis or sedimentation method, fraction volumes are determined for binary systems: V1=1/α 1, m3, V2=V1(α 1-1), m3, α 1=(1+d2/d1)3, m3, for ternary systems V1=1/α 1, m3, V2=V1((α 1-1)/ α 2), m3, V3=V2(α 2-1), m3, α 1=(1+(d2+2· d3)/d1)3, m3, α 2=(1+d3/d2)3, m3, for quaternary systems V1=1/α 1, m3, V2=V1((α 1-1)/ α 2), m3, V3=V2((α 2-1)/ α 3), m3, V4=V3(α 3-1), m3,
α 1=(1+(d2+2· d3+4· d4)/d1)3, m3, α 2=(1+(d3+2· d4)/d2)3, m3, α 3=(1+d4/d3)3, m3, for quinary systems V1=1/α 1, m3, V2=V1((α 1-1)/ α 2), m3, V3=V2((α 2-1)/ α 3), m3, V4=V3((α 3-1)/ α 4), m3, V5=V4(α 4-1), m3, α 1=(1+(d2+2· d3+4· d4+8· d5)/d1)3, m3, α 2=(1+(d3+2· d4+4· d5)/d2)3, m3, α 3=(1+(d4+2· d5)/d3)3, m3, α 4=(1+d5/d4)3, m3,for senary systems V1=1/α 1, m3, V2=V1((α 1-1)/ α 2), m3, V3=V2((α 2-1)/ α 3), m3, V4=V3((α 3-1)/ α 4) ,m3, V5=V4((α 4-1)/α 5), m3, V6=V5(α 5-1), m3, α 1=(1+(d2+2· d3+4· d4+8· d5+16· d6)/d1)3, m3,
α 2=(1+(d3+2· d4+4· d5+8· d6)/d2)3, m3, α 2=(1+(d4+2· d5+4· d6)/d3)3, m3, α 3=(1+(d5+2· d6)/d4)3 ,m3, α 4=(1+d6/d5)3, m3, where V1,V2,V3,…,V6 - fractions volumes with core sizes d1,d2,d3,…,d6,m3; α 1, α 2, α 3, ... , α 5 - volumetric coefficients of separation of cores with d1 dimension by all other cores, dimension d2 by all other cores, etc.
EFFECT: higher efficiency.
20 ex
