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Table 4 SUMMARY of modern MMVF (#1 to #28) compared to IARC reference ranges: results on composition and dissolution. The compositional range of Rock (stone) wool (cancerogen classification, low biosolubility) is represented by the historical reference MMVF21. The compositional range of high-alumina, low-silica wool (synonymously HT stone wool or high biosolubility stone wool or CAS 287922-11-6) is represented by the historical reference MMVF34

From: Composition, Respirable Fraction and Dissolution Rate of 24 Stone Wool MMVF with their Binder

  High-alumina, low-silica wool (exonerated from classif.) MMVF34 (represents high biosolubility) Rock (stone) wool, (cancerogen classification) MMVF21 (represents low biosolubility) This test set (excluding MMVF #17)
COMPOSITION [10] [19] [10] [19] Average Min Max
SiO2 33 – 43 39 43 – 50 46 42 40 44
Al2O3 18 – 24 23 6 – 15 13 19 15 24
CaO 23 – 33 15 10 – 25 17 28 16 33
MgO 10 6 – 16 9
Fe-oxides 3 – 9 7 3 – 8 6 7 1 10
Al/(Al+Si)   0.41   0.25 0.34 0.29 0.38
DISSOLUTION      Average Min Max
kSi pH 4.5 in ng/cm2/h > 400 831 (620)*   47 (72)* 41 17 171
kSi pH 7.4 in ng/cm2/h   58 (59)*   23 (20)* 20 6 35
  1. *Note: Comparison of IARC Table 65 to Guldberg et al (1998) Table 4 clarifies that IARC chose to document for MMVF21 and MMVF34 the kleach value, which reports Ca and Mg ions. The actual fibre disintegration is assessed by earlier and by the present studies via kSi. Hence we compare materials based on kSi and provide the values from the IARC table in brackets for transparency [10, 19]
  2. ‡The value of k > 400 ng/cm2/h for the exonerated CAS range is from [16]