It seems that Kazakhstan goes cellular glass. We found a few topics about cellular glass in the THE STATE PROGRAM on industrial development of Kazakhstan for 2015-2019. We make some citations:

• High import growth rates for the last 3 years were observed on OSB plates,
  roofing and bitumen materials, including tiles, products of refractory materials,
  refractory bricks, ceramic tile, sheet glass, sanitary ceramics, mineral insulation
  materials, foam glass.
• Rehabilitation and reconstruction of productions of demanded retro materials
  (expanded clay, foam glass, expanded vermiculite, pumice) is needed.
• construction of a plant for producing foamed glass, LLP “KiKo Stroy Service”

It is not clear whether they wanted gravel or boards or both. But the evolution to mineral foam is very positive.