undersulfated cement (химия, строительство, полимеры)

[Mara Mermaid]

Пожалуйста, помогите перевести.

Слово встречается в следующем контексте: In undersulfated cements, however, PC intercalates can be formed, either directly during the stacking process of the [Ca2Al(OH)6]+ main layer, with PC acting as the template which determines the interlayer distance, or by anion exchange between initially formed aluminate hydrates (e.g. C4AH13 or C2AH8) and the PC anion.

Заранее спасибо

[Alexander Orlov]

недонасыщенные серой