Sewatek Fire Collars Fire collars are fire stopping steel collars with intumescent band inside. -Sewatek Special Fire Collars Special fire collars are fire stopping steel collars with intumescent band inside. The products are used when changing materials of pipes from metal to plastic. - Sewatek Multi Penetrations Multi penetrations are fire penetration seals with plastic cover, intumescent band inside the cover and seals. - Sewatek Fire Wrap Wraps are fire stopping products with intumescent band packed in plastic cover.