On tuff r insulation one facer is a continuous sheet of aluminum foil.
Celotex tuff r insulation board.
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Celotex thermax as illustrated by your first photo above was and is currently as a dow thermax product a foil faced insulating board comprised chiefly of foam insulation laminated with aluminum foil or possibly kraft paper.
Celotex tuff r ga4000 is a multi purpose rigid polyisocyanurate foam pir thermal insulation board with reflective foil facings that are uniquely reinforced with glass fibre and feature a strong reaction to fire performance when measured in accordance with new european standards.
Tuff r helps reduce air infiltration through the wall by covering cracks between the framing members and sealing tightly against the studs.
It installs easily over osb or non insulated sheathing and directly over wood studs.