Properties  of the different types of  foam

Foam Expansion	low					medium		high
Foaming  Agent	Protein			Synthetic		Synthetic		Synthetic
Caracteristic	Protein	Fluor- Protein	FFFP	Deter- gent	AFFF AFFF/AR	Deter- gent	AFFF AFFF/AR	Deter- gent
Alcohol  resistance	o1)	o1)	++1)	-	++1)	-	++1)	-
Film formation	-	o	++	-	++	-	++	-
Flowability	o	++	++	+	++	o	++	-
Gas-tightness	+	++	++	+	++	o	++	-
Adhesiveness	++	+	-	o	-	o	-	-
Isolation effect	++	++	o	+	o	+	o	++
Insulating effect	+	+	++	++	++	o	++	-
Cooling effect	+	+	++	++	++	o	+	-
Extinguishing time	o	+	++	+	++	+	++	o
Wetting effect	-	o	++	+	++	o	++	-
Foam wight	++	++	++	++	++	o	o	-
Foam high	o	o	-	o	-	++	o	++
Foam stability	++	+	o	++	o	o	-	o
Drainage time	++	+	-	+	-	o	-	-
Projection range	+	+	++2)	+	++2)	o	o	-

++ very good / very high 1) only alcohol resistant protein foaming agent + good  /  high 2) AFFF and FFFP used on petroleum products can be applied in non-aspirated form to achieve a wider projection range, e.g. when fighting storage tank  fires. o suitable / average   - unsuitable  /  low