Underbody protection – optimum stone chip protection with Desmodur®-systems

When it comes to underbody protection coatings have to meet extreme requirements regarding impact strength and abrasion resistance. Desmodur® and Desmophen® based one component an two component polyurethane systems provide outstanding corrosion protection even in case of heavy stone-chipping. These coatings for underbody protection are generally applied on the cathaphoretic dip layer, which must create coating layers between 100µm and 2mm (at joints).

In addition, two component -under body coating systems cure at ambient temperature (energy efficiency) and show a lower weight compared to other systems, and polyurethane technology is suitable for the production of plasticizer-free coatings as well.

A selection of raw materials for polyurethane coatings in underbody protection

	Type	Solids in %	% NCO or OH on solids	Viscosity mPas at 23°C	Characteristics
Desmodur® BL 1100/1	TDI polyisocyanate	100	3.0 blockedNCO, (on supply form)	43000	For the production of highly elastic, stoving one component coatings, creates rubber-like elastic films with good mechanical properties
Desmodur® VL 50	MDI polyisocyanate	100	32.5 NCO	23 (25°C)	Suitable for the production of self-leveling, highly elastic systems
Desmodur® VP LS 2086	Aromatic prepolymer	100	19.0 NCO	850	As reaction partner for solvent-free underbody protection and sound deadening coating systems and joint sealings
Desmophen® 1145	Polyester- Polyether polyol	100	7.1 OH	2950	Tough but elastic, abrasion resistant coatings, good chemical resistance
Desmophen® 1150	Polyester- Polyether polyol	100	4.7 OH	3500	For two component concrete flooring, asphalt flooring and steel surfaces, tough, elastic and abrasion resistant coatings, good chemical resistance
Desmophen® 5035 BT	Polyether polyol	100	1.1 OH	860 (25 °C)	For the production of elastic coatings and suitable raw material for the production of reactive adhesives

Some starting formulations

RR 4103	One-component polyurethane stoving underbody protection system
	(Desmodur® BL1100)
.
RR 4107	Two-component polyurethane solventfree underbody protection (Desmophen® 1150 / Desmophen® 5035 BT / Desmodur® VP LS 2086)