P – 311

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  • Economical
  • Good foam adhesion
  • Excellent flexibility
  • Good light fastness
  • Good exterior durability
  • Excellent stain resistance


P-311 is linear oil free polyester developed for use in Coil Coating, sheet fed Metal Decorating and General Industrial applications.

P-311 is compatible with a wide range of melamine resins and is typically hexamethoxymethyl melamine and partially methylated melamine.

For an optimum performance with respect to level of cure, flexibility, hardness and impact resistance, a combination of P-311 with hexamethoxymethyl melamine resin at ratio of 70:30 to 85:15 on solid resin content is suggested.

To promote cure, the use of between1% to 5% of acid catalyst is recommended, e.g. paratoluene sulphonic acid, calculated on melamine solids.

Variation in the levels of P-311 and the type of amino resin will modify the overall performance of the coating. Increasing the level of amino resin (and catalyst) will generally tend to increase the hardness and solvent resistance of the coating but may compromise flexibility.

For Coil Coating:

Applications an 85:15 to 80:20 ratio, on solids, with hexamethoxymethyl melamine resin is recommended with 2% PTSA catalyst on amino level.

For Metal Decorating:

On solids, of 72:18:10 OFPE: melamine: epoxy resin (epoxy equ. »500) with 2% PTSA solids amino is suitable.

Part methylated amino resin can be used in place of hexamethoxymethyl melamine and will develop very good hardness & solvent resistance but at the expense of flexibility.

General industrial enamels:

Can be formulated with 70:30 to 80:20 ratios with hexamethoxymethyl melamine or part methylated melamine, with 2% PTSA catalyst. Enamels based on P-311 exhibit good light fastness results after prolonged UV exposure and finishes are resistant to staining from a variety of household materials.


Viscosity as such in Brook Field RVT SSA/S – 28, RPM – 60 at 25°C Temperature 40 – 50 Poise
Color on Gardner Scale 2 Max
Acid Value (mg KOH/gm) 2 - 10 Max
Hydroxyl Value 150 ± 5
Solvent Aromatic Solvent : Butyl Glycol 70 : 30


n-Butyl Acetate Complete Soluble
Xylene Not Soluble
MTO /LAWS Not Soluble


P-311 70 ± 2% Aromatic Solvent : Butyl Glycol 70 : 30

Suggested Curing Schedules

Coil Coating 232°C - 240°C Temperature As per Requirement
Metal Decorating 160°C - 200°C Temperature 10 Minutes
General Industrial 150°C Temperature 30 Minutes
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