Sample Calculations for Polyurethane Formulations:

If the formulation uses 95.26g of solid acrylic resin based on the following polyol and polyisocyanate:

56,100 / 460 = Hydroxyl Number = 122%NCO = 42 X 100 / NCO Equivalent Weight%NCO = 42 X 100 / 183 = 23%

Weight of polyisocyanate required = (NCO EW / OH EW) X Wt solid Resin

Short cut method for calculating the amount of isocyanate:

To adjust NCO / OH to 1.05 / 1.037.90g NCO X 1.05 = 39.79g

(183 / 460) X 95.26g = 37.90g

Chemical Resistance Rating

PARALOID AE-1285

PARALOID AU-830

PARALOID AU-750

PARALOID AU-685HS

PARALOID AU-1166

PARALOID AU-946

PARALOID AU-1453

PARALOID AU-608S

PARALOID AU-1033

0 2 4 6 8 10

PARALOID AE-1285

PARALOID AU-830

PARALOID AU-750

PARALOID AU-685HS

PARALOID AU-1166

PARALOID AU-946

PARALOID AU-1453

PARALOID AU-608S

PARALOID AU-1033

0 2 4 6 8 10

Gloss and Color Ratings

(8-10 rating) = 80-95% gloss retention

(4-7 rating) = 40-80% gloss retention

(1-3 rating) = 20-40% gloss retention

Gloss and Color Retention Avg of QUV-A & QUV-B & 2 years

Florida Exposure

Solvent Acid

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10 = No damage 8-9 = Trace swelling

4-7= Slight swelling 1-3 = Permanent damage

NOTE: The application and features are based on our starting point formulations. These formulations are relative and should not be considered absolute since performance is formulation dependent.

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Equivalents:

% Hydroxyl X 32.5 =

56,100 / (Hydroxyl Number) =

56,100 / Hydroxyl Equivalent Weight =

Polyol Equivalent Weight =

NCO Equivalent Weight =

(Hydroxyl Number X 7.5) / %NCO =

(%NCO / Hydroxyl Number) X 1333 =

Hydroxyl Number

Hydroxyl Equivalent Weight

Hydroxyl Number

17 X 100 / (%Hydroxyl)

42 X 100 / (%NCO)

Wt of NCO to cure 100g of polyol

Parts of polyol to satisfy 100g of NCO

Since we have 95.26 grams of solid resin then:

(122 X 7.5) / 23 = 39.78g of NCO to cure 100g of polyol

(39.78g / 100g) X 95.26 = 37.90g Weight of NCO required.

Acrylic Polyol: 70% Solids & OH EW = 460Polyisocyanate: 100% Solids & NCO EW = 183