PHENODUR® PR 285/55IB/B

In its reactivity Phenodur PR 285 resembles the Phenodur grades PR 217, PR 401 and PR 723; it cures more rapidly than Phenodur PR 612 and Phenodur PR 897. Lacquers based on Phenodur PR 285 display the deepest gold shades of all Phenodur grades.

The relatively low-viscosity resin Phenodur PR 285 gives coatings with a particularly high solids content. The Phenodur grades suitable for combination with epoxide resins are PR 217, PR 285, PR 401, PR 722, PR 723 and PR 897.

Can coating

After stoving, combinations of 20 - 40 % Phenodur PR 285 and 80 - 60 % Beckopox EP 307 or EP 309 (each calculated on the solids content) yield high-adhesion, chemically resistant films with good flexibility for the internal and external coating of cans, tubes and other packaging containers used in the food and luxury commodity industries.

Chemically resistant protective coatings

Phenodur PR 285 can be used as sole binder in high resistant stoving enamels. The stoved films are comparatively brittle and can only be used on rigid substrates. Polyvinyl butyrals can be employed as plasticizing agents. The main products suitable for combination with epoxide resins is Phenodur PR 285. Since plastification reduces the general resistance of the stoving enamel coatings against chemicals, the mixing ratios have to be adjusted according to the resistance and film qualities required. Epoxide resin combinations with a predominant phenolic resin constituent have proved successful for coatings exposed to acid agents. Good film flexibility and resistance to alkalis are achieved by using rather large amounts of epoixide resin. Systems being employed for protective coatings of this type can be pigmented with inert fillers and pigments. In multi layer coatings, the first coats applied are not fully cured, but dried at relatively low temperatures only. The coating system as a whole is cured together with the last coat applied (e. g. 30 min/180 - 210 °C). Coatings based on this principle are used for chemical resistant interior linings of vessels, apparatus and pipelines in the chemical and allied industries.

Preparing the resin solution and diluents

The phenolic resin solutions are mixed with the other resin solutions at room temperature. Glycol ethers, esters, diacetonealcohol and higher ketones are suitable as solvents. Aromatic hydrocarbons can be used as thinners.

Stoving conditions

Depending on the application and film thickness, stoving condition lie between the limits of 30 to 10 minutes at 180 to 210 °C. Higher temperatures may cause a loss of flexibility. For relatively thin films, as applied for can coating, 10 to 15 min/190 - 200 °C is sufficient.

The importation, processing or use of this product in the United States of America is subject to a Significant New Use Rule (SNUR) issued by the U.S. Environmental Protection Agency (US EPA).

Among other conditions, the SNUR prohibits the predictable or purposeful release of the product to waters of the U.S. from manufacturing, processing or uses and imposes certain notice and recordkeeping requirements. Please see 40 CFR 721.5905 [or 40 CFR 721.5908 as applicable] for further information. This product may also be subject to export notification under TSCA Sec. 12(b).

At temperatures up to 25 °C storage stability packed in original containers amounts to at least 365 days.