ELASTOSIL^® E60 N GREY

Baking Tray Coatings

ELASTOSIL^® E60 N GREY is designed to create long-lasting, non-stick coatings for an optimum release of bakery products. Baking trays coated with silicone rubber are particularly suitable for croissants, buns, white bread, brown bread and sourdough bread.

Surface Preparation:

Though ELASTOSIL^® E60 N GREY shows primerless adhesion to many substrates, the trays to be coated should be cleaned prior use in order to remove any dirt, rust, oil or grease. If required, the surface of the trays can be roughened by sandblasting to improve the adhesion of the silicone rubber coating.

Priming:

For an optimum of adhesion it is recommended to additionally prime the trays with WACKER^® Primer G 790 TOLUENE FREE. Both primers are best applied by spraying; dipping or brushing is also suitable.

Please note: as a too thick primer layer can reduce adhesion, WACKER^® Primer G 790 TOLUENE FREE should be applied as a very thin coating only (< 2 µm thickness). In order to minimize the layer thickness, it is recommend to dilute the primers directly before use with a nonpolar and technically dry solvent (cyclohexane, white spirit or a similar aliphatic solvent) in a 1:1 or 1:2 ratio (primer:solvent). Please mind the food compliance of the solvent used for diluting ! For further details regarding priming with WACKER^® Primer G 790 TOLUENE FREE, please revert to the respective technical data sheet.

When the primer solution has been applied, the primed parts must be air dried for at least 15 minutes to allow all solvents to evaporate. Finally, the primer layer is baked at 150 to 170 °C for 20 minutes.

Preparation of the coating suspension:

Though ELASTOSIL^® E60 N GREY is flowable and self-levelling, the product needs to be diluted before use in order to get optimum coating results. Suitable diluents are non-polar, aliphatic solvents such as technically dry cyclohexane, white spirit or a similar aliphatic grade (please mind the food compliance of the solvent used !). A mixing ratio of 1:1 to 2:1 (solvent:silicone rubber) is recommended.

Important: once prepared, the coating mixture has to be stirred continously in order to prevent the separation of fillers. Furthermore the container should be humidity-tight and must be kept properly closed, because the coating suspension is sensitive to moisture.

Coating:

The coating mixture can be applied by any coating method, such as spraying, dipping and brushing. However, airless spraying equipment is particularly recommended, as this avoids premature curing of the silicone rubber suspension during spraying.

Since the film thickness is essential for the durability of the anti-stick coating, the silicone rubber suspension should be applied in a quantity of some 150 g per m² (including overspray). Multilayered application is possible, e.g. for baking pans with a a complex design. In total, the rubber coating should have a thickness of 150 µm (minimum) to 350 µm (maximum) after curing.

Curing:

The curing process already starts during application, in the moment when the coating suspension gets in contact with air moisture. For physical drying it is recommended to store the coated trays for at least 60 minutes at room temperature in order to allow the solvents to evaporate. Subsequently the coating is baked at 250 °C for 1 hour (alternatively: 4 hours at 200 °C).

Coating removal (deglazing, restoration):

Coated baking trays and pans can be restored either by pyrolysis at a temperature above 600 °C, followed by cleaning via sandblasting, or by chemical methods (immersion into a highly basic etching bath, followed by thoroughly rewashing the trays with water). Alternatively, the silicone rubber coating can be removed by CO₂ blasting or sandblasting.