Smooth-Cast™ 57 D / 7,53 kg

Smooth-Cast® 57D ist ein halbstarrer Urethan-Kunststoff, der ein allmähliches Aushärtungsprofil bietet (keine Schnapphärtung), wodurch er sich für den Maschinen- oder Handrotationsguss eignet.

Verwendung für Rotationsguss - Nach dem Gießen in eine geeignete Gummiform kann die Form gedreht werden, so dass die Harzmischung allmählich die Innenseite des Formhohlraums bedeckt. Nachdem eine ausreichende Wandstärke in der Form erreicht ist, entsteht ein ausgehärtetes, hohles Gussteil, das halbsteif und sehr stoßfest ist.

Verwendung als Gießharz - Smooth-Cast® 57D kann auch als Gießharz zur Herstellung fester, halbstarrer Gussteile verwendet werden, die zäh und dauerhaft sind.

Das Mischungsverhältnis ist 1A:1B nach Volumen. Die Verarbeitungszeit beträgt 3 Minuten, die Entformungszeit 30 Minuten und die volle Aushärtung wird nach 24 Stunden erreicht. Die Farbe ist weiß-transluzent und das Material lässt sich sehr leicht mit SO-Strong®, UVO® oder Ignite® Farbstoffen einfärben. Ausgehärtetes Harz lässt sich auch leicht mit Acrylfarben oder UreCoat®, einer flexiblen Beschichtung für Anwendungen, die dicke, dauerhafte Oberflächen erfordern, streichen.

HINWEIS: Smooth-Cast™ 57D und Smooth-Cast™ 65D ebenfalls sind für Rotationsgussanwendungen geeignet. Verwenden Sie keine anderen halbstarren Smooth-Cast™ Kunststoffe für Rotationsguss

Materials should be stored and used in a warm environment (23°C). This material has a limited shelf life and should be used as soon as possible. Mixing should be done in a well-ventilated area. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. All liquid urethanes are moisture sensitive and will absorb atmospheric moisture. Mixing tools and containers should be clean and made of metal, glass or plastic. Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.

Applying A Release Agent

A release agent is necessary to facilitate demolding when casting into or over many surfaces. Use a release agent made specifically for mold making and casting such as Mann’s Ease Release™ 200 available from Smooth-On. A liberal coat of release agent should be applied onto all surfaces that will contact the plastic.

IMPORTANT: To ensure thorough coverage, apply release and brush with a soft brush over all surfaces. Follow with a light mist coating and let the release agent dry for 30 minutes.

Smooth-On silicone rubber molds usually do not require a release agent unless casting silicone into the mold. Applying a release agent will prolong the life of the mold.

Mixing
Pre-Mix PART-A and PART-B Thoroughly Before You Begin. After pre-mixing both parts, dispense required amounts of Parts A and B into mixing container and mix thoroughly. Stir for at least 30 seconds, making sure that you scrape the sides and bottom of the mixing container several times.

Curing
Important: Use this product with at least room size ventilation or in proximity to a forced outlet air vent and do not inhale/breath fumes. Fumes, which may be visible with a significant mass concentration, will quickly dissipate with adequate ventilation. Castings with significant mass may be hot to the touch and irritate skin immediately following cure. Let casting cool to room temperature before handling.

Demold time of the finished casting depends on mass and mold configuration. Low mass or thin-walled castings will take longer to cure than castings with higher mass concentration.

If making rotational or hollow castings, backfilling with a rigid foam (Foam-iT! 5 or other) will provide lightweight reinforcement. Foam backfilling is recommended if castings will be subjected to temperatures above 85°F / 30°C.

Performance

Cured castings are semi-rigid and impact resistant. They resist moisture, mild heat, solvents (intermittent contact) and can be primed/painted or bonded to other surfaces (any release agent must be removed) using Urebond or similar flexible adhesive. If machining material, wear breathing protection. Unpainted castings may discolor in proportion to duration and intensity of exposure to UV light.

If suitability of any Smooth-On material is in question for your application, a small scale test is recommended before using for an important project.