For this week's group assignment, we had to review the safety data sheets for each of your casting and molding materials, then compare test casts with each of them. To fulfill this week's assignment, we tested the materials we had in our home and TalentS lab inventory.

 

Molding Kit

We used Easy Mold putty to make the mold. We can use it for baking, chocolates, ice cubes, soap, plaster, air dry clay, concrete and low melt metals! Easy Mold is an easy to use, Odor Free, Non-Toxic, FDA compliant – Food Grade, two component silicone putty.

As we read about this type of mold it has many features some of them are:

•  Easy to use, 3 Minute working time, 25-minute cure.

• Ideal for small molds, excellent detail from original.

• Strong, flexible, reusable molds.

• High Heat range, up to 400º F.

• No Shrinkage.

• Self-releasing, no mold release agent required for most applications.

 

It’s important to work faster at kneading A & B components together, then immediately press your original into the Silicone Putty or apply to your piece; because you have about 3 minutes of working time.

 

For this mold we had two parts A and B, we had read both data sheet, and below is summary:

Composition/information on ingredients

• Silica non-respirable embedded in Silicone Rubber Matrix.

• No hazards resulting from the material as supplied.

• This product has been assessed and found not hazardous. Although there are differences - if not hazardous under CPSC, it is also not hazardous under OSHA.

 

Personal precautions, protective equipment

• Ensure adequate ventilation. Avoid inhalation of vapors/dust and contact with skin and eyes. Wear protective clothing.

•  Never return spills to original containers for re-use.

• The product is immiscible with water and will sediment in.

• Avoid release to the environment.

• Avoid incompatible materials and intense heat.

 

Incompatible materials

Strong oxidizing agents. Chlorine. Avoid using items that contain sulfur such as masking tape, clays, and latex gloves or soap which contains stearates.

 

Information on toxicological effects

• May cause discomfort if swallowed.

• Not expected to be a primary skin irritant.

• This product may cause slight irritation to the eyes.

For more information :

• Link#1

• Link#2

• Link#3

 

Casting Kit

We used smooth-on cast 300 and 65D. Both are liquid plastic and both are a kit from tow parts A and B.

The Smooth-Cast® 300 Series of liquid plastics are ultra-low viscosity casting resins that yield castings that are bright white and virtually bubble free. Vacuum degassing is not necessary. They offer the convenience of a 1A:1B by volume or 100A:90B by weight mix ratio. The differences between them are pot life and demold time.

These resins readily accept fillers and can be colored. Fully cured castings are tough, durable, machinable and paintable. They resist moisture and mild solvents. Applications for Smooth-Cast® 300 Series Liquid Plastics include reproducing small to medium size sculptures, making prototype models, special effect props and decorative jewelry.

The Smooth-Cast™ Semi-Rigid line of low-cost semi-rigid urethane casting resins cure quickly to semi-rigid plastics that offer excellent impact resistance. These plastics are easy-to-use (mix ratio is 1A:1B by volume) and have low viscosities for minimal bubble entrapment. Vibrant colors are possible.

These semi-rigid plastics are good for making impact resistant prototypes, models, toys, props, climbing holds, etc.

As we read about those type of cast it have many features some of them are:

• Perfect for pouring into rubber molds.

• Turns from a liquid to a solid plastic and reflects perfect detail.

• Ideal for duplicating a variety of original models or patterns.

• Easy to measure and mix - 1:1 mix ratio by volume - no scale required

• Low viscosity - captures excellent detail - no degassing necessary

• Resin cures to a bright white finish

 

Precautionary statements

• Causes skin irritation.

•   May cause an allergic skin reaction.

•   Causes eye irritation.

• Harmful if inhaled.

• May cause allergy or asthma symptoms or breathing difficulties if inhaled.

• May cause respiratory irritation.

• Suspected of causing cancer.

• May cause damage to organs (Olfactory organs) through prolonged or repeated exposure (inhalation).

Prevention Precautions

•   Obtain special instructions before use.

•   Do not handle until all safety precautions have been read and understood.

•  Do not breathe dust/fume/gas/mist/vapors/spray.

•  Wash skin thoroughly after handling.

• Use only outdoors or in a well-ventilated area.

• Contaminated work clothing should not be allowed out of the workplace.

• Wear protective gloves/protective clothing/eye protection/face protection.

[In case of inadequate ventilation] wear respiratory protection.

• These products are stable at room temperature in closed containers under normal storage and handling conditions.

• Hand Protection.

•  Eye Protection Safety glasses with side shields per OSHA eye- and face protection.

•  Contact lenses are not eyed protective devices.

• Protective Clothing.

Never eat, drink, or smoke in work areas. Practice good personal hygiene after using this material, especially before eating, drinking, smoking, using the toilet, or applying cosmetics. Wash thoroughly after handling.

For more:

• Link#1

• Link#2

• Link#3

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