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10. Molding and casting

group assignment:

  • Review the safety data sheets for each of your molding and casting materials.
  • Make and compare test casts with each of them.
  • Compare printing vs machining molds.

Silicone

Zhermack Industrial Silicone rubbers for industrial applications (.pdf)

Name Colour Main Applications WT (@ 23°C) ST (@ 23°C) Hardness (ShA) Visc (cP) Tear (N/mm)
ZA 13 Mould WT45 translucid Mould making 45’ 4h 13 4.500 10

The properties of ZA 13 Mould WT45 are as follows: ​​

  • Colour: Translucent
  • Main Applications: Mould making ​
  • WT (@ 23°C): 45 minutes
  • ST (@ 23°C): 4 hours
  • Hardness (ShA): 13 ​
  • Visc (cP): 4,500
  • Tear (N/mm): 10 ​

These properties indicate that ZA 13 Mould WT45 is a translucent silicone material primarily used for mould making. ​ It has a working time of 45 minutes at 23 degrees Celsius and takes approximately 4 hours to fully cure. The material has a hardness of 13 on the ShA scale, indicating a relatively soft and flexible texture. It has a viscosity of 4,500 cP, which suggests that it is relatively thick and has good flow characteristics. The tear strength of 10 N/mm indicates that it has good resistance to tearing or breaking under stress.

Here is a link to the Safety Data Sheet for this Silicone: - ZA 13 Mould WT45 Safety Data Sheet

The AI asssistant in Acrobat listed this text from the document:

  • ZA 13 MOULD WT 45 CATALYST is a mixture used for industrial/professional mold making.
  • The product is not classified as dangerous according to Regulation EC 1272/2008 (CLP).
  • The hazardous components in the mixture are Dodecamethylcyclohexasiloxane- D6 and octamethylcyclotetrasiloxane; [D4].
  • Safety precautions include:
    • Washing with water and soap for skin contact
    • Rinsing with water for eye contact
    • Seeking medical advice for eye contact
    • Not inducing vomiting for ingestion
    • Seeking medical examination for ingestion
  • The product is not classified for chronic aquatic hazard, but the main substances have aquatic acute toxicity and are not readily biodegradable.
  • The safety data sheet has been updated in compliance with Regulation 2020/878 and provides information on hazard classes and categories.
  • The classification procedure for Aquatic Chronic hazard is based on conclusive scientific experimental data.
  • The document was prepared by a competent person and includes definitions for various acronyms and terms related to hazardous substances.

Hydro Stone

https://plaster.com/product-comparison-chart/

individual assignment:

  • Design a mold around the process you’ll be using.
  • Produce it with a smooth surface finish.
  • Use it to cast parts.
  • Extra credit: Use more than two mold parts.