Week10 : Molding and Casting
Group work
Review on SDS(Safe Data Sheets) of casting materials and test molding them.
Materials
Silicone
Durometer Shore Hardness Scale
Mold Start 16 fast
What matters :
Mix-ratio : 1A : 1B by volume
Pot-time : 6min
Cure-time : 30min
Mold Star SORTA Clear 37 A
What matters :
Mix-ratio : 1A:1B by volume or weight
Pot-time : 25min
Cure-time : 4h
Urethene
Smooth-Cast 300
What matters :
Mix-ratio : 1A : 1B by volume (10A : 9B by weight)
Pot-time : 3min
Cure-time : 10min
Smooth-Cast 325
What matters :
Mix-ratio : 1:1 in waight
Pot-time : 2.5min
Cure-time : 10min
Colorants & releaser
SO-Strong 9-pack Color Sampler
Only applicable for urethane materials.
Application
Using a soft brush, brush the release agent over all surfaces. Allow to dry for 10 minutes.
Reviewing SDS
Composition / ingredient
CAS (Wikipedia definition)
A CAS Registry Number,[1] also referred to as CASRN or CAS Number, is a unique numerical identifier assigned by the Chemical Abstracts Service (CAS) to every chemical substance described in the open scientific literature
You may look for the info about the material on google by asking like “cas: 101-68-8”.
Hazard identification
GHS Hazards classifications (Wikipedia)
Hazard statements form part of the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). They are intended to form a set of standardized phrases about the hazards of chemical substances and mixtures that can be translated into different languages.
You can check the full list of hazard codes on wikipedia.
A hazard statement is assigned to a hazard class (physical, health, or environmental) and category (1, 2, 3, or 4).
EXAMPLE: Flammable liquids (Physical Hazard)
Category 1: Extremely flammable liquid and vapor
Category2: Highly flammable liquid and vapor
Catagory 3: Flammable liquid and vapor
Category 4: Combustible liquid
Disposal regulations
It is stated in SDS to follow the RCRA laws to dispose the material. For the detail of RCRA, refer to the link below.
Resource Conservation and Recovery Act (RCRA) Laws and Regulations
Testing
First of all, we casted a small amount of material as a test. We have done this for all the material we had at the lab.
Here are the result.
- Mold Star16 fast
Bit sticky, though smooth enough to spread through the mold. Comparatively less bubble. - Mold Star SORTA Clear 37
Highest viscosity among all. High transparency, but very hard to get rid of bubbles. - Smooth-cast 300
Product like finish without polishing. Curing time is especially short. - Smooth-cast 325
Rough surface compared to 300. Difficult to take away the bubbles. Hard.
References
What you need to know about GHS
Individual page
Back to grouppage Top