1. Progress Report: Materials Testing ManoTech Associates Jina Kim Forrest Liau David Lin Teresa Wang

2. Review of Project Goals Fulfills two criteria:  Low-cost materials  Anatomically user-matched Does not include:  Detailed hand aesthetics (color, texture, etc.)  Articulating joints

3. Progress Overview Interview with Charles Mathis “Clay Block” Materials Reversible Glove Possibilities

4. The 4-Step Process

5. Interview with Charles Mathis ManoTech met Charles last Thursday, 3/9 Watched and practiced making wax molds

6. Wax Advantages  Gives better detail and shape of hand in final mold  little shrinkage  Is relatively easy to use  Allows for mistakes Disadvantages  Must be maintained at 120 degrees F in a larger pot or deep-fryer

7. Kidz EZ Cast Mold Advantages  MoldGel sets in 4 – 5 min.  Works at room temperature Disadvantages  Lumpy mixture  Water leaks from bottom  Air bubbles reduce detail

8. 5-Minute Molding Putty Advantages  Not messy  Takes ~10 minutes to set at room temperature Disadvantages  Requires significant amount of material  Difficult to mold exactly around the hand and maintain shape

9. Mini Casting Kit Advantages  Comes in a kit Disadvantages  Vapor and powder is toxic  Requires 4 – 8 hours for mold to set around hand Cannot be used

10. Gypsum-based Plaster of Paris Advantages  Cures at room temperature in 1.5 hours  Retains detail of initial mold Disadvantages  Hardened material is brittle, easily cracked  Transfers bubbles and cracks to solid hand

11. Brushable Latex Advantages  Brushes on easily  Reversible  Maintains shape  Able to use leftover latex Disadvantages  Needs ~10 coats with a 20-minute incubation between coats

12. RTV Polyurethane Advantages  Very elastic  Potential to be reversed Disadvantages  30-minute pour time  Messy  By dipping, creates non-uniform layer  Dipping twice gave a thin coat that rips

13. Summary of Materials Initial Mold Solid Hand Reversible Mold Wax EZ Mold Molding Putty Casting Kit Plaster of Paris Brushable Latex RTV Polyurethane Prosthetic Hand Silicone Rubber Polyurethane Foam

14. Schedule TODAY

15. Future Plans Procedures  Improve reversible mold-making method Materials Optimization  Solid hand mold  Prosthetic Hardness & Elasticity Testing  Underlayer: silicone rubber  Reversible material: latex, RTV polyurethane