https://www.avient.com/sites/default/files/2021-11/avient-design-ergonomic-design-guide.pdf
Common regulations
• REACH SVHC, RoHS 3 (EU 2015/863),
CA Prop 65, Heavy Metals (CONEG, 94/62/EC)
and Conflict Minerals
• Substances of Concern (could include
phthalates, latex, PVC, BPA, halogens, PAH,
flame retardants)
Other market-specific regulations
• Consumer Product Safety Improvement Act of
2008 (CPSIA)
- Lead and phthalate limits for products
designed for children
• Chemicals of High Concern for Children (CHCC)
- Several US states (OR, WA, VT, ME, MN) have
lists of chemicals of concern for products .
Top 10 Rules for Overmolded Components
1. .Match the chemistry of the TPE to the substrate for optimized bonding
2. .For new component designs, flow ratios (L/T) should be between 80:1 – 120:1
3. .Incorporate air vents between 0.0005" and 0.001" along the perimeter and/or at the end of fill
4. .Incorporate good flow shutoffs to prevent flashing
5. .Add surface texture to prevent sticking and to mask aesthetic defects
6. .Use a rigid substrate for easy ejection from the mold
7. .Ensure the TPE layer is thick enough to ensure good bonding.
