In this episode, Adrian and Paul unpack IK ratings, what they measure (impact energy in joules), how they differ from IP ratings, and how to translate a fuzzy requirement like “make it rugged” into materials, geometry, and a test plan that reliably hits IK06–IK10 targets in real-world use.
This helps hardware teams moving from prototype to mass production who need housings/enclosures that survive drops, knocks, and tool strikes without functional failure.
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What you’ll learn in this episode
- IK vs IP: why dust/water ingress protection is different from impact toughness
- How the IK00–IK10 scale maps to impact energy (J) and typical product environments
- Material shortlists by target IK (PP/HIPS/ABS → PC/ABS/modified PA)
- System-level design levers that actually move IK results (thickness, ribs, radii, gate/weld lines)
- How to build a practical verification plan, including environmental factors (temperature, UV, chemicals) and sample counts
Episode Sections:
- 00:12 – Introduction: designing for toughness via IK rating
- 01:58 – IK vs IP: ingress ≠ impact toughness
- 05:16 – What is IK? Impact energy (J); Izod/Charpy context
- 08:33 – IK scale overview: IK00 → IK10 (~20 J)
- 09:18 – Start with real-world use before materials
- 10:15 – Low-impact examples (e.g., light switches)
- 11:56 – Mid-impact examples (bench drops, tools falling)
- 12:50 – High-impact / IK10: sledgehammer territory
- 14:02 – Specify toughness explicitly: choose an IK level
- 17:02 – Mapping joules to IK (≈0.35 J to 20 J)
- 19:34 – Materials at IK06 (~1 J): PP, HIPS, ABS, PA
- 21:47 – Materials at IK09 (~10 J): high-impact ABS, PC/ABS, modified PA
- 25:51 – Designing for IK: thickness, ribs, radii
- 27:18 – Molding realities: gate location, weld lines
- 29:26 – Environment trade-offs: temperature, UV, chemicals, cost
- 33:14 – Same IK, different designs: oil vs building site
- 35:16 – Key takeaway: IK is a system rating
- 35:40 – Wrapping up
Key takeaways
- Don’t say “rugged,” specify an IK level tied to real-world abuse.
- IK is a system rating, not a material number: geometry + molding + assembly all matter.
- Validate under environmental extremes (temp/UV/chemicals) and define pass/fail clearly.
- Budget time and units for design–test iterations to confidently hit IK targets.
Extra resources to dive deeper
- Power Tool Plastics (ABS vs PC/ABS vs PA66-GF)
- Plastic Enclosures for Electronics Projects (Plastics Sourcing Guide)
- What type of reliability testing is helpful pre-production?
- How Many Samples To Test for Reliability & Compliance
- Do You Need a Customized Reliability Test Plan?
- Drop Testing: 3 Tests That Can Save You Money
- How Reliability Testing Is Critical To Obtaining Great Mass-Produced Products
- Test To Failure: Why You Need This Reliability Test
- How Many Prototype Iterations & Tests Do We Need?
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