← Test Library
Internal engineering test · Method: ASTM F2933 / CPSC-derived
US Surface Firmness Test
Scheduled — no results yetCS-TST-002
- Product revision
- CS-MATTRESS-2026-08-A
Internal engineering test — not an EN, ASTM, CPSC or medical certification.
What are we testing?
Does the finished surface compress excessively under the US firmness fixture concept?
Why this test matters
- The US mandatory crib-mattress rule (16 CFR Part 1241 / ASTM F2933) includes a firmness method built around a weighted fixture and feeler element.
- The concept transfers meaningfully to a family mattress as an engineering benchmark, outside the rule's product scope.
Method basis
Internal comparative test derived from the CPSC-documented firmness fixture concept: nominal total mass 5.2 kg, 203 mm circular bottom contact disc, with a feeler element detecting whether the surface rises around the load. ASTM F2933-25 (effective under 16 CFR 1241 on 3 May 2026) added/clarified fixture requirements — our final internal protocol will be reconciled against the current read-only standard before testing. The product is outside the crib-mattress scope and carries no ASTM/CPSC certification.
Planned procedure (draft protocol)
- 1Verify fixture mass and critical dimensions on camera.
- 2Mark test positions: centre, quarter points, identified softest/worst-case location.
- 3Add family-bed positions above module transitions and across the width — clearly labelled as additional internal locations, not ASTM-required locations.
- 4Apply the fixture at each position; record the feeler outcome without cuts on video.
What will be recorded
- Fixture outcome at each position
- Worst-case location result
- Unedited video of each run
Result
Scheduled
This test has not been run yet under the current documentation protocol. No result is published until a dated, signed internal test record exists for the stated product revision.