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.