Preserve the original density recommendation
Memory Foam Cushion density and SH specifications begin with a careful reading of the client source. It records recommended density ≥50 kg/m³, pending grade-specific confirmation. That notation should be retained as a recommendation pending evidence, rather than rewritten as a universal supplied minimum or a confirmed material-grade table.
Density describes mass relative to volume for an identified specimen. Request the grade, sample identity, measurement method and tolerance with the result. If the record refers to another construction or thickness, note that distinction. A total cushion shipping mass cannot substitute for a density measurement because its geometry and other components also contribute.
Ask why the recommendation appears in the source and which application or grade it describes. The current knowledge base does not resolve that context. A buyer can use it to frame a technical question, but should not create imagined intermediate grades, stock positions or support ratings from the symbol ≥.
- Preserve the original density recommendation as a source field, not a universal supplied minimum.
- Keep typical and custom SH contexts in separate entries.
- Request the original TDS definition before using SH as a quantitative comparison.
The Memory Foam Cushions product hub connects the data request to a proposed cushion. Attach the drawing and layer stack so the reviewer knows whether the specimen is intended as a contact layer, a complete single-material cushion or part of a composite proposal.
Keep density separate from recovery, comfort and durability. A sample can have an identified density while the seat function and environmental questions remain unresolved. A useful technical sheet clarifies one field at a time; it does not make every desired seating outcome an established result.
Keep SH undefined until its scale is identified
The source labels SH16–30 as the typical range and SH16–35 in the customization description. Keep the typical and custom contexts separate when requesting a proposed grade. The current record does not define the SH scale or map either context to an approved supplied grade. Preserve the symbol and its original context together. Do not label it Shore C simply because another cushion or rubber family uses that term.
Request the original technical record from the client or proposed grade owner. Ask for the scale, method, instrument or procedure, specimen thickness, conditioning and tolerance. A number has limited comparison value when the test context is missing. The correct next action is clarification rather than an invented conversion.
A polyurethane cushion ILD record is not a replacement for SH. The PU source supplies a separate 25% ILD notation with force and area, while the memory source does not define SH. Combining the two into a single firmness scale would erase the evidence boundary and create a false relationship between different source records.
If a supplier proposes another notation, retain both labels and ask which one identifies the proposed material. The technical owner should explain whether the records are comparable. Procurement should not choose the label that appears more familiar and discard the unresolved original.
Keep the SH label beside the proposed material identity until the technical owner supplies its definition. A quotation should distinguish typical information from a requested custom option and identify which fields remain pending. A familiar-looking symbol is not enough to establish a comparable firmness value.
| Decision field | Record input | Review purpose |
|---|---|---|
| Density | Recommended ≥50 kg/m³; grade-specific confirmation pending | Do not treat as confirmed grade table |
| Typical hardness context | SH16–30; scale and method to be confirmed | Confirm the proposed grade and specimen |
| Customization context | SH16–35; grade applicability to be confirmed | Retain the custom scope; do not assume every grade is supplied |
| Method | Scale, specimen, conditioning and tolerance | No supported conversion to ILD/Shore C |
| Construction | Material layer and assembly identities | Data does not approve the whole seat |
Map typical and custom contexts to the proposed grade
Retain SH16–30 as typical information and SH16–35 as the customization context stated in the source. That distinction explains why the two endpoints differ in the description; it does not establish which grades are available. Ask the technical owner to map the proposed sample to a scale, method and applicable range before either becomes a supply requirement.
Request a grade map linking each proposed sample to its technical sheet. The map should identify the source document revision, method, specimen and applicable tolerance. If the technical owner revises a range or its applicability, preserve the dated clarification with the quotation and sample record so later reviewers can distinguish the original description from the approved requirement.
Give procurement an interim field that says the value is to confirm. State the material family, proposed sample and unanswered notation question. This allows a quotation discussion to continue without making an unsupported number part of the accepted requirement.
Check that the drawing, sample label and technical record identify the same construction. A supplier may propose a layered cushion with a memory contact layer and another support material. The density or SH record should name which material it describes; it must not be assigned automatically to the whole assembly.
Do not merge the two contexts into a single universal purchasing band. A typical description does not authorize custom availability, and a customization range does not define every supplied grade. Ask the grade owner to confirm the applicable context and state what evidence permits the next review or release.
Compare methods and specimens before comparing numbers
Once the notation is identified, keep method and specimen fields beside every reported value. Thickness, conditioning, preparation and the measurement procedure can distinguish records that appear numerically similar. The comparison should make those inputs visible instead of ranking samples by the largest or smallest number.
Consult ASTM International and the ISO standards catalogue with the responsible technical owner for method terminology. These directories do not define the client SH symbol by themselves, certify a grade or prove that a Green Foams report exists.
Record which part of the construction was sampled. A loose contact material, a formed cushion and a layered assembly are not interchangeable descriptions. If a report is based on a specimen that differs from the seating sample, ask the engineer what question it can support and which assembled review is still needed.
The recovery and temperature review guide covers another set of conditions. Density or a clarified SH value does not eliminate the need to define preparation and loading history when discussing slow-response behavior.
The memory-layer record does not specify supporting materials or the complete seat. Show local thickness, retention, base and cover; route support-layer or cover changes to the affected assembly check while SH interpretation remains a separate material question.
Connect the record to a layered seating construction
The layered cushion brief keeps layer roles and interfaces traceable. Ask for actual material identities and bonding scope where those are proposed. Composite construction is a planning direction in the client source, while its specific conversion capability and compatibility require project-specific confirmation.
Use the memory seating selection guide when deciding the function of the contact and support layers. It helps frame the desired observation without turning a density recommendation into a user-weight, comfort or ergonomic claim.
Carry an undefined notation into a controlled clarification
Do not replace an unclear source label with a familiar scale. The purchasing record can preserve the original entry while its interpretation remains open. When the technical owner replies, retain both the original notation and the dated definition rather than overwriting the evidence trail.
| Record stage | Entry to complete | Release rule |
|---|---|---|
| Original source | [document and revision; typical or customization context] | Preserve original SH notation and its context |
| Proposed material | [sample, layer and grade identity] | Do not assign a layer value to the complete cushion |
| Clarification request | [ask scale, method, specimen, conditioning and applicability] | SH remains undefined until the record owner responds |
| Owner response | [dated definition and supporting TDS/report reference] | Copy what the evidence actually establishes; do not infer conversion |
| Approved purchasing field | [confirmed notation, method, grade and agreed requirement reference] | Enter only after the responsible technical review |
| Still unresolved | [scale / method / grade map / tolerance / other] | Keep quantitative acceptance pending for the affected field |
Categorical example: a reply that identifies the proposed grade but does not define the scale resolves identity only. The SH comparison stays open. A reply that defines the notation but provides no agreed supply tolerance does not authorize inventing one.
- Retain the source density recommendation pending grade-specific confirmation.
- Keep the typical and customization SH contexts separate.
- No confirmed scale means no SH-to-ILD or SH-to-Shore C equivalence.