01
Project snapshot
XGRAPHENE has an existing eye-mask sample combining a graphene heating layer, a six-layer textile assembly and timed three-setting controls. Use this configuration as a concrete starting point for your OEM discussion. Review the sample against your product requirements, then define any changes to geometry, power, textiles, connections or optional NTC sensing.
- Product basis
- Existing sample available
- Layer stack
- Six layers from outer plush to contact-facing flannel
- Controls
- Published timed operating cycle with three temperature settings
- NTC sensor
- Not fitted in the standard sample; available as an OEM customization
- Measurement basis
- Product-sheet ratings; no measured contact-surface temperatures published
Review the existing eye-mask sample, then agree the configuration and validation for OEM changes.
02
Integration Challenge: A Working Sample, Not a Blank Sheet
The six-layer sample already combines the heating film, textile stack and timed controls into one assembled product. Start the review from that configuration, then define the footprint, terminations and validation your adaptation needs.
Integration requirements
- Fit the heating footprint around the nasal bridge and textile seams.
- Evaluate the contact-surface response at every published setting over the timed operating cycle.
- Preserve the documented foldable format while routing power connections away from concentrated strain.
- Account for heat transfer through the memory foam, inner Lycra and flannel between the heater and the contact surface.
Fig. 1 — sample in use
03
Form-Factor & Integration Constraints
Three physical constraints shape any OEM adaptation of this sample. They come from the published stack and the proposed verification work — not from a measured failure result.
B1
Foam compression changes the heat path
Heat reaching the contact face passes through the memory foam, the second Lycra layer and the flannel. Strap tension and foam compression change that path, so heater temperature alone does not describe what the skin-side surface does. Measure contact-surface response across the intended fit range at each published setting.
B2
Nasal cut-out and fold line concentrate strain
The nasal bridge cut-out, electrode ends and lead attachment concentrate current and mechanical strain in the same region. A smooth thermal image does not establish that a terminal survives repeated folding or cable pulls; resistance and thermal distribution must be checked before and after defined bend tests.
B3
Three settings and a timer, no NTC in the standard build
The standard sample has no NTC sensor: its published controls specify multiple temperature settings and a timed operating cycle. Stable behaviour at one point does not establish uniformity, and sensor-based protection only exists in an agreed NTC customization, where placement, thermal coupling, controller compatibility and fault response are defined per project.
Constraint labels describe the integration problem, not a test outcome.
04
The XGRAPHENE Solution: 3-Tier Wearable Stack
The sample shows one working arrangement of the three tiers. An OEM project keeps the hierarchy and re-decides each tier against the target product.
A. Planar circuit topology
The heating footprint is fitted around the nasal bridge and the textile seams, so the active area stops short of the highest-strain regions. Electrode ends and the lead exit are placed away from the fold line, and the circuit is checked for continuity and contact resistance before strain relief is accepted.
B. Multi-layer stack-up
Six layers in the order shown by the product sheet, from outer surface to contact surface. The heating layer sits above the memory foam in this published stack.
| Layer | Role in the published stack |
|---|---|
| 01 / Outer plush textile | Exterior fabric, described as milk fleece in the supplied product sheet. |
| 02 / Lycra | Textile layer on the outward-facing side of the heater. |
| 03 / Graphene heating layer | The active heating material, positioned between Lycra and memory foam. |
| 04 / Memory foam | Padding on the contact-facing side of the heater; its compression affects heat transfer. |
| 05 / Lycra | Second textile layer between the memory foam and flannel. |
| 06 / Flannel | Contact-facing textile at the end of the published layer stack. |
Outside → Contact surface
- 01Outer plush textile
- 02Lycra
- 03Graphene heating layer
- 04Memory foam
- 05Lycra
- 06Contact flannel
Heat from layer 03 passes through memory foam, inner Lycra and flannel to reach the contact surface.
Layer order as published in the product sheet. The sheet does not resolve the internal electrode or encapsulation construction.
C. Far-infrared radiative coupling (material level)
The heating layer is graphene, and far-infrared emission is a material-level property of that layer. No emissivity or wavelength figure is applied to this assembled mask: the NIQS film-sample emissivity report (2022)WT-HW-00529 describes a different film sample and does not establish this product's optical or thermal performance. Material-level figure; it does not establish field performance or biological efficacy.
05
Spec Benchmark: Published Sample Configuration
Values below resolve from the Evidence Registry records for the supplied product sheets. They describe the existing sample, not a customized build.
| Parameter | Published value | Status |
|---|---|---|
| Rated voltage and power | 5 V / 5 W | Registered product sheet |
| Recommended charging supply | 5 V / 2 A | Registered product sheet |
| Control settings and timer | 35 / 45 / 55 °C; 15 min | Registered product sheet |
| Product weight | 73 g | Registered product sheet |
| Heating material | Graphene | Stated in product sheet |
| NTC sensor | Not fitted; available on customization | Stated in product sheet |
Values are resolved from the Evidence Registry records for the supplied product sheets. Control settings do not establish measured contact-surface temperatures, and the charging-supply recommendation is separate from rated heating power.
Electrical interpretation / derived from registered ratings
1 A nominal load / 5 ohms equivalent / 1.25 Wh at 15 min
The published rating corresponds to a nominal 1 A load, 5 ohms equivalent resistance and 1.25 Wh for 15 minutes of continuous operation. These are reference calculations, not measured current, heater resistance or battery runtime; controller duty cycle and circuit losses affect actual operation.
The heating material is one part of the product. Film, terminals, sensing, controls and the textile assembly need an agreed supply scope for each OEM project.
06
Verification Plan & Evidence Scope
Use the sample as the starting point. Review fold lines, lead exits and foam compression together, then agree the verification needed before tooling and pilot production.
| Integration challenge | Physical mechanism | Proposed verification | Design decision |
|---|---|---|---|
| Uneven contact-surface temperature | Edge heat loss, foam compression or changing fit alters the local thermal path. | Map the contact region with external calibrated measurement equipment under representative contact loads at each setting. | Heating footprint, textile stack and operating settings. |
| Fold or terminal hotspot | Local resistance changes at an electrode end, bend line or lead joint. | Measure resistance and thermal distribution before and after defined bend and cable-pull tests. | Electrode geometry, exclusion zones and strain relief. |
| Insulation damage | Compression, moisture or abrasion compromises encapsulation. | Inspect edges and seams; define appropriate insulation testing before and after mechanical and environmental conditioning. | Encapsulation, edge seal and care instructions. |
| NTC fault in an optional customized assembly | Only for an NTC-equipped customization: a disconnected, shorted or detached sensor gives an invalid input. | For the customized design, inject defined sensing faults in a controlled setup and record the protective response. | Customized controller compatibility, fault detection and protection. |
Evidence scope
| Information | Source and scope |
|---|---|
| Product configuration | The Evidence Registry records the supplied product-sheet ratings, controls and weight for the existing sample. XGRAPHENE confirms that the standard product has no NTC. |
| Electrical reference calculations | The registered reference calculation is derived from published ratings. It is not a measured current, heater resistance or battery-runtime result. |
| Contact-temperature distribution | The coloured diagrams are conceptual. They do not establish measured uniformity, contact temperature or an achieved temperature tolerance. |
| Durability and design changes | The proposed tests and design responses are an engineering evaluation plan. Separate material-test records need a documented sample and configuration link before being attributed to this assembled eye mask. |
07
Thermal Interpretation: Uniformity Across the Contact Surface
Spatial uniformity describes variation across an area. Control stability describes variation over time at one location. They are different questions and need different measurements.
Product setting 35°C
Contact-facing view / SchematicProduct setting 45°C
Contact-facing view / SchematicProduct setting 55°C
Contact-facing view / SchematicT1
Spatial temperature spread
Maximum minus minimum temperature across a defined contact-surface region, at the same instant and operating condition. Define whether seams and the bridge are inside that region before testing.
T2
Temperature stability over time
Measure temperature variation at fixed contact-surface locations using external test probes. These measurement probes are test equipment, not built-in NTC sensors. Stability at one point does not establish uniformity across the mask.
T3
Transient response
Record warm-up, overshoot and recovery after a change in fit or contact load using external reference probes. Compare heater and contact-surface temperatures on a shared time axis over the timed cycle.
The measurement probes described here are external test equipment, not built-in NTC sensors.
08
Development Stage & Engineering Handoff
Existing sample available. Review the existing eye-mask sample, then agree the configuration and validation for OEM changes.
Handoff records
- Dimensioned stack-up with seam and bridge exclusions.
- Electrode and terminal drawing; NTC placement only for an agreed customized configuration.
- Definition of the contact-surface measurement region, external test probes and contact load.
- Synchronous electrical and temperature traces, with calibration records.
- Post-conditioning inspection and acceptance criteria.
Fig. 2 — sample folded
The sheets establish the published product configuration and specifications. The folding illustration describes its foldable format, not a cycle-life result. Thermal maps, sensor placement and fault-test outcomes are separate engineering results, not values inferred from the published control settings.
Discuss your OEM heating integration.
Share your product drawing, heating area, target temperature and electrical supply. Start with the existing sample and identify the adaptations your product needs.
Request an Engineering Evaluation09
Technical FAQ
Does a 45-degree setting mean 45 degrees at the contact surface?
A nominal temperature setting does not, by itself, define the contact-interface temperature. Actual temperature depends on heater output, through-plane thermal resistance, foam compression, contact conditions and environmental heat loss. The published settings do not establish the controller circuit or its duty cycle.
How does memory-foam compression affect thermal uniformity?
The memory foam sits between the heating layer and the inner Lycra and flannel. Compression can change layer thickness and thermal contact, altering the local heat path. The magnitude and direction of the temperature change require measurements on the assembled product under defined loads.
Why should the nasal bridge and terminals be checked for hotspots?
Geometry, electrical termination and local mechanical strain can affect current distribution and resistance. These are locations to investigate, not confirmed defects in this eye mask. Compare electrical measurements and thermal maps before and after defined mechanical conditioning.
How should dynamic flex-cycle reliability be evaluated?
Specify bend radius, direction, cycle count, electrical state and lead restraint. Record resistance and contact-surface temperatures before and after the sequence on identified assemblies. A folding product photograph does not establish cycle life, and a separate film-sample result cannot automatically be assigned to this eye mask.
Does the standard eye mask include an NTC sensor?
No. The standard eye mask has no NTC sensor. NTC sensing is available as an OEM customization, with sensor placement, controller compatibility and fault response defined for the customized assembly. External temperature probes used during testing are not built-in product sensors.
Do the three coloured mask diagrams show measured uniformity?
No. The diagrams illustrate the published 35, 45 and 55 degrees Celsius settings. They are not measured thermal images or numerical simulations. Uniformity requires a defined measurement region and simultaneous surface-temperature readings under stated operating and contact conditions.
10
