# Compact Godet Pan Retention: Aluminum Pan Draft Angles, Springback Tolerances, and Hot-Melt vs. Rib Clamping
TL;DR — A pressed-powder pan only stays in its godet if geometry and process agree: the draft angle and the forming springback decide how the pan seats and how firmly it is captured, and the hot-melt or rib-clamping route decides how that seat is finished. The compact family records 16 catalog models with pan capacities from 1.7 ml to 20 ml, including a multi-pan layout of nine 0.9 ml pans. Pan retention is part of the project design, not a recorded catalog detail — the angles, tolerances, and bond methods below are engineering guidance, configured and confirmed per project.
Why: The Pan That Moves Is the Compact That Fails
A compact's first job is to keep its formula where the user can reach it, which means each pan has to sit still — through assembly, through opening and closing, through a coat pocket on a commute:
- The pan is the product's floor. If the pan shifts inside its godet, the powder cracks, the applicator rides unevenly, and the whole compact feels wrong from the first touch;
- Fit is a geometry problem before it is a process problem. A pan that seats on draft and taper holds itself; one that fights its socket swells the housing or lifts at the rim;
- Bond is a process problem. Whether the pan is glued in or clamped in changes how it fails later — adhesive creep and rib wear are different failure modes with different fixes;
- The program documents the family, not the mechanism. Catalog models and pan capacities are recorded; the retention design for any given compact is a project decision.
How: Retention as Geometry plus Process
3.1 What the compact family actually documents
The compact family records 16 catalog models, with pan capacities measured from 1.7 ml to 20 ml, including a multi-pan layout of nine 0.9 ml pans. The base substrate of each compact is a project-level configuration, with no fixed material sheet claimed. These are the documented anchors of the family.
3.2 The godet: retention is project design, not a catalog record
Pan retention — the godet structure and its capture mechanism — has no entry in the catalog records. It is built into each compact's construction and therefore falls to the project to specify. Nothing is recorded for the retaining system itself: no material, no structure, no geometry. The aluminum pan is an industry-common component concept — aluminum is a registered material, and pans made from it are standard across cosmetic compacts — but the way any pan is held in place is a matter of project design, not a documented catalog detail.
3.3 Draft angle and springback: the geometry pair
Pan capture leans on two geometry facts that are working knowledge of any press-formed part:
- A seating taper (draft) lets the pan slide into its socket to a defined depth and holds it there against lateral motion. Too little draft and the pan may not seat fully; too much, and it can rattle in its socket;
- A stamped aluminum pan springs back after forming, so the as-pressed dimension differs from the tool dimension. The interference between pan and housing must land in a practical band: enough to capture the pan through drops and handling, little enough to avoid distorting the pan or stressing the housing.
Neither angle values nor tolerance numbers are published — both are set and confirmed against the specific part geometry and material pairing in each project.
3.4 Hot-melt vs rib clamping: two ways to finish the seat
When geometry alone does not guarantee capture, the project picks a bonding or clamping route:
- Hot-melt bonds the pan into the housing with a molten adhesive. It tolerates looser fits, but it brings its own risks: the adhesive can squeeze onto the rim, degrade under sustained heat, or creep under long-term closure;
- Rib clamping holds the pan with molded ribs that press against the pan flange or rim. It needs no adhesive and holds well under shear, but it depends on tight tolerances and can stress-crack housing corners in thin-wall constructions.
The choice — and the bond recipe after the choice — is made against the formula and its fill temperature, the refill strategy where the compact is refillable, and the drop performance target.
3.5 Verification: drop, torque, and seal
Retention is verified where it actually fails. Drop testing checks that the pans do not come loose when the closed compact takes a shock; torque testing checks the open/close behavior that moves and stresses the pans on every use; leakage and vacuum testing check that pan seating never opened a path in the sealed system. All four are documented capabilities of the program (capability-level, no parameters published).
<pre class="language-mermaid"><code>flowchart LR
A[Compact case<br/>16 catalog models, pans 1.7–20 ml] –> B[Godet pan housing<br/>retention = project design, not catalog record]
B –> C[Geometry<br/>draft angle + springback, per project]
C –> D[Bond route<br/>hot-melt or rib clamping, per project]
D –> E{Verification<br/>drop + torque + leakage/vacuum}
E –> F[Release per project]
</code></pre>
What: Verified Program Data and the Verification Hooks
- Product family: the compact family records 16 catalog models;
- Pan capacities: measured across the family from 1.7 ml to 20 ml, including a multi-pan layout of nine 0.9 ml pans;
- Base substrate: project-level configuration, with no fixed material sheet claimed;
- Component boundary: pan retention is part of the project design, not a recorded catalog detail; the aluminum pan is an industry-common component concept built on a registered material, while the godet retaining structure has no catalog record;
- Verification hooks (capability-level): drop test, torque test, leakage test, and vacuum test are documented testing capabilities, with no parameters published.
Gotchas
- Retention is not a catalog feature. No godet structure, material, or geometry is recorded; treat any specific retention design as a project obligation, not a documented fact.
- No published tolerance values. Draft angles in degrees, springback in millimeters, and adhesive amounts are per-project values — anything quoted from memory is fabrication.
- Geometry and bond each have their own failure mode. Rib clamping fails by tolerance stack and stress concentration; hot-melt fails by creep and squeeze-out; they are not interchangeable drop-in routes.
- Pan seating interacts with the sealed system. In a multi-pan layout, a single proud pan can hold the lid off its neighbors — validate seating and sealing together, not as separate checks.
- Capacities are recorded; retention is not. The measured pan range (1.7–20 ml) is real; the holding behavior of a specific pan in a specific housing remains per-project configuration and test.
Related Resources
- Category: Compacts
- Related insight: Airtight Cushion Compacts: Gasket Creep & Pan Sealing · Magnetic Closure Luxury Compacts · Compact Mirror Silvering & Corrosion · Cushion Compact Hinge 1000-Cycle Degradation · Cushion Sponge Cell Architecture · The 12-Test Lab Matrix
- Quality & Testing Capabilities — drop, torque, leakage, and vacuum testing