Pour Chemistry and Peak Temperature Lock Before Shore

A Shore number with no chemistry and no peak °C is not a material spec. If you're quoting an RTV cavity, lock what goes in the pocket first: pectin, gelatin, chocolate, epoxy, UV resin, wax, CP soap, plaster, concrete - and the highest temperature that rubber will see. Sticky pectin and hot epoxy are different production sheets. We would not select silicone from Shore A alone. A thick 25A wall can feel stiffer than a thin 40A lip; neither fact is a pour spec.

Custom/simple 3D is USD $50 when that scope applies. Prototype 3-7 days after CAD lock in the real dump. MOQ 20 per design. Pair with vacuum platinum and materials. Catalog: process catalog. LSR part grades → an HTV product RFQ here.

Chemistry before durometer

Dump	What it does to the sheet	Typical call
Pectin / gelatin	Sticky peel, heat cycles	Platinum food path, 10A-20A, jacket
Chocolate	Temper, logo wash	Platinum food path, finish freeze
Epoxy	Peak C, inhibition risk	Platinum, vacuum, don't mix with UV wells
UV resin	Lower heat, show-through pits	Platinum, vacuum, clear-face QC
Wax / soap	Fragrance oils, alkali	Platinum or tin only if craft and named
Plaster / concrete	Mass, abrasion	Platinum, jacket, often a core

Tin hobby kits age sticky under shop heat. Production default is platinum + vacuum.

Common mix-up: one Shore for soap and chocolate

Don't send three pour families on one STL and ask for one Shore. We split the quote. Peak °C is not an average.

Typical shop values

Reference values only. Confirm material-specific limits against the supplier’s technical data and agree project acceptance criteria before production.

Item	Typical shop value
Mix	Platinum 1:1 or 10:1; vacuum until foam collapses
Cavity Shore	10A-20A unless the pour says otherwise
Shrink	~0.1-0.3% platinum
Prototype	3-7 days after lock in the named dump
MOQ	20 per design
Custom/simple 3D	USD $50 when that scope applies

Failure: Shore frozen, dump changed

Symptom: Epoxy on a chocolate sheet; tin on pectin restock; UV wells and 70 mm epoxy averaged to one peak C.

Confirm: Named chemistry on the PI? Prototype in that dump? Food vs craft?

Fix: Re-lock chemistry. Recast. Don't nudge Shore to hide the wrong grade.

Worked example: pectin 80 °C dump vs UV 3 mm wells

Two PIs. Pectin: food-contact platinum, jacket, sticky peel DFM. UV: vacuum, clear-face pits, lower peak C. Mixing them on one 20A sheet would have failed both. Prototypes 3-7 days after each lock, MOQ 20 each.

What to ask when you're locking pour

Peak °C written, not "room temp-ish"?
Sticky / fatty / abrasive notes?
Food path or craft?
Will Shore be chosen after this lock?
Same sheet for two chemistries? (Usually no.)

When this lock is the wrong form

You already run one frozen dump and only need recasts. LSR part oil resistance: an HTV product or mold RFQ here, or ask us if you need a high-volume LSR cold-runner tool. Geometry can override: a one-off hot-epoxy sculpture still needs peak C.

Related: DFM, contact.

RFQ: chemistry first

Copy this.

Dump material (one family per line): Peak temperature (°C): Sticky / fatty / abrasive: FOOD-CONTACT or craft Shore: shop after chemistry 3D at $50 in scope? Prototype in this dump, 3-7 days after lock, MOQ 20

Send chemistry and peak °C before Shore. contact - [email protected] · +86 135 3006 2969.

We would not recommend averaging peak C across SKUs. We would not recommend tin as the production default for pectin or epoxy. We would not recommend water as the prototype dump.

RUUIPON Mold Structure Decision:

Food? - yes -> Platinum food path
Food? - no -> Platinum production default
Platinum food path -> Then Shore / jacket
Platinum production default -> Then Shore / jacket
Then Shore / jacket -> Prototype in real dump

FAQ

Can one hardness work for every dump? Not if chemistry and peak C differ.

Is peak C the depositor set-point? It's the highest the rubber sees, including hot fills and ovens. Write the worst case.

Does chemistry change split? Viscosity changes gates and vents. Undercuts still need split.

Vacuum tied to chemistry? Clear resin and logo faces: yes.

MOQ? 20 per design.