Post-Cure and Pigments on a Food-Contact RTV Tray
A food tray that looks right can still fail a document check if the color or post-cure is not the article the lab tested. If you are locking pigment and oven time on a platinum RTV food mold, this page is that process: which compound, which color lot, which post-cure record. Post-cure is not a stamp. Craft mica is not a food pigment.
RUUIPON pours platinum food-contact RTV in Bao'an, Shenzhen (Licheng Technology Industry Park, Xinhe Blvd, Shajing; USCC 91440300MA5FAXCN9W) since 2018. Simple 3D is USD 50 when that CAD scope applies. Prototype is 3-7 business days after CAD lock. Production is MOQ 20 pieces per design.
Where this page sits
What "food-grade" means, and 21 CFR 177.2600 vs LFGB sections 30/31, lives on food-grade silicone molds and materials and compliance. The copy-ready RFQ fields are food-grade buyer spec. This page covers post-cure and pigment on the finished RTV article.
Post-cure follows the compound
Some platinum food programs post-cure to cut residual volatiles, settle odor, or prepare a specimen the lab will extract. The schedule comes from the selected grade, section thickness, and the test program - not a shop habit. There is no universal 100 C / 4 hour rule. A thick jacketed tray and a thin ice pocket do not share one oven time just because both are platinum.
Post-cure can be part of a controlled process. It does not by itself prove food-contact suitability, all-color coverage, long acidic immersion, or oven durability. Evidence still has to match the dump, the color, and the market.
Pigment is part of the article
For a colored food tray, lock pigment supplier, code, lot, loading, and whether that color sits on the same document chain as the base compound. A Pantone chip is not the specification. Craft mica, a hobby paste, or a leftover industrial tint is the wrong object for a food cavity.
Natural / translucent rubber can simplify pigment control. It is not automatically "more compliant." It still needs the food-contact formulation, process, and evidence for the use you named.
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 |
|---|---|
| Cure chemistry | Platinum addition-cure RTV (1:1 or 10:1 by grade) |
| Cavity Shore | Often 10A-20A food trays; jacket if loaded |
| Post-cure | Follow the selected compound and test program - no universal hours |
| Color | Controlled food-contact pigment or natural; lot on the job card |
| US evidence (when named) | 21 CFR 177.2600 extraction of the finished article, not a factory stamp |
| EU / DE evidence (when named) | LFGB sections 30/31 / BfR XV path on the production color |
| 3D / CAD | USD 50 when that modeling scope applies |
| Prototype after CAD lock | 3-7 business days |
| Production after written pass | MOQ 20 pieces per design |
| Contact | [email protected] · +86 135 3006 2969 |
Records that tie color to the lot
On a higher-control job we can keep: grade, material lot, pigment lot, mix ratio, cure date, post-cure batch, mold / job ID, and wash status. That is how you later answer whether the PDF belongs to the 20 trays on the pallet. A spatula TDS from another SKU does not close that chain.
Color transfer and sensory
Depending on use, a buyer may check visible bleed, odor, taste, extractables, and color stability. A deep red long-contact beverage part and a light blue chocolate tray should not share one validation assumption. Name the dump and the market before we mix color.
Worked example: pigmented chocolate tray
Typical job, not a named PO. Buyer wanted a red food tray and sent a craft mica photo. We refused the mica, locked a food-contact pigment lot on the same platinum grade, post-cured to the compound note, and held MOQ 20 until the document pack named that color. USD 50 3D applied only because the logo still needed a lock into the cavity map.
When this page does not apply
This process page does not replace materials and compliance or the buyer spec. It does not apply to resin, wax, or CP soap trays - those are not food-contact dumps. It does not apply to an HCR / LSR food part - that is an HTV product RFQ here, or ask us for a high-volume LSR tool. A catalog ice shape that already matches does not need a pigment debate.
RFQs we will not accept as-is
Treating one post-cure oven time as proof the tray is food-contact. Craft mica or an uncontrolled paste on a food cavity. Copying a spatula PDF onto a different production color. Asking for an FDA-approved factory claim. Sending an HCR / LSR food part through this RTV process page.
Matched next step
Send dump material and peak C, destination market (US / EU / craft-only), natural vs pigmented, and whether a color lot is already locked. We will say which post-cure record and pigment line belong on the job card. "Food-grade, make it red" is not enough.
Send dump, market, and color for process lock · Materials and compliance · Buyer spec · Food-grade molds
[email protected] · +86 135 3006 2969 · Licheng Technology Industry Park, Xinhe Blvd, Shajing, Bao'an, Shenzhen. USCC 91440300MA5FAXCN9W.
FAQ
Is post-cure the same as food-grade? No. Post-cure is a process step. Suitability is compound + use + evidence.
Can we skip pigment control if the base is food-contact? Not if production is a different color. The article includes the pigment.
Do you hang FDA/LFGB on resin or wax trays? No. Those dumps are not food-contact.
Is this the buyer-spec page? No. The checklist lives on the buyer-spec URL.
What is MOQ after a pass? 20 pieces per design. USD 50 3D only if we still have to model.