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“Platinum silicone” appears in almost every premium listing and is explained in almost none of them. This page covers what the cure type actually changes, what it is worth in money, and how to specify it without being talked around.
Silicone cures by a chemical reaction between a base polymer and a curing agent. In platinum cure (addition cure), a platinum catalyst drives the reaction and the only by-product is essentially nothing — the material cures cleanly and dimensionally stably.
In tin cure (condensation cure), a tin catalyst is used and alcohol is released as the material sets. That by-product is the origin of the smell people associate with cheap silicone, and it is also why tin-cure pieces can shrink slightly and change over time.
The headline: platinum is not a marketing word for “better silicone”. It describes a specific chemistry, and the differences follow directly from it.
| Platinum cure | Tin cure | |
|---|---|---|
| Odour | Essentially none | Alcohol smell while curing |
| Stability | Very low shrinkage | Can shrink slightly |
| Yellowing | Resistant | Yellows faster under UV |
| Paint adhesion | Excellent, long-term | Degrades sooner |
| Cost | Higher | Lower |
| Sensitivity | Inhibited by contaminants | More forgiving to work with |
Platinum’s one weakness is real: it is inhibited by sulphur, latex and some other contaminants, so workshop cleanliness matters as much as the raw material. Tin cure is easier to handle and is not automatically a bad choice for a low-cost line.
Cure type and softness are separate variables. Softness is set by the shore hardness specified in the pour, not by whether the catalyst is platinum or tin. A soft tin-cure piece and a firm platinum-cure piece are both perfectly possible.
What platinum does affect is how the material feels over time: it holds its original flexibility and surface quality far longer, whereas tin cure gradually stiffens and dulls. A doll that felt right in year one and feels different in year five is usually a tin-cure doll.
Handled well, platinum-cure silicone lasts for decades. It resists yellowing, keeps its elasticity, and holds paint adhesion much longer than tin cure — which matters because repainting a delaminated doll is difficult and often not economical.
What shortens any silicone baby doll’s life is largely environmental: direct sunlight (UV degrades both the silicone and the paint), solvent-based cleaning, and dark synthetic clothing left in contact with light skin. Those apply to both cure types; platinum simply starts with more margin.
Platinum-cure silicone costs more per kilogram, and it demands cleaner working conditions, both of which show up in the price. On a finished doll the premium is real but is rarely the dominant cost — the material is a minority of the total, against the finishing hours which are the same either way.
So the practical question is not “is platinum worth it” in the abstract but “is it worth it on this doll”. On a piece intended to be kept for twenty years, yes. On a low-cost line where the buyer is comparing on price alone, tin cure may be the honest specification — and we will say so. See the reborn doll price guide for how material and finishing split the total.
When ordering, specify cure type explicitly rather than asking for “good silicone”. A workable specification includes: cure type (platinum), shore hardness, sculpt, size, paint grade, hair type and colour, eye and mouth treatment, weighting target, and labelling.
We default to platinum for artist-grade and all export work, and will flag it on the quote so you can see what you are paying for. If tin cure is the right answer for your market, we will tell you that too. Requests start on the custom dolls page or via wholesale & OEM/ODM.
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FAQ
Silicone cured using a platinum catalyst rather than a tin one. The reaction produces essentially no by-product, so the material cures cleanly with very low shrinkage, almost no odour, and better resistance to yellowing. It is not a different grade of softness — hardness is specified separately.
On a doll you intend to keep for years, yes: it holds its colour, flexibility and paint adhesion far longer. On a low-cost line judged purely on price, tin cure may be the honest specification, and we will say so rather than upselling.
Yes. It resists yellowing and keeps its elasticity for decades where tin cure gradually stiffens and dulls. Both are shortened by the same things — direct sunlight, solvents, and dark synthetic dyes in prolonged contact.
Ask for the specification, not the adjective. A supplier should be able to state cure type and shore hardness. Platinum-cure pieces have virtually no odour and hold their surface quality; tin-cure pieces often smell faintly of alcohol when new.
Platinum costs more per kilogram and demands cleaner working conditions, so it carries a genuine premium. On a finished doll it is rarely the dominant cost, since the finishing labour is identical either way. The price guide breaks down how the total is built.
Yes — with cure type, shore hardness, paint grade, hair, weighting and labelling all specified, EXW or FOB. Our silicone ranges have no minimum order quantity. We default to platinum for artist-grade and export work.
Next step
Tell us the size, the material and the price band you are working to. We will tell you what we would run — and what we would not.
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