Silicone Rollers: Heat and Non-Stick

Q: Why doesn't anything stick to silicone?

Because its surface has very low energy: liquids and molten materials can't spread on it or grab hold of it. A hot adhesive, a heat-sealed film or a wet coating releases cleanly from silicone where it would stay stuck on most other elastomers.

And what it doesn't do

The half the sales sheets leave out. Silicone pays for its three strengths with real mechanical weakness — knowing that up front avoids expensive disappointments.

We choose it for

Its three territories

La chaleur — thermoscellage, lamination à chaud, sortie de four, cycles thermiques répétés.
Le relâchement — tout ce qui doit se décoller proprement : adhésifs, films fondus, enduits.
La pureté — contact alimentaire, pharmaceutique et cosmétique avec les grades appropriés.
Le diélectrique — contre-électrode des postes corona, avec la réserve d'usure honnête ci-contre.

We rule it out when

Its real limits

Coupure et déchirure — parmi les plus faibles des élastomères. Rives de produit, couteaux, arêtes : le silicone s'entaille vite.
Abrasion — nettement inférieure au nitrile et sans comparaison avec le polyuréthane. Produits abrasifs à éviter.
Charges élevées — sa résistance mécanique modeste le disqualifie des nips fortement chargés.
Certaines huiles et solvants — il gonfle notamment au contact des huiles silicone; la compatibilité se valide par essai.
Le coût — sensiblement plus cher que les caoutchoucs courants. On le réserve aux postes qui l'exigent.

Critère	Silicone	Nitrile	EPDM	Polyuréthane
Température élevée	Excellent	Limité	Bon (eau chaude, vapeur)	Limité
Relâchement / antiadhérence	Excellent	Faible	Faible	Faible à moyen
Abrasion	Faible	Bonne	Moyenne	Excellente
Coupure / déchirure	Faible	Bonne	Moyenne	Excellente
Charge mécanique	Limitée	Bonne	Bonne	Excellente
Propriétés diélectriques	Excellentes	Faibles	Bonnes	Variables selon formulation
Grades alimentaires	Oui, courants	Nitrile blanc FDA selon le cas	Oui, selon grade	Selon formulation

Qualitative comparison, for guidance only: every cell is validated by grade and by application. The detail on each family is in the material selection guide and on the pages for rubber rollers and polyurethane rollers.

La règle de sélection

If your position calls for none of these —

extreme temperature, release, food compliance, or any particular dielectric or aging-resistance properties

— silicone probably isn't the first material to consider: a nitrile, an EPDM or a polyurethane will give better mechanical strength and a better life-cycle cost. That's exactly the kind of trade-off we work through with you instead of selling you the most expensive material.

The rollers we cover in silicone

The positions where its three territories — heat, release, purity — are the very definition of the job.

Deux rouleaux recouverts de silicone orange mat — Le même silicone, deux constructions : à gauche un rouleau sur **arbre traversant** à tourillons étagés, à droite un rouleau à **alésage claveté** qui se monte sur un arbre existant. Dans les deux cas, la coupe au bout montre l'épaisseur du recouvrement sur son mandrin — et le fini mat caractéristique du silicone rectifié.

Heat sealing rollers — heat seal rolls

Welding a film under heat and pressure without the seal sticking to the roller. Silicone's signature position: bag making, flexible packaging, lidding.

Hot laminating rollers — hot laminating rolls

Bonding layers together under heat while releasing the molten adhesive cleanly. Heat resistance and non-stick working together.

Corona treater rollers — corona treater rolls

The insulating backing roll of the corona station. Excellent dielectric properties and good aging resistance — but the cover is still exposed to electrical stress, localized heat and accidental arcing : its integrity has to be monitored.

Food contact rollers — food grade rolls

Conveying, transfer and processing in direct contact with the food, with FDA-compliant grades and a surface that cleans without soaking anything up.

Hot product contact rollers — hot product contact rolls

Picking up, guiding or transferring product that's still hot without sticking to it or marking it. Note: silicone is chosen here for its heat resistance and its release, not to cool — it's a relative thermal insulator, which sets it apart from a true metal chill roll.

Oven exit rollers — oven exit rolls

Picking up product that's still hot — a varnished panel, a painted part, a coated textile — without marking the finish or sticking to it.

Release applicator rollers — release / coating rolls

When the applied product has to transfer completely to the substrate instead of staying on the roller. See also applicator rollers.

Textile calender press rollers — textile calender rolls

Repeated heat and pressure on the fabric, with no unwanted glazing and no transfer. Grades are selected to the calender temperature.

Silicone sleeves — silicone sleeves

Interchangeable sleeves to change function without tying up the machine — common on corona and sealing stations.

Shrink packaging rollers — shrink packaging rolls

Heated films that shrink on contact: the roller has to take the heat and release the film every cycle.

Does your position combine heat and tack some other way? Describe it to us — the function decides, not the name. See also other roller families.

What Soremag does on a silicone roller

We start from your core — and with silicone, the bonding system is half the job.

Intervention	Ce que ça règle sur un rouleau silicone
Choix du grade	Plusieurs grades disponibles : dureté, tenue thermique, conformité alimentaire FDA et propriétés diélectriques s'ajustent au poste.
Adhérisation spécifique au silicone	La faible énergie de surface qui rend le silicone antiadhérent le rend aussi difficile à coller : préparation et primaires dédiés, sans quoi le recouvrement se décolle sous cycles thermiques.
Recouvrement et vulcanisation	Application du grade retenu sur votre mandrin existant, du souple au ferme — typiquement de l'ordre de 30 à 80 Shore A.
Rectification de précision	Diamètre, cylindricité, faux-rond et fini adaptés — un rouleau de scellage marque la soudure s'il n'est pas rond.
Essai de compatibilité	Validation sur échantillon face à vos produits et vos nettoyants — le silicone a ses fluides ennemis, notamment les huiles silicone.
Réparation du mandrin, des portées et des tourillons	Les postes chauds fatiguent la mécanique autant que le recouvrement.
Caractérisation et rétro-ingénierie	Quand le rouleau d'origine n'est plus documenté : relevé de la dureté, des dimensions, de la construction et du mode d'usure, analyse des conditions réelles du poste, puis sélection d'un grade de remplacement approprié — avec essais de compatibilité lorsque l'application l'exige.
Contrôle et traçabilité	Dureté relevée sur la face, dimensions, faux-rond, fini — consignés pour la pièce, avec la documentation du grade alimentaire lorsqu'il y a lieu.

Capabilities: machining up to

Ø 42 in. × 240 in.

Ø 68 in. × 175 in.

Ø 76 in. × 36 in.

depending on roller construction · dimensional tolerances, runout and finish are defined by diameter, length, material and the requirements of the position —

critical requirements are validated before production

· several silicone grades, including FDA. See quality control.

The technical detail

What sets silicone apart on the inside — and what that changes in service.

Propriété	Valeur typique
Plage de température utile	−115 °C à +260 °C et plus (−175 °F à 500+ °F)
Dureté, Shore A	20 à 90
Résistance à la traction	jusqu'à 1600 psi (≈ 11 MPa)
Allongement à la rupture	jusqu'à 1000 %
Résistance à la déchirure	jusqu'à 300 ppi
Déformation rémanente à la compression	aussi basse que 8 %
Densité (gravité spécifique)	1,0 à 2,1
Résistivité volumique	10¹⁵ à 10¹⁷ Ohm·cm
Rigidité diélectrique	600 à 650 volt/mil
Constante diélectrique (60 cps)	3,0 à 3,5

General values for the silicone family (VMQ), all formulations taken together — to be validated grade by grade for your application. The

−50 °C to +200 °C

range covers the common grades used on our rollers; the extremes in the table (up to +260 °C) belong to the specialized formulations of the silicone family in general.

Pourquoi il tient la chaleur : le squelette Si-O

Organic rubbers are built on carbon-carbon chains; silicone, on chains of

silicon-oxygen

. That bond is more stable at high temperature: where organic chains oxidize, harden and break, silicone keeps its flexibility.

The same backbone stays flexible in deep cold — that's why the service range extends in both directions: on the order of −50 °C to +200 °C for common grades, and up to +260 °C for specialized formulations (see the property table below).

The trade-off: that chain tears more easily under mechanical stress. The chemistry that gives the heat resistance is the same one that limits cut resistance.

Pourquoi rien n'y colle : l'énergie de surface

For a material to adhere to a surface, it has to be able to spread on it — to wet it. Silicone has

very low surface energy

: adhesives, molten films and coatings can't get a grip on it and either bead up or peel off in a sheet.

In service, that shows up as a heat seal that doesn't stick to the roller, a lamination that releases excess adhesive, hot product that picks up cleanly.

The flip side is real:

bonding the silicone itself

— to a core, or in a repair — takes specific primers and surface prep. That's where a sloppy cover shows next to one done by people who know the material.

Corona : excellent diélectrique, à surveiller quand même

The backing roll of a corona station has to be insulating and has to live in the environment the discharge creates. Silicone excels there: excellent dielectric properties and good aging resistance.

But to be straight about it: the cover is still exposed to

electrical stress, localized heat, accidental arcing and mechanical damage

. A surface that loses its dielectric integrity shows up as uneven treatment of the film — sometimes before the defect is visible to the eye.

So a corona roller gets watched — surface condition, durometer — and gets recovered when it loses its integrity. We can set the interval with you based on your running hours.

Les grades : dureté, alimentaire, diélectrique

“Silicone” covers a family of formulations, not a single material. The grades differ in

hardness

— typically on the order of 30 to 80 Shore A for rollers —,

food compliance

dielectric properties

and fine-tuned heat resistance.

A heat sealing roller working irregular surfaces calls for a soft, conforming grade; a laminating nip, a firmer grade that holds the pressure; a food position, a documented FDA grade.

That's why we ask about the position before proposing a grade — and why we keep several grades rather than one do-everything silicone.

Ses fluides ennemis

A paradox shops know well: silicone swells in particular in contact with

silicone oils

— silicone-based release agents and lubricants migrate into the cover, which gains volume and loses its properties.

Some solvents and hydrocarbons attack it too. As with every family, the only reliable answer is a

immersion test

on a sample in your actual products — including your cleaners.

The approach is the same as on our applicator rollers : validate both liquids, the process one and the washdown one.

Remise à neuf, étape par étape

1. Condition survey: durometer at several points, dimensions, runout, surface condition — and a check for swelling or corona erosion.

2. Identification of the existing grade and validation of the selected grade, backed by an immersion test if the chemistry is in play.

3. Stripping of the old cover, inspection of the core, the bearing journals and the journals.

4. Surface preparation and

silicone-specific bonding

— the step that doesn't forgive.

5. Application of the selected grade and vulcanization.

6. Grinding to the target diameter and finish.

7. Final inspection and traceability, FDA documentation included where applicable. Full detail in our roll covering process.

Diagnosis → cause → correction

The symptoms specific to silicone rollers, and what they usually mean.

Symptôme	Cause probable	Correction
La soudure ou l'adhésif commence à coller au rouleau	Surface encrassée, glacée ou érodée — le relâchement se dégrade	Rectification pour retrouver la surface; révision du nettoyage.
Entailles et arrachements en rive	Faiblesse à la coupure du silicone face aux arêtes du produit	Soulagement des rives; vérifier si un autre élastomère convient au poste.
Recouvrement gonflé, mou par plaques	Huile silicone ou solvant incompatible migré dans la matière	Essai d'immersion, changement de grade ou révision des agents en contact.
Surface irrégulière sur un rouleau corona	Érosion lente par la décharge et l'ozone	Rectification ou regarnissage périodique — c'est l'usure normale du poste.
Recouvrement décollé du mandrin	Adhérisation inadaptée au silicone, aggravée par les cycles thermiques	Retrait complet, remise en état du mandrin, adhérisation spécifique refaite.
Marques ou brillance sur le produit scellé	Faux-rond, dureté inadaptée ou température excessive pour le grade	Rectification; révision du grade et du couple température-pression.
Usure rapide généralisée	Poste abrasif ou charge élevée — le silicone n'est pas la bonne matière ici	Réévaluation du matériau : nitrile, EPDM ou polyuréthane selon le poste.

Every wear signature is covered in detail in the roller and wheel diagnostic guide.

Where these rollers are found

Anywhere heat, release or purity defines the position.

Packaging, Film & Extrusion Food, Pharma & Cosmetics Printing Textiles & Nonwovens Wood, Finishing & Coating Corrugated Other Industries

Frequently asked questions — silicone rollers

Why doesn't anything stick to silicone? +

Because its surface has

very low energy

: liquids and molten materials can't spread on it or grab hold of it. A hot adhesive, a heat-sealed film or a wet coating releases cleanly from silicone where it would stay stuck on most other elastomers.

What temperature can a silicone roller take? +

Depending on the grade: many VMQ compounds run from about

−50 °C to +200 °C

for common grades, and specialized formulations go up to

+260 °C

. Few common organic rubbers come close to that range. The exact value is validated grade by grade, for each application.

Is silicone suitable for food contact? +

Yes, with the right grades: formulations that can meet the applicable FDA requirements — in particular

21 CFR 177.2600

— are available, depending on the grade and the operating conditions. Inert, no migrating plasticizers, easy to clean. Compliance is confirmed grade by grade, with documentation to back it.

So why not use silicone everywhere? +

Because mechanically it's one of the weakest elastomers: cut, tear and abrasion well below nitrile and nowhere near polyurethane, high nip loads to avoid, and a higher cost. Silicone is a

specialist

— we choose it when heat, non-stick or purity rule the others out.

Which corona rollers do we cover in silicone? +

The insulating backing roll of the station: excellent dielectric properties and good aging resistance. With one honest caveat — the cover is still exposed to

electrical stress, localized heat, accidental arcing and mechanical damage

. Its condition gets watched, and it gets replaced when it loses its dielectric integrity.

What hardnesses are available? +

Typically on the order of

30 to 80 Shore A

for rollers. Soft and conforming for heat sealing irregular surfaces; firmer to hold the pressure of a laminating nip. Several grades available, including FDA.

Can an existing core be covered in silicone? +

Yes — and that's where the expertise counts: the same low surface energy that makes silicone non-stick also makes it

hard to bond

. Bonding takes specific surface prep and primers, without which the cover debonds under thermal cycling. That's specialist work, not an ordinary casting.

Silicone or polyurethane: which one for a roller? +

They're two opposite specialists.

Silicone

wins on heat, release and food contact;

polyurethane

wins on abrasion, cut and mechanical load. A hot, tacky position calls for silicone; an abrasive, heavily loaded position calls for polyurethane. If your position combines both requirements, that's a real engineering discussion — tell us the actual conditions, the answer is sometimes a third material. See the page polyurethane rollers.

Silicone or EPDM for a hot position? +

It depends on the nature of the heat.

EPDM

excels in

hot water, steam and alkaline washdowns

, with better mechanical strength and a lower cost.