ISO 13485 vs 9001 for RTV Mold Shops

ISO 13485 is a medical-device quality management system. ISO 9001 is a general quality management system. A plaque on the lobby wall is not a capability assessment. It is a starting filter.

For custom silicone *parts* (LSR injection, HCR compression, extrusion), the certificate tells you which record and control habits a registrar accepted. It does not tell you whether the shutoff holds flash. For custom RTV molds on this site, the certificate still does not mill a key or degas a mix. It does not tell you whether last year’s platinum kit is the one on this pour.

Use the standard to decide how deep to audit. Do not use it as a substitute for the audit. A chocolate-tray shop that is honest 9001 is often the right factory. A 13485 LSR cell is the right factory for a device component. Mixing those RFQs is how you pay for theatre — or skip a file you will need.

What each certificate is built to do

ISO 9001 (current issue in most shops is ISO 9001:2015) is a generic QMS: context, leadership, risk-based thinking, documented information, operational control, measurement, improvement. A competent 9001 pour shop can run food, gummy, and industrial jackets with lot traceability that is “enough for the PO.” The registrar did not evaluate your device file.

ISO 13485 (ISO 13485:2016 is the issue most medical buyers meet) is a QMS *for medical devices*. It is built around regulatory expectations: risk management throughout product realization, stricter control of documents and records, validation of processes that cannot be fully verified by inspection (silicone cure is in that neighborhood), work environment, contamination control, traceability, complaint handling, and advisory-notice / vigilance thinking. A silicone *parts* shop that is 13485-certified is claiming it can live inside a medical supply chain, not that every press is an implant cell — and not that every RTV tray is a device.

Neither standard is ISO 10993 (biological evaluation). Neither is ISO 14644-1 (cleanroom class). Neither is FDA 21 CFR 177.2600 or USP Class VI. Buyers who treat “13485” as a material cert will write a bad RFQ. Buyers who treat “9001” as food-contact will also write a bad RFQ.

What 13485 adds that 9001 usually does not

When you compare two factories, 13485 is worth the extra audit days if you need *these* habits, not because the number is larger.

Process validation mindset. LSR cure, post-cure, bonding, and clean packaging are processes where inspection of every part does not prove the chemistry. 13485 expects validation and change control when you touch temperature, time, or the compound. 9001 can do this. 13485 is built to insist on it. An RTV shop that records mix ratio, kit lot, degas, and master revision is doing the analog even under 9001.

Traceability depth. Lot of gum or LSR kit, pigment, primer, mold, press, operator, post-cure oven, packaging lot — or kit lot, mix sheet, master rev, jacket ID, dump lot. Medical buyers need to walk backward from a complaint. Industrial 9001 shops often stop at “compound lot + date.”

Contamination and work environment as QMS objects. Not automatically Class 7. A defined environment, gowning, and control of process aids (release, grease, water) that can become extractables. Tin-cure soap on a platinum bench is a contamination object on this site.

Change control that reaches you. A 9001 shop may swap an equivalent LSR grade — or an “equivalent” platinum RTV — to keep the line running. A 13485 shop should treat a grade, pigment, or post-cure change as a controlled change with customer notification when the contract says so. Put that notification in the RTV quality agreement even if the shop is 9001.

Complaint and nonconformance formality. CAPA that a notified body or FDA inspector would recognize, not a WeChat apology and a free carton.

If your part is a dishwasher gasket with no device filing, you may be paying for theatre. If your article is a chocolate mascot, 13485 is usually theatre. If your part is in a 510(k) or CE device, 9001 alone is a gap you will explain later — on the *parts* OEM.

What neither certificate buys

• A good split or shutoff. Flash is tooling and process. Registrars do not stone lands or seat keys.
• The right silicone. Medical-grade platinum LSR, food-contact RTV, and industrial HCR are purchase and incoming inspection. The QMS only says how those purchases are controlled.
• Cleanroom class. Ask for the ISO 14644-1 classification, occupancy state, and last particle-count report. 13485 can exist in a non-classified hall.
• Biocompatibility. ISO 10993 is on the device and the material file, not on the QMS certificate number.
• Capacity. A 13485 shop with two LSR presses is not a dual-source plan. A 9001 pour shop with one technician is not a seasonal gummy surge plan.

A factory can be 13485 and still be the wrong molder for a 64-cavity infant teat if they have never run a valve-gated cold-runner. A factory can be 9001-only and be the right shop for a 12-cavity gummy tray.

How to audit past the plaque

Request, then sample. Do not tour the showroom and leave.

Certificate scope. The annex must include the processes you need: injection of LSR, compression of HCR, *or* manufacture of RTV molds / vacuum casting. “Trading of rubber products” is not molding and not pouring.

Expiry and registrar. A real accredited registrar, not a weekend mill. Scope address should match the plant you will ship from.

Device-relevant procedures, sampled: incoming LSR/HCR or RTV kits (COA vs spec, platinum vs tin vs peroxide, lot hold), mold PM / recast, process validation summary for a similar part *or* mix-sheet discipline for a similar jacket, change-control log for the last year, complaint file, environmental monitoring if they claim a class.

The bench, not the binder. Watch a setup: mix ratio, vacuum until the foam collapses, lot tickets on kits, first-dump pack — or barrel/mold temps and mix ratio on LSR. 13485 paperwork that does not match the floor is a finding, not a vibe.

Sub-tier. Who cuts the master, who mixes color, who irradiates. 13485 does not forbid subcontracting. It forbids subcontracting you cannot see. Same rule on a 9001 pour shop.

Remote video can check a certificate and a lot ticket. It cannot check whether the “validated” post-cure oven has a broken probe, or whether the vacuum pump on the pour bench holds.

When 9001 is enough, and when it is not

9001 is a rational ceiling for industrial, many food-contact *molds*, consumer, and automotive-adjacent parts *if* you still specify the material standard (FDA 21 CFR 177.2600, LFGB, etc.) and the process controls (first dump / FAI, COA). Add a quality agreement for change notification. You do not need a medical CAPA machine for a coffee-machine gasket or a seasonal soap tray.

13485 is the floor when the silicone is a medical device *component*, when your file will be inspected, or when hospital or notified-body customers will ask. Even then, 13485 is necessary, not sufficient. You still audit cleanroom class, material file, and tool hygiene. That work usually lives at a parts OEM, not on a chocolate-jacket PO.

9001 plus a medical cell is a common honest structure: industrial plant with a segregated, 13485-scoped room. Believe the scope, not the lobby. If the certificate is plant-wide 9001 and “we can do medical,” you are buying a promise.

RUUIPON Mold Structure Decision: QMS does not pick glove vs split. DFM still does. A 13485 plaque will not make a one-piece glove safe for a deep undercut.

Common mix-up: 13485 as a food-mold cert

A lot of RFQs demand 13485 for a gummy tray because someone heard “medical silicone.” In the shop that usually means a parts cell quoting a jacket they will not pour.

What to ask when you're buying

• QMS standard, issue, registrar, scope text, site address?
• Does the scope include RTV mold making — or only LSR/HCR parts?
• Mix-sheet / lot ticket from kit to carton (or drum to carton) on a live job?
• Change-control commitment in the quality agreement?
• Food-contact path (21 CFR 177.2600 / LFGB) named separately from the plaque?

Worked example

You're quoting a 12-cavity pectin gummy tray, platinum RTV, food-contact dumps, ~10,000 / season. 9001 at the pour site, mix sheets, kit COA, 21 CFR 177.2600 / LFGB on the *dump* path if required — not 13485 theatre. If a sister SKU is a 40A LSR valve in a 510(k), that is a 13485 parts OEM with validation summaries. Two POs.

We would not recommend treating 13485 as a material cert

We would not recommend 9001-only as the default for implantable or sterile-barrier components, a trading-office 13485 in front of an unnamed press hall, or skipping the floor watch because the PDF looks gold. We would not demand 13485 for a chocolate tray to “be safe.”

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 | | --- | --- | | RTV mix | Platinum 1:1 or 10:1; tin often 10:1 | | RTV cavity Shore | 10A–20A with a jacket | | Platinum shrink | About 0.1–0.3% | | ISO 3302-1 | M2 common — a drawing class, not a QMS | | Food-contact language | 21 CFR 177.2600 / LFGB on the article — not the plaque | | ISO 14644-1 | Ask class + occupancy; 13485 ≠ cleanroom |

Copy this into a QMS RFQ

• State QMS standard, issue, registrar, scope text, and site address
• ISO 13485 if quoting a medical *component*; ISO 9001 is acceptable for industrial and most RTV mold programs
• Certificate is a filter. Process validation summary *or* mix-sheet discipline and change-control commitment are the quote
• Food-contact and biocompatibility named as separate files

Send the product risk (device vs dump cavity) and the site you will ship from. We'll match 9001 pour discipline or tell you this is a 13485 parts cell. Custom RTV molds.

Related: flashless medical LSR, prototype-to-production overseas, food-grade molds.

FAQ

Does ISO 13485 mean the silicone parts — or molds — are medical grade? No: 13485 is how the factory runs quality. Medical-grade is the compound, the biological evaluation (often ISO 10993 on the device), and the process validation. A 13485 shop can mold industrial HCR — or pour a consumer jacket — on a different bench the same day. Ask for the material spec and the scope, not just the plaque.

Can an ISO 9001 factory mold parts for a medical device? Sometimes, if your regulatory file and the device-maker’s QMS allow it and you add the missing controls by contract: traceability, validation, change notice, complaints. Many device-makers will not accept that risk. Treat 9001-only as an exception you document, not as a default for implantable or sterile-barrier components. 9001 is the usual ceiling for an RTV food mold.

Is ISO 13485 the same as FDA registration or a 510(k)? No: FDA establishment registration, device listing, and 510(k)/PMA are separate U.S. regulatory acts. ISO 13485 is a QMS standard used globally and often aligned with regulatory expectations. A shop can hold 13485 and not be the device manufacturer of record.

What should I ask for besides the PDF certificate? Scope page, site address, last surveillance date, a redacted process-validation summary on a similar silicone part *or* a mix sheet on a similar jacket, incoming material procedure, and a change-control commitment in the quality agreement. Then watch a live lot ticket from kit to carton. Paper without the floor is decoration.

Does IATF 16949 replace ISO 13485 for silicone automotive parts? No: IATF 16949 sits on ISO 9001 for automotive; ISO 13485 is medical. A car-seal program may want IATF, a device seal wants 13485, and some plants hold both. A gummy tray wants none of that theatre. Quote the QMS that matches the product’s regulatory home, not the fancier number.