What is the threshold for silicone parts entering car factories: IATF 16949 and PPAP

The automotive industry is a large market for silicone seals, shock absorbers, and pipeline components, and is also the most demanding manufacturing customer. For factories that are used to producing industrial and consumer parts, the first time they come into contact with a car factory or Tier 1 (first tier supplier) order, they will hit two walls: IATF 16949 system certification and PPAP submission. This article explains these two things clearly.

What is IATF 16949

The quality management system standard for the automotive industry is released by the International Automotive Task Force (IATF), based on ISO 9001 but with much stricter requirements. It manages the entire quality operation mode of the factory: design and development process, supplier management, production process control, traceability, corrective action.

The core difference between ISO 9001 and ISO 9001:

The process method is stricter - each process parameter must have a corresponding control plan and operation manual, and "experienced craftsmen" are not recognized; Traceability requirement - the entire process from raw material batch to finished product batch can be traced, and any quality problems can be located to specific batches and mold cavities; PPAP and APQP - Product development and mass production handover have fixed stages and deliverables (as discussed below); Customer Specific Requirements (CSR) - Each car manufacturer adds their own requirements beyond IATF, such as additional evaluations from General Motors and Ford.

The certification cycle starts from one year (system establishment+trial operation+audit), with a cost of several hundred thousand yuan. Without this certificate, car manufacturers and mainstream Tier 1 tenders do not even have the qualification to be shortlisted - it is the ticket to this market.

APQP and PPAP

APQP (Advanced Product Quality Planning): A phased framework for product development, consisting of five stages from project initiation, design, trial production to mass production handover, with defined outputs for each stage. The car factory project follows this pace, and if the nodes do not match the project, it will stagnate.

PPAP (Production Part Approval Procedure): The overall submission package before mass production, which proves to the customer that "I am ready to produce this part in bulk and stably". A complete PPAP typically includes 18 items:

Design records, engineering change documents, DFMEA/PFMEA (Failure Mode Analysis), process flow diagrams, dimensional results, material/performance test results, Process Capability Study (CPK), MSA (Measurement System Analysis), control plans, part submission guarantees, etc.

Customers review by level (Level 1 to Level 5, with higher levels requiring more complete submissions), and only allow mass production and shipment after approval. Key point: After PPAP submission, any changes - such as changing material suppliers, changing process parameters, moving production lines, or changing mold components - must be notified to the customer to resubmit the change confirmation. Unauthorized changes are a major taboo in the automotive supply chain, and fines and expulsion may be imposed.

Process capability CPK: Car manufacturers generally require CPK ≥ 1.33 for critical dimensions (with sufficiently small and centered size fluctuations during mass production). This requirement forces the precision and process stability of the mold, and many factories get stuck here when they first do CPK.

The actual path for silicone component manufacturers to make automotive orders

It's not like getting a certificate in one go that leads to orders. Common path:

Start with non safety components such as decorative strips, floor mats, and non critical shock absorbers. Customer requirements are relatively low, and accumulate system operation records;

Entering through Tier 2/3- supplying semi-finished products or accessories to Tier 1, with a requirement one level lower than directly supplying to the car factory;

Gradually upgrade to functional components - seals, pipeline components, requiring full system capability.

How to calculate input-output ratio

IATF certification+system operation+PPAP capacity building, with a total investment of millions for a medium-sized silicone factory. Whether it's worth it or not depends on the target: to purchase millions of car customers annually, and to invest in certification to recoup costs within two to three years; I just want to occasionally take on a car order, this investment is not worth it at all.

Reminder to the purchaser

To evaluate the ability of silicone component suppliers to do automotive projects, don't just look at certificates (certificates can be attached and subject to audit), look at three practical abilities: whether they have run PPAP (need a desensitized PPAP sample to check structural integrity), whether they have CPK data management (whether there is process capability statistics on site), and how change management is implemented (ask for an actual change case). If these three questions are answered well, the system is really running; If you can't answer well, the certificate is just paper on the wall.

The high threshold of the automotive industry is a two-way street: it blocks factories from joining in the fun, while also allowing factories that can enter to obtain stable orders that are not available elsewhere. This investment decision is essentially a decision on whether or not to choose this track.