How to Switch Contract Manufacturers Without Disrupting Production

When you switch contract manufacturers, everything moves with you: documents, tooling, materials and suppliers, process know-how, quality and compliance records, and open purchase orders. Miss any one of them, and production can stop.

A smooth switch finishes open orders with the current manufacturer, fully documents the product, retests it at the new source with fresh samples, and builds in backup supply so production doesn’t hinge on one handover date.

This guide assumes the current manufacturer keeps producing while the new one qualifies, since that overlap keeps production going. If the current manufacturer cannot keep producing, buffer stock and early retrieval of tooling and materials carry more weight. 

Carolina CoverTech is a contract manufacturer specializing in RF welding, heat sealing, and industrial sewing, and the sections below follow the four steps we use for our own work.

A buyer’s agreements with its own customers can attach conditions to a change of manufacturing source. Find them before the first conversation with a new manufacturer, because they determine what proof the new source must provide.

Typical requirements include a first article inspection, often under AS9102 in aerospace and defense, whenever a change in where or how the part is made could affect its fit, form, or function. Many customers also want advance notice before the change begins. Engine and automotive customers often require a production part approval submission, and most bar shipments from the new source until they sign off.

These requirements apply only where a contract invokes them, and a buyer’s own purchase orders, quality agreements, and customer specifications show which ones apply to its products. Buyers certified to ISO 9001 also fall under clause 8.4, which covers externally provided processes, products, and services and requires verification that they meet requirements.

The agreement with the current manufacturer sets the exit terms, such as what happens to open orders and tooling, so review it before sending notice. Its exclusivity and confidentiality clauses may also require you to tell the current manufacturer before you evaluate a new one. Your counsel can confirm what applies.

Tooling ownership generally follows who paid for it. If the OEM funds the tooling, the OEM owns it. If the manufacturer funds it, the manufacturer often keeps it, and the contract should say whether it’s returned, bought out, or scrapped when the relationship ends.

Good practice:

• Put ownership in writing before paying for any tooling.
• Attach an inventory with serial numbers, specs, photos, and location.
• Permanently mark each tool with the owner’s name and an asset number.
• Include return and inspection rights in the agreement.
• Have counsel review the language, since terms vary by state and country.

For a fabricated fabric product, a tooling list can include patterns, dies, and fixtures where they exist, such as RF welding dies, and each item on the list is recorded as owned by the buyer or by the manufacturer.

We work from drawings, CAD files, or physical samples, so we can still start with a sample if drawings aren't complete. The more of the following a buyer has on hand, the less the new manufacturer has to guess. We also have a guide to what a contract manufacturer needs in an RFQ that covers the same ground.

• Drawings, CAD files, or physical samples, with each dimension labeled as equipment size, inside fit, outside fit, flat pattern, or inflated size, and with the tight-tolerance dimensions identified.
• The bill of materials, including fabric and hardware specifications and any approved alternates.
• Performance requirements with test methods, since “must not leak” is not a usable acceptance standard without one.
• How the product is fabricated today, including the seam method and the way hardware or attachment points are installed.
• The current revision of every drawing and specification, so the outgoing and incoming manufacturers work to the same revision.
• Packaging, labeling, and delivery requirements.
• Any compliance requirement, stated at the start, including a Berry Amendment requirement.

A transfer package is stronger with good and not-good samples, a list of past product problems, a process control plan with work instructions, and recorded video of any special or complex operation. Having an engineer from the new manufacturer sit in on a customer audit at the current one is another way to capture practices that were never written down. The incoming manufacturer can also sign a nondisclosure agreement before the customer shares documents.

The second step is a proof of concept or prototype. For a switch, the existing product serves as the reference. We build a physical sample first. Repeat products may get a fit sample built from proven specifications, and first-of-its-kind designs get a cut sample made with the same seam methods as the final product, as described in our custom fabrication process. It is best to plan for at least one or two sample rounds, with new samples, fit confirmation, and construction validation at each.

A first article inspection formally verifies that a new source can build the product to all engineering requirements with a stable, repeatable process. A complete report includes measured results for each characteristic and a record of every discrepancy and how it was resolved. It also needs material certifications that cite the drawing’s material or process specification, plus certifications for any special processes. A generic certificate of conformance often isn’t accepted for the material certifications. 

Write the acceptance criteria before the first sample is built and put your quality standards in the agreement. Once a sample is approved, turn it into an inspection checklist. For a fabricated product, the criteria can draw on the dimensions and test results named in the transfer package, including seam and weld performance. Pilot run size depends on the product and your requirements, since no single published figure applies across products.

After sample approval, we set up a manufacturing process to meet lead time and quality expectations, then begin production. Our production checks on every order include verifying dimensions against the approved prototype, inspecting seams for consistent welds or stitching, and testing hardware or attachment points for fit. Documenting the same checks before production starts helps keep standards consistent when the manufacturer changes.

No single timeline applies to every product. Straightforward new orders with us take three to six weeks from a signed drawing to delivery, and regulatory testing, such as third-party fire-retardancy verification, can extend that.

Materials and Sourcing

A new manufacturer may buy materials from different suppliers than the outgoing one, which can change the product. A material change typically triggers first article inspection and production part approval, so a change in a material's source can trigger requalification where a contract requires it.

Having the new manufacturer buy long-lead-time parts the old one already purchased, with payment after inspection, is one way to bridge gaps. Agree on a bill of materials with approved alternates before the first build and evaluate stock from the outgoing manufacturer as a bridge for material gaps. Mid-production material changes commonly cause delays because they reset the clock for that part of the order.

Running Both Manufacturers During the Handover

An overlap period, with both manufacturers producing, keeps supply for the buyer while the new manufacturer ramps up. Orders already committed finish at the current manufacturer, and redundancy is built in so production doesn't depend on a single factory. Where a customer requires approval of a source change, shipments from the new source wait for the signed approval, so the outgoing manufacturer’s output covers demand until then. Buffer stock built or transferred during the overlap adds a margin.

The overlap length depends on the product, volumes, and how quickly the new manufacturer’s first articles are approved, and no published figure applies across products. Intellectual property, confidentiality, and who may produce what during the overlap are contract questions, and counsel can confirm the terms before both manufacturers are working at once.

Working toward a supplier transition date? Contact our team with your product and delivery requirements to discuss sampling, material availability, and a realistic production schedule.

Compliance Records That Move With the Product

Products made under the Berry Amendment carry documentation that traces each material and component source, so a change of manufacturer affects that paperwork. The amendment requires certain items to be 100% domestic, with the entire production process in the United States, including raw material sourcing, component manufacturing, and final assembly, a stricter standard than the Buy American Act.

Compliance is not self-certifying. Contracting agencies can request documentation at contract award, during performance, or in a post-award audit; it includes mill certifications for base fabrics, fibers, and yarns, supplier attestations from each component manufacturer, records of thread, hardware, and coating sources, and a signed compliance certification. Requirements flow down to subcontractors, and the prime contractor is responsible for supplier noncompliance, so the replacement set includes sourcing records from a new manufacturer. When a project requires Berry compliance, we source U.S.-produced textiles, hardware, and thread, complete all production at our North Augusta, South Carolina facility, and keep full supply chain documentation for the project.

step 4: Shipping and Closing Out the Old Source

The final step is packing the order to specifications and palletizing it for delivery to the desired location. The packaging, labeling, and delivery requirements in the transfer package let the first shipments from the new source match what the buyer’s receiving team and customers expect.

The way an exit is handled affects the handover. Business continues as usual while options develop, communication with the outgoing manufacturer stays formal and professional, and management approves a contingency plan before notice is given. The contract terms reviewed in discovery set what the outgoing manufacturer owes and when, and the outgoing manufacturer can certify the return or destruction of the buyer’s materials within a defined period. A record of emails, meeting notes, and contract amendments, together with the tooling inventory and the certified return or destruction, documents the exit.

Starting a Switch With Carolina CoverTech

At Carolina CoverTech, we focus on flexible material fabrication, which we have done for decades, and we do not make injection-molded plastic parts, metal components, electronics, or rigid goods. Fabric, film, coated textiles, and laminates are the best fit, especially when you need airtight, watertight, or high-strength seams and bonds, U.S. manufacturing, Berry-compliant sourcing, or a documented supply chain. We have built thousands of products like these, and a buyer with a custom spec, or only a sample to work from, can get help writing the spec as part of the move.

Our contact form includes an option for manufacturing an existing product, and we use a New Product Form to collect project details. For well-defined projects, we can often move from initial review to production within a week, and when information is missing, our first quote may be a budgetary estimate with stated assumptions. If the product fits, the next step is a conversation, and you can submit requests through our contact page, by email at info@carolinacovertech.com, or by phone at 800-763-0243.