Ford FLTM BI 105-04 Automotive Component Immersion Testing
FLTM BI 104-04 Immersion Testing is a Ford laboratory method used to evaluate coating adhesion before and after warm water immersion.
Summary Of FLTM BI 104-04 Immersion Testing
FLTM BI 104-04 is applied to electrocoated and topcoated films on phosphated steel panels where water exposure can reveal adhesion weaknesses that are not visible in initial inspection.
Most pass/fail outcomes focus on coating changes that indicate loss of adhesion or durability after immersion. Common failure signals include blistering, delamination, or adhesion loss that exceeds the acceptance criteria defined by a Ford material specification, drawing note, or supplier control plan.
A deviation typically means the test ran as planned, but the result falls into a gray area such as a borderline adhesion rating, localized defects tied to an edge condition, or a configuration detail that was not fully aligned to production intent. Retesting is usually tied to corrective actions and tighter configuration control so the follow up run answers a specific question rather than repeating the same uncertainty.
Because this method is often used in the Ford supply chain, documentation matters as much as immersion time. Test records need to show sample configuration, immersion conditions, adhesion evaluation approach, and clear traceability so results hold up during supplier reviews and program audits.
When FLTM BI 104-04 Immersion Testing Is Required
This testing is commonly triggered by coating system qualification, new supplier onboarding, or a material change that affects pretreatment chemistry, electrocoat parameters, or topcoat cure conditions. It is also used when field performance concerns point to water driven coating lift, edge creep, or appearance degradation that suggests a loss of adhesion reserve.
Severity and relevance depend on how the coated part sees water exposure in service. Component geometry that traps water, interfaces that retain moisture, and edge conditions that stress film build can all drive a more aggressive evaluation plan, even when the base material and coating stack look unchanged on paper.
Teams typically align the test to the decision being made. Qualification supports initial approval, verification supports a controlled change, validation supports performance confidence in representative conditions, and production monitoring supports ongoing process control. “Worst case” usually means production intent panels, representative substrate preparation, and the coating condition that is most likely to expose adhesion weakness after immersion.
The Importance Of FLTM BI 104-04 Immersion Testing
FLTM BI 104-04 Immersion Testing exists because water exposure is a reliable trigger for coating adhesion loss in real automotive environments. Immersion can drive swelling, plasticization, and interfacial weakening, especially when surface preparation or cure is marginal. The method provides a structured way to compare coating systems and to confirm that a process window still produces acceptable adhesion after controlled water exposure.
For engineering teams, the value is practical decision support. This method helps separate cosmetic surface issues from true adhesion risk, and it creates an evidence trail when coating changes are proposed to reduce cost, improve throughput, or address environmental compliance constraints. For program leadership, it reduces the risk of late rework by identifying adhesion concerns while changes are still manageable at the coating line or supplier process level.
It also improves supplier alignment because it turns coating performance discussions into measurable outcomes tied to a Ford method. When both parties work from the same acceptance criteria and the same exposure approach, root cause work becomes faster, and corrective actions can be verified with less debate about what the results mean.
Documentation quality is critical because many outcomes are judged through visual and adhesion assessments that require context. Reports should connect the observed condition to immersion duration, water control, specimen orientation, and evaluation timing. When that traceability is missing, the same panel can appear to “pass” or “fail” depending on who reviews it and what assumptions they apply.
Common Risks Reduced By FLTM BI 104-04 Immersion Testing
One risk category is early adhesion loss that shows up as blistering, local lift, or delamination after immersion. These issues often trace back to pretreatment inconsistency, contamination, incomplete cure, or insufficient film build at edges and corners where coating coverage is harder to control.
A second category is durability loss that is not immediately catastrophic but still drives long term quality concerns. Immersion can reveal sensitivity to water uptake that later becomes corrosion protection loss, staining, or downstream adhesion failures when the coating sees additional stressors such as humidity cycling or salt exposure.
How FLTM BI 104-04 Immersion Testing Data Supports Pass/Fail Decisions
The most useful data connects immersion conditions to a repeatable adhesion evaluation before and after exposure. That usually means clear records of specimen identification, coating stack description, immersion controls, and how adhesion was assessed so results can be compared across lots, suppliers, or process changes.
Pass/fail decisions depend on acceptance criteria first, then on documented engineering judgement when criteria allow graded outcomes. When results are close to a threshold, confidence comes from repeatability, consistent evaluation timing, and evidence that instruments and environmental controls were in tolerance during the run. A strong report also notes how failures were handled at a high level, including root cause observations and the corrective action path that drives retest planning.
Scope Of FLTM BI 104-04 Immersion Testing Compliance Testing
Pretest Planning, Sample Selection, And Incoming Evaluation
Pretest planning starts by locking down production intent details that influence adhesion. That includes substrate and pretreatment definition, coating stack description, cure condition, and any process identifiers needed to trace panels back to a specific line window. When panels represent a component finish, the plan should also document geometry features that may drive edge sensitivity so panel selection does not hide risk.
Incoming evaluation should capture labeling, photographs, and baseline condition checks that make post immersion changes easy to confirm. Baseline adhesion evaluation timing should be documented, along with any handling controls that prevent contamination before immersion. Configuration control needs to be explicit because small differences in cleaning, masking, or coating age can shift water response enough to change conclusions.
Test Execution, Monitoring, And Quality Controls
This method evaluates adhesion before and after warm water immersion, using controlled exposure conditions to create repeatable stress on the coating interface. The immersion portion commonly uses deionized water at a controlled temperature with defined duration, since water chemistry and temperature stability can strongly influence coating response and reproducibility.
Execution quality depends on how specimens are prepared and positioned. Orientation should prevent unintended shielding, pooling, or contact points that create localized damage unrelated to the immersion exposure itself. Controls should also prevent panels from touching, and they should avoid flow conditions that create uneven exposure. Monitoring should record immersion temperature control, water condition management, exposure time, and any interruptions so the final report shows that the planned stress was delivered.
Post immersion handling and timing are equally important because coatings can change rapidly as they cool and dry. A disciplined process documents when panels were removed, when evaluations were performed, and whether any conditioning steps were required by the requirement source. Adhesion evaluation should be applied consistently before and after immersion so shifts can be interpreted as true performance change instead of method variation.
Data Reduction, Analysis, And Result Validation
Most results are derived from documented observations and adhesion evaluation outcomes rather than complex calculations. Raw observations become reportable results when they are organized by sample, exposure condition, and evaluation time, with photographs that clearly show defect type and extent. If adhesion is rated on a scale or by a defined method, the report should present both the rating and the observation context that supports it.
Result validation relies on repeatability checks, cross checks between evaluators when subjective ratings are used, and confirmation that immersion controls remained in tolerance throughout the exposure. When an unexpected failure occurs, a good validation approach ties the observation back to likely drivers such as coating defects, panel handling, or process drift, then defines whether retest is needed and what configuration change is being verified.
Documentation And Reporting Requirements
Reports should capture test conditions, equipment used for immersion control, calibration status where applicable, sample configuration, and a clear timeline of pre immersion and post immersion evaluations. Photographs should include baseline and post exposure condition, with identifiers that link images to the specific panel and test run.
Reporting should also show the requirement source that defines acceptance criteria, including revision control, and it should state pass/fail conclusions in the same structure as the criteria. Compliance packages often require traceability to sample identifiers, controlled record keeping for any deviations, and approvals consistent with laboratory quality systems used for customer facing validation work.
Related EMC And Electrical Test Services
Immersion driven coating and finish concerns often connect to broader environmental exposure planning for automotive programs. When corrosion resistance is part of the durability target, pairing immersion work with FLTM BI 103-01 Corrosion Salt Spray Testing or ASTM B117 Corrosion Salt Spray Testing can help show how a coating system performs when water exposure and chloride exposure create combined risk.
For programs that also need non coating immersion evaluation, FLTM BI 104-01 Immersion Testing and the broader Fluid & Chemical Immersion capability can support materials that face coolant, washer fluid, or other service liquids. In cases where a coated electronic enclosure is part of the assembly, EMC validation work such as ISO 7637-2 Conducted Immunity On Power Lines Supply Voltage Transients can be scoped alongside environmental exposure so functional performance is confirmed after water driven stress.
Frequently Asked Questions About FLTM BI 104-04 Immersion Testing
What Materials And Coatings Does This Method Focus On?
It is commonly used for electrocoated and topcoated films evaluated on phosphated steel panels, with adhesion assessed before and after warm water immersion.
What Are The Most Common Failure Signs?
Typical failure signs include blistering, delamination, and measurable adhesion loss after immersion, as defined by the acceptance criteria for the program.
How Long Does Testing Usually Take?
Total duration depends on the required immersion exposure time and the number of evaluation checkpoints. Scheduling also includes baseline evaluation, controlled immersion time, and post immersion evaluation timing.
What Drives Retest Decisions?
Retest is commonly triggered by a confirmed failure, an identified process change, or uncertainty in sample configuration control that could have influenced adhesion performance.
What Documentation Do Customers Usually Expect?
Customers typically expect traceability to panels, clear immersion condition records, evidence of evaluation timing, photos, and a pass/fail conclusion tied to a stated requirement source.
Expert Laboratory Testing For FLTM BI 104-04 Immersion Testing
Reliable Analysis supports Ford method work with process control that keeps immersion exposure, evaluation timing, and reporting consistent across programs. Testing support is built around configuration discipline, clear documentation, and results that make supplier discussions and engineering decisions easier to close.
Reliable Analysis can also help define how this method fits into a broader durability plan, including related immersion and corrosion exposures that better match the expected service environment for the coated system. Request a quote to start FLTM BI 104-04 Immersion Testing so you can confirm performance against Ford requirements, and include related immersion and corrosion services in the same program when broader durability evidence is needed.
