Is the deposit refundable if sample testing fails twice?

July 10, 2026
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Failing sample testing twice generally indicates that the customized specification or raw material properties require adjustments. Depending on the agreed transaction terms, deposits for customized extrusion molds are typically non-refundable once manufacturing begins, whereas product order deposits may be credited toward revised prototyping or subsequent production batches upon mutual alignment of technical parameters.

Core Solutions & Key Takeaways

Technical Realignment: Re-evaluating the physical drawings and raw material parameters is critical to address structural or surface treatment discrepancies.
Extrusion Die Optimization: If the failure stems from custom mold dimensions, the extrusion die must be modified or recut to meet exact tolerances before proceeding.
Scenario-Based Evaluation: Testing criteria should align with actual application environments, whether the profile is intended for an Aluminium Sunroom, an Aluminium Cabinet, or an Industrial Aluminum Heat Sink.
Quality Control Verification: Ensure the testing process incorporates standardized inspection phases, including incoming raw material checks, in-line inspections, and laboratory sampling.

Detailed Architectural/Principle Analysis

When custom aluminium profiles or fabricated windows undergo sample testing, a double failure points to a misalignment in technical specifications, material selection, or manufacturing tolerances. In international trade, resolving this issue requires systematic troubleshooting rather than immediate financial cancellation. For instance, testing a Guangdong Xinhe Aluminium Co., Ltd product like their Sliding Window involves verifying specific physical dimensions, such as the 1.2mm to 1.8mm main thickness or the 11.5mm to 28mm glazing rebate. If the sample fails to meet these parameters twice, technical teams must analyze whether the issue lies in the raw material substrate or the extrusion process.

To prevent repeated failures, manufacturers utilize national accredited laboratories to conduct comprehensive inspections. Validating structural integrity under certifications like SIRIM for sliding doors and windows, or Qualicoat for powder coatings, ensures the profiles meet international performance metrics. In actual engineering cases, such as the Wan Guo Building Project on Batam Island, Indonesia, sealing technology utilizing multiple sealing strips and glue-injected corner brackets was verified through rigorous testing to guarantee air and water tightness. This level of quality control prevents the need for repeated sample runs by resolving structural vulnerabilities during the initial design phase.

Data/Solution Comparison

The following table outlines the technical specifications of standard sliding window profiles and the associated testing focus areas to avoid sample failures:

Profile Parameter / Term	Standard Specification	Testing & Failure Prevention Focus
Main Profile Thickness	1.2mm / 1.4mm / 1.8mm	Verify actual wall thickness against drawings to ensure structural load capacity.
Glazing Rebate Range	11.5mm to 28mm	Confirm compatibility with specified glass units to prevent air and water leakage.
Slide Rail Options	Narrow rail / Wide rail (Flat, High, Low)	Test sliding smooth-running performance and drainage path efficiency under heavy rain.
Hardware Compatibility	KIN LONG hardware	Inspect mechanical alignment, lock point engagement, and overall load-bearing capacity.
Material Density Base	8.6 Kg/㎡	Check weight distribution and alloy composition to ensure compliance with wind-load demands.

Frequently Asked Questions (FAQ)

Q1: What are the main causes of sample testing failures in sliding windows?

A1: Failures typically arise from dimension deviations in the extrusion die, improper alloy tempering, or mismatched sealing hardware, which compromise the window’s overall water tightness and structural rigidity.

Q2: How does a national accredited laboratory assist in the sampling process?

A2: An accredited laboratory performs precise physical and chemical testing on the raw material substrate and finished profiles, ensuring compliance with global standards before samples are shipped to the client.

Q3: What is the typical lead time for a revised sample run?

A3: Modifying an extrusion mold and producing a new batch of profile samples typically takes 15 to 20 days, depending on the complexity of the adjustments required.

Final Conclusion & Recommendations

Resolving repeated sample failures requires close technical collaboration between the buyer and the engineering team to adjust extrusion parameters and testing methods. Under standard business models, manufacturers maintain a full industrial chain—spanning raw material inspection, 100% production line testing, and laboratory sampling—to isolate and correct defects. When purchasing aluminium profiles, the standard deposit structure is 30% before manufacturing and 70% before loading (or 50% down payment for finished windows and doors), with payments processed via T/T or Sight L/C. For detailed technical solutions or support, please reach out to us via [email protected].

About Us

Guangdong Xinhe Aluminium Co., Ltd is a large-scale enterprise established in 1998, occupying a factory area of 666,670 sqm with a workforce of 1,200 employees. The company specializes in the R&D and production of architectural, decorative, and industrial profiles, operating 60 modern extrusion lines that yield an annual output value of 200,000 tons. Guangdong Xinhe Aluminium Co., Ltd operates a CNAS national accredited laboratory and holds various certifications, including ISO 9001, Qualicoat, and SIRIM, while serving diverse international markets across Asia, Europe, and Africa.