I. Prerequisite for Returns/Exchanges: Prioritizing Inspection
The success of an adhesive return or exchange often hinges on the inspection process. Upon receipt, conduct a four-point check within the contractually stipulated inspection period (usually 7 to 15 days): Quantity Check—verify actual receipts against orders and packing lists (number of drums/tubes) and document any shortages or omissions on the spot;
Batch Check—verify batch numbers against the COA (Certificate of Analysis) and compare viscosity and cure time data with TDS (Technical Data Sheet) parameters; Quality Check—perform spot checks after opening (viscosity feel, appearance for gelation/separation, packaging leaks) and conduct cure tests (verify if the mixing ratio and cure time are normal); Shelf Life Check—verify the production date against the shelf life (typically 6 to 24 months) and reject or negotiate a price reduction for products nearing expiration. Notify the supplier in writing (email/letter accompanied by photos and test data) regarding any issues found during the inspection period;
failure to raise objections within this period implies acceptance. Issues such as batch drift and curing problems can be detected by opening and testing samples during the inspection phase—don’t wait until the product is on the production line to get into a dispute.
II.
Common Types of Quality Issues and Evidence Requirements
The type of quality issue determines the resolution method.
Batch Drift Issues: Viscosity fluctuations (affecting dispensing volume) and changes in cure time (affecting production line cycle times)—substantiate claims by comparing COA data with TDS specifications; if batch data is abnormal, the entire batch should be exchanged or returned.
Curing Anomalies: Incomplete curing (insufficient strength) or failure to cure (due to mixing ratio or raw material issues)—substantiate claims with cure test videos and strength test data; the entire batch should be returned.
Packaging/Leakage Issues: Drum lid leaks, damaged containers—provide proof via unboxing photos and records of the leakage volume; replacement or exchange provided.
Shelf Life Issues: Delivery of products nearing expiration or already expired—provide proof via photos of the manufacture date; exchange of the entire batch.
Performance Issues: Insufficient bond strength (failure to meet shear/peel standards)—provide proof via test records based on actual operating conditions; exchange or return.
Composition Issues: Formula mismatch with the Technical Data Sheet (TDS) or abnormalities in odor/color—submit samples for composition analysis.
Key Evidence Requirements: Unboxing photos (with timestamps), test data (viscometer readings, cure time records), retention of the defective items (do not discard), and a formal written notice—the more standardized the evidence, the smoother the return or exchange process.
III.
Testing and Arbitration: Adjudicating Viscosity and Strength
Disputes regarding viscosity and strength are resolved through third-party testing and arbitration.
Applicable scenarios: Supplier claims a viscosity of 8,000 mPa·s, but actual measurements show significant deviation which the supplier disputes; disputes over cured strength (e.g., bond failure incidents);
disputes regarding composition and formulation. Testing Agencies: International third parties such as SGS, Intertek, or TÜV, or the National Quality Supervision and Inspection Center for Adhesives (a domestic authority)—testing is conducted according to relevant standards (e.g., GB/T 2794 for adhesive viscosity, GB/T 7124 for shear strength).
Process: Mutual agreement on the testing agency → Sample submission (sealed sample + retained sample from the same batch) → Testing (7–30 day turnaround) → Report issuance → Liability determination based on results.
Cost Allocation: Most contracts stipulate that the party raising the claim advances the fees, while the losing party bears the final cost.
Note: Ensure sample representativeness before testing (randomly selected from the batch); test reports serve as hard evidence for arbitration and litigation—the laboratory, not verbal claims, provides the final verdict on viscosity and strength.
IV.
Standards for Returns, Exchanges, and Compensation
Returns, exchanges, and compensation are handled based on the severity classification of the issue.
Minor issues (cosmetic defects, damaged packaging): Exchange or price discount (3%–10% of product value).
Batch deviation (viscosity/curing time outside TDS specifications): Deemed non-conforming—exchange for a conforming batch plus compensation for losses due to production downtime.
Curing anomalies (failure to cure, insufficient strength): Return of the entire batch; supplier bears shipping and testing costs—bonding failure may lead to product scrapping, with compensation determined by contractual liability clauses.
Packaging leakage: Replacement shipment; supplier bears shipping costs.
Near-expiry/expired products: Exchange of the entire batch.
Non-compliant composition: Return of the entire batch plus compliance liability (if export certification is affected, the supplier bears losses related to customs clearance).
Liability compensation: Losses caused by adhesive quality defects (e.g., product scrapping due to bonding failure, production line stoppage due to batch issues) are settled according to contractual liability clauses and product liability insurance.
Including compensation standards in the contract forms the basis of negotiations—verbal promises of “guaranteed exchange” from generic-brand suppliers must be documented in writing during contract signing.
V.
Practical Steps for the Return and Exchange Process
Follow these eight practical steps when quality issues arise.
Halt and quarantine: Immediately stop using the suspected batch (continuing to use non-curing adhesive will only result in mass product scrapping) and quarantine samples.
Written notification: Send written notice (email and formal letter) within three working days, attaching photos, test data, and detailed information.
Negotiate a solution: Agree with the supplier on the course of action—exchange, return, or third-party testing/arbitration.
Testing and arbitration: Submit to third-party testing if no agreement is reached.
Execute return/exchange: Carry out the agreed plan—exchange (with acceptance inspection of the new batch) or refund (verify receipt of funds).
Documentation: Archive notices, test reports, and correspondence records (for auditing and accountability purposes).
Supplier review: Factor quality complaints into supplier performance evaluations; reduce order share or phase out suppliers with recurring issues.
Export batches: If a problematic batch involves the destination port, notify the freight forwarder to hold the shipment and inform the customer; handle return shipping or claims in accordance with the contract.
The core principle for adhesive returns and exchanges is “quality first”: regarding batches showing drift or curing anomalies, it is better to return them than to let them enter the production line and result in mass scrapping.
Conclusion
How should quality issues with industrial adhesives be handled regarding returns and exchanges?
The process involves prioritizing acceptance checks (a “four-point check” within 7–15 days covering quantity, batch COA, curing tests, and shelf life), adhering to standardized evidence submission (photos, test data, and retained samples), submitting disputes to third-party testing for arbitration, implementing tiered compensation based on the severity of the issue, and contractually defining acceptance periods and liability caps.
By standardizing the handling of adhesive returns and exchanges, the bottom line regarding batch consistency and curing quality is safeguarded.
