FAQs

Frequently Asked Question

Here you can find answers to various common questions covering design, orders, production, payment, after-sales service and more.

Can you help us with the design?

Yes, we provide free design services with unlimited revisions until you are fully satisfied.

How many days for sample and production?

Sample lead time: 7-15 days; bulk order: 15-30 days, subject to order quantity.

What payment methods do you accept?

We accept T/T, Paypal/Western Union, LC…

Standard Warranty Policy

Standard Full Warranty Policy Below

Shipping Way

Samll amount by courier, big amount shipping by Air/by Sea.

Products Tapes

Silicon Steel Core, EI laminatioin, Amorphous Core, Nanocrystalline Core

Five-star Service

Free supply of certificate of origin, test reports and certification documents; assist with customs inspection.

Pick one of FAQ styles

Display FAQ accordions

  1. Warranty Term: 12 months after goods arrival at destination port, or 18 months ex-factory, whichever comes first. Extended 18–24 months for long-term bulk clients.
  2. Warranty Coverage: Free re-production & shipping cost covered for factory defects: wrong grade, excessive core loss, out-of-tolerance dimension, coating peeling, poor bonding. Full set of test certificates provided for free.
  3. Exclusions: Damage from customer secondary cutting/stamping, improper storage, overload operation, unauthorized structural modification, late damage claim without photos.
  4. Claim Process: Reply within 24–48 hours after receiving order No., batch info & defect pictures. Third-party lab testing available for mass quality disputes.
  5. Free Technical Support: Unlimited free sample design, online assembly guidance, troubleshooting before & after warranty period.
  1. Damage caused by customer secondary processing: self-cutting, stamping, polishing, annealing or structural modification.
  2. Issues arising from improper operating environment: rust due to damp storage, operation beyond designed temperature limits, overload, or core burnout caused by abnormal power grid.
  3. Man-made / physical damage: failure to provide photos as evidence within 3 days after goods arrival, collision damage, unauthorized disassembly of cores, or altered coil assembly methods.
  4. Drawing revision losses: Buyer shall bear all scrap losses incurred by later changes to dimensions, thickness or lamination stack thickness after both parties confirm the drawings.
  5. Normal wear and tear: Natural aging of cores after long-term operation under load is not deemed a quality defect.
  1. Finished processed cores (C-type, EI, laminated, resin-bonded laminated stacks): 12 months. Two calculation options shall be stated in the contract, either one applies:
    • Option 1: 12 months starting from the date goods arrive at destination port (most common for foreign trade)
    • Option 2: 18 months from shipment date, whichever expires earlier
  2. For key long-term bulk power clients: Warranty can be negotiated and extended to 18–24 months
  3. Bare silicon steel coils/strips: 12-month warranty; complete cores for large power transformers carry up to a 3-year warranty
  1. Material defects: Mismatched silicon steel grade, unqualified core loss/permeability, inconsistent performance between batches
  2. Processing defects: Dimensions out of drawing tolerance, excessive lamination burrs, peeling insulation coating, delamination, cracked resin bonding
  3. Undetected factory defects: Missing parts, deformation, rust spots formed before delivery
  4. Supporting documents: Free reissue of Material Test Certificates (MTC), electromagnetic test reports, RoHS and UL customs certificates
  5. Remedy solutions: Defective products will be remanufactured and reshipped free of charge with all round shipping fees covered by manufacturer; partial order discount compensation is negotiable for minor flaws
  1. Response time: A resolution judgment will be issued within 24–48 hours upon receipt of customer’s claim including order number, batch number, defect photos or test reports; English technical support available
  2. Verification procedure: Minor issues resolved via online technical troubleshooting; third-party laboratory retesting (e.g. SGS) is available to confirm liability for mass performance disputes
  3. Shipping damage compensation: Manufacturer will resupply goods if complete unboxing damage photos are submitted within 3 days after arrival; claims without timely evidence shall be borne by buyer
  4. Return & exchange rules: Cut and processed finished cores are non-refundable and non-exchangeable unless factory defects exist; uncut full silicon steel coils are negotiable for return
  1. Pre-sales: Free magnetic performance selection, drawing verification, unlimited free sample production
  2. In-production: Full-process technical guidance including online training for lamination, potting and insulation treatment
  3. Permanent remote technical support (in & out of warranty): Troubleshooting high magnetic leakage, excessive temperature rise, abnormal no-load loss and other failures
  4. Benefits for long-term clients: Priority production scheduling, emergency stock core resupply, free updated matching new material grade solutions
  1. Custom non-standard cores: No unconditional return or exchange after production once drawings are signed and confirmed by both parties
  2. Customs clearance support: Free provision of certificate of origin, test reports and certification documents, assistance with customs inspection
  3. Out-of-warranty service: Only raw material cost charged; free process technical guidance provided