Used HMDS Vapor Prime Oven: Buyer Acceptance Guide
Buying a used HMDS vapor prime oven? Check wafer handling, process logs, utilities and adhesion results before agreeing to acceptance terms.
For a used HMDS vapor prime oven, build the purchase around your wafer process and a witnessed acceptance plan. Request documented configuration and measured results before negotiating final terms.
What the oven must demonstrate
UT Dallas documents HMDS vapor priming as a photoresist adhesion process and describes combining dehydration and priming in the same vacuum chamber. Its process study also uses water contact angle to assess the treated surface.
Use those measurements as inputs to your own qualification plan, not as universal pass/fail limits. Ask your lithography engineer to define acceptable adhesion results for the substrate, resist and downstream process you intend to run.
Match wafer handling and installed configuration
Request the model, serial number, manuals and modification history. Ask the seller to identify:
- Wafer loading: supported dimensions for the installed carriers, loading arrangement and proposed test batch.
- Process hardware: chamber, heater controls, temperature sensors, vacuum equipment and chemical delivery components included in the sale.
- Facility interfaces: utility drawings, exhaust requirements and the documented safety-interlock sequence for that exact configuration.
- Control system: recipe access, software or license transfer terms, alarm history and available process-log exports.
Have your facilities and safety teams review the documentation before authorizing installation. Use the photoresist track buying guide to frame questions about the surrounding lithography workflow.
Set acceptance criteria before the purchase order
Write a protocol that identifies the test wafers, preparation steps, recipe, loading pattern, measurement locations and responsible reviewer.
- Physical condition: request photographs and inspection records for the chamber, seals and chemical delivery hardware. Have a qualified technician evaluate any damage against the OEM maintenance criteria.
- Process repeatability: request temperature and pressure traces across the agreed cycles, with sensor calibration records.
- Surface evaluation: specify your contact-angle measurement method and sampling plan; agree the limits in advance.
- Lithography result: test adhesion with your intended resist and downstream process. Record inspection results and define the rework or rejection terms.
- Handover: agree on documentation, training, installation checks and responsibility for any repeat acceptance test.
Keep physical inspection separate from process qualification using the semiconductor equipment inspection checklist.
Compare complete quotes
Ask each seller to itemize the oven, accessories, refurbishment, packing, transport, installation and test support. Obtain explicit warranty exclusions, acceptance remedies and delivery milestones. Use the used-equipment vendor checklist to review the evidence behind the offer.
What to send with an RFQ
Provide wafer dimensions, carrier requirements, substrate and resist details, intended batch size, available utilities and your draft acceptance protocol. Ask for the offered unit's serial number, included scope and a written response to every unresolved requirement.
Related Parts
Caladan stocks used and refurbished parts referenced in this article — tested, inspected, and ready to ship.