At Coresix, cleanliness is treated as an independent technology, procedures for which are continuously monitored and improved upon. With many of today’s technologies, the introduction of foreign matter to the process can have serious impact on production yields and product performance. Coresix provides a unique niche in our ability to clean glass and maintain the highest level of cleanliness to the customer’s door.

Cleanliness Defined

  • Inspection
    Coresix has various inspection methods and standards for cleanliness and packaging depending on the sensitivity of the application to particulate and stains.
  • Particulate
    Any debris which is external to the glass component. For our purposes, we consider non-removable particulate as debris which can not be removed with an air gun.
  • Spots and Stains
    Any non-particulate residue or pattern left on the surface of the glass after final preparation such as water spots, haze, streaks, etc.

Cleaning Process 

  • Process
    The standard cleaning procedure for most glass components produced at Coresix is a Mechanical Scrub followed by an Ultrasonic Wash which feeds directly into a class 100 Optical Clean Room.
  • Pre-Cleaning
    All steps in the fabrication process prior to cleaning can have an impact on the cleanliness of the final product. Therefore, our entire process is engineered to minimize the introduction of particulate and to maximize the effectiveness of our cleaning procedures.

  • Mechanical Wash
    As a standard, glass components are scrubbed to remove heavy particulate such as glass residue from grinding operations, polishing compounds and other elements typically not affected by ultrasonics.

  • Ultrasonic Wash 1
    Unless otherwise specified, all glass components less than 300mm diagonal are cleaned through our 10 stage Ultrasonic Line. The first and third stages use an optical soap, the second and fourth through ninth are progressively filtered DI water rinses. The final stage is an IPA vapor bath which removes residual moisture from the parts.

  • Ultrasonic Wash 2
    Coresix runs a second Ultrasonic Wash line with size capabilities to 550mm diameter. This is a 6 stage system with a slow pull, filtered air dry. This line runs tandem to the USW1 and also feeds directly into the Class 100 Clean Room.
  • Clean Room
    Our optical clean room is a completely darkened environment for maximum effectiveness of the inspection lighting and is certified to class 100. All cleanliness and surface quality critical components are inspected and packaged within the clean room.


A critical aspect of cleanliness is the type of packaging in which the product is shipped. The container must be designed to minimize movement and contact that may generate particulate from the glass components or the container itself. If a non-contact shipping system is required and not commercially available for a given component, Coresix can develop custom packaging to meet your needs. Following are typical packaging specifications for various components: 

  • Wafer Container
    For standard size wafers, we use Semiconductor wafer containers which are pre-cleaned. Once loaded within the Class 100 Clean Room, the container is double bagged and vacuum sealed for shipment.

  • Custom Container
    Usually vacuum drawn anti static PVC, trays can be designed for most non-standard parts up to six inches. Once parts are packed in the trays, they are double bagged and vacuum sealed within the Class 100 Clean Room.

  • Coroplast Wrap
    A low cost, clean room compatible alternative for parts from four inches to twenty inches, a coroplast board with adhered plastic teeth is formed into a “wrap” to envelop the parts in groups of five or ten. The bundle is then bagged prior to shipment.

  • Tissue Interleaf
    For less critical applications, parts can be wrapped or interleafed with clean room tissue paper, then shrink wrapped to minimize particulate.