How to Choose the Right Compliance Certification for Your Flat
By Zygo | Published: 2026-10-28
Category: Buying Guides
Learn how to choose the correct compliance certification for your 18", 24", or 32" flat. Compare options, understand what each certificate covers, and find your best fit.
Quick answer
Match the compliance certification to your flat's exact diameter. Zygo offers certificates for 18", 24", and 32" flats, each documenting compliance to catalog value for that specific size.
Why size matters for compliance certification
Each compliance certification is tied to a specific flat diameter. A certificate for a 24" flat verifies that particular optic meets its catalog value, while a certificate for an 18" or 32" flat does the same for its respective size. Choosing the wrong size means your certification won't match the flat you need to document.
What the certificate covers
The compliance certification documents that the flat meets its stated catalog value. It does not include detailed measurement data or calibration results—it is a statement of compliance. If you need a full calibration report with numerical results, look for a calibration certification service instead.
Decision rules for choosing your certification
- Match the diameter exactly: Select the certificate that corresponds to your flat's diameter: 18", 24", or 32". Using a mismatched size invalidates the certification.
- Determine if compliance is enough: If you only need a statement that the flat meets its catalog specification, a compliance certification is sufficient. If you need measured values, look for a calibration certificate instead. Consider your documentation requirements before ordering.
- Check your flat's brand and model: The certification is for Zygo-branded flats. If your flat is from another manufacturer, verify it can be certified under this service.
Product facts
- Compliance Certification 24" Flat: Certificate of Compliance to catalog value for a 24-inch flat. This is the correct choice if you own a 24" flat and need proof it meets its specified performance.
Compliance Certification 24" Flat - Compliance Certification 18" Flat: Certificate of Compliance to catalog value for an 18-inch flat. Choose this for 18" flats when you need a compliance document that matches that exact size.
Compliance Certification 18" Flat - Compliance Certification 32" Flat: Compliance Certification for a 32" flat, documenting compliance to catalog value. Ideal for 32" flats where a compliance statement is required without additional calibration data.
Who should choose which certification
Best for
- Operators with a Zygo 18", 24", or 32" flat who need a simple compliance statement
- Quality assurance teams that require documentation that a flat meets its catalog value
Not for
- Users who need a full calibration report with numerical measurement data
- Those with flats from other manufacturers without prior compatibility confirmation
