Be carefully with such comparison tables!
The given film system classes depend no only on the film type but also on the exact development conditions (chemisty, temperature and times). So if you are seeking for a replacement of D4 in AGFA standard process, you seach fo another film type in film system class D3 according to ISO 11699-1. Any other film in film system class C3 will be equivalent to AGFA D4. Ask you dealer for film type AND development conditions to reach film system class C3.

Film equivalency in radiography is governed by film system classification rather than direct brand-to-brand matching. Caleb is right that you cannot simply swap film types between manufacturers without understanding the classification system.

ISO 11699-1 defines film system classes (D1, D2, D3, D4, D5, etc.) based on the combination of film type and development conditions. Two films from different manufacturers are equivalent only if they belong to the same film system class under identical development parameters: chemistry, temperature, time and agitation.

So to find a DuPont equivalent for Agfa D4, you need to:

- Identify the film system class that Agfa D4 belongs to under your current development process. If you use Agfa standard process, D4 falls into class D3 (the class name describes the film, not the process).
- Look for any film type from DuPont or another manufacturer that reaches the same film system class under the same development conditions.
- Contact your film and chemistry supplier with both the Agfa film type AND your exact development parameters: they can recommend a DuPont film type that will deliver equivalent results.

Never assume two films are equivalent based on their brand names or speed ratings alone. The development conditions are as critical as the film itself. If you change films without verifying the film system class match, you risk inconsistent sensitivity and image quality in your radiographs.

Your procedure or purchase specification should always reference the required film system class, not individual film brands, to allow flexibility in sourcing while maintaining quality.