---
title: Commercial Bulletin - Gradings and Guards Material
description: Cycle length of a hydroprocessing unit is typically controlled either by catalyst activity or by reactor pressure drop.
image: https://resources.axens.net/hubfs/Landing%20Pages/Resources/Commercial%20Bulletin/Thumbnails%20CB/Thumb_Axens_CB_Grading-%26-Guard-Materials_1.png
---

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 Commercial Bulletin

# Gradings and Guards Material

## Pressure Drop Management: Improving Reactor Availability

![Thumb\_Axens\_CB\_Grading-&-Guard-Materials\_1](https://resources.axens.net/hubfs/Landing%20Pages/Resources/Commercial%20Bulletin/Thumbnails%20CB/Thumb_Axens_CB_Grading-%26-Guard-Materials_1.png)

Cycle length of a hydroprocessing unit is typically controlled either by catalyst activity or by reactor pressure drop.

 

With the increasing variety and difficulty of feedstocks treated in the refinery, including renewables, there is a need to use state-of-the-art grading and guard materials to mitigate pressure drop and thus maximize the use of the main catalyst and the unit cycle length.

 

 

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