# Cut-off for Materials in very small quantities **URL:** \ **Category:** Product LCA, EPDs & Data\ **Created:** [March 25, 2025, 2:47pm UTC](https://community.oneclicklca.com/t/cut-off-for-materials-in-very-small-quantities/2062 "2025-03-25T14:47:47Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![david](https://avatars.discourse-cdn.com/v4/letter/d/aeb1de/32.png) [@david](https://community.oneclicklca.com/u/david)\ **Post date:** [March 25, 2025, 2:47pm UTC](https://community.oneclicklca.com/t/cut-off-for-materials-in-very-small-quantities/2062/1 "2025-03-25T14:47:47Z")
We are modelling a Chemical mixture used in construction. There are 3 materials in very small quantities 0.3%,0.28% and 0.06%. For two of these there are no Ecoinvent datapoints or close analogues. Our previous OneClick Mentor said we should try and model everything - however my feeling is that these constituents will have minimal impact. Can we ignore these ? And how should we reference that we have done it? During the LCA Bootcamp a 1% cut-off was mentioned I remember. Thanks ---
**Author:** ![Steven](https://dub1.discourse-cdn.com/flex013/user_avatar/community.oneclicklca.com/steven/32/4_2.png) [@Steven](https://community.oneclicklca.com/u/Steven)\ **Post date:** [March 26, 2025, 9:12am UTC](https://community.oneclicklca.com/t/cut-off-for-materials-in-very-small-quantities/2062/2 "2025-03-26T09:12:11Z")
Hi David, It’s generally best to include as much detail as possible in your model. The 1% cut-off rule applies to the total mass and energy contributions. If a component represents less than 1% of the total mass or energy, you can usually exclude it. However, this rule doesn’t apply if that component, even at a low percentage, significantly impacts emissions. For example, if a chemical representing only 0.3% of the total mass contributes 5% of the product’s emissions, you must include it in your model. Steven