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Sack kraft papers

Nertop Semi Extensible High Porosity

Nertop Semi Extensible High Porosity is produced from 100% unbleached, virgin softwood fibres and is an ideal sustainable packaging solution where high resistance handling and high-speed filling is required.

Nertop Semi Extensible High Porosity is produced from 100% unbleached, virgin softwood fibres and is an ideal sustainable packaging solution where high resistance handling and high-speed filling is required.

Due to its high porosity, it is recommended for sacks of powdered products.

What are the technical characteristics of this product?

  • Weight range: 70 to 90gsm
  • Offers air resistance of 5s (ISO 5636-5) for quick filling without perforation
  • Used in valve sacks where quick filling is required
  • Can be used safely for various food packaging types. For detailed declarations please contact us.

What is this product commonly used for?

  • Cement and building materials
  • Powdered good, i.e. flour
  • Chemicals

A guaranteed supply from a trusted source

Our certified Chain of Custody is your guarantee of a verifiably sustainable packaging supply chain. 

At Smurfit Kappa we understand the importance of sustainability in everything we do, and see it as our responsibility to ensure the products we supply to our customers meet the highest chain of custody standards. 

  • 100% of paper produced and sourced for our packaging solutions is FSC®, PEFC™ or SFI™ Chain of Custody certified
  • 90% of packaging supplied to customers is FSC®, PEFC™ or SFI™ Chain of Custody certified


Look out for our stamp of proof on your invoice to give you total peace of mind around the origin of your paper-based packaging. 

Learn more about Chain of Custody.

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