Skip to main content

Digital material passports - HONEXT®

Sustainability By Alex Mar Morales, Senior Sustainability Consultant – 31 October 2023

Collage of HONEXT® product examples and recycling of paper


Head and shoulders shot of Alex against a marble wall wearing glasses and a jumper

Alex Mar Morales

View bio
Gilles in a white shirt in front of a white marble effect wall

Gilles Alvarenga

View bio

This is part of the 'Unlocking sustainable designs through digital material passports' exhibited at The Summit — BE-ST Fest '23.

This material started with a vision to protect the planet and a challenge of how the polluting residue from paper and cardboard could be upgraded into something useful and valuable.

HONEXT® comes from waste and aims never to become waste again. These boards are made from primary paper waste sludge that is upcycled into non-toxic, recyclable, flame-retardant boards.

They are a bio-based, circular and carbon-negative alternative to traditional fiberboard, totally non-toxic and resin free. Lightweight, strong and with excellent acoustic properties, this product is fully recyclable and comes with a take-back system.


Product Name:

Product Site: HONEXT® - Circular materials for the built environment. (

Supplier: Maconda Materials

Material Origin

  • Raw Material Sourced:
  • Manufacture Site:
    Barcelona, Spain (Main Factory)
  • Biogenic Content (i.e. natural material content/sequestered carbon info):
  • Recycled Content:
    100% (Made from industrial cardboard waste)

Embodied Carbon

  • Embodied Carbon Value:
    Upfront Embodied Carbon: 92.5 kgCO2e/m3

    Biogenic Carbon: -751 kgCO2e/m3

    Product Lifecycle Embodied Carbon: -3.146 kgCO2e/m3

    Life Span: 25 years

    Product EPD is available online

Circularity, to cover aspects like:

  • Takeback schemes:
    HONEXT take back used products for recycling at end of life
  • Reuse Potential:
    High reuse and repurpose potential and a low amount of adhesive is needed so can be easily disassembled at end of its first life
  • Warranties:
    Not Specified

Health & Wellbeing

  • Material Emissions:
    Minimal VOC Emissions (Self-declared)
  • Material Content:
    Minimal VOC Content (Self-declared)
  • Ingredient Transparency:
    Disclosed ingredients: Recycled Cardboard, silicates, water (Third-party verified)
  • Hazardous Materials:
    None found (Third-party verified)


  • Cradle-to-Cradle Certified Gold
  • C2C Certified® Material Health Certificate™ Gold Level
  • Green Building Council Spain (Certificacion Verde)

What is a digital material passport?

A material passport is a digital document listing all the materials that are included in a product or construction during its life cycle in order to facilitate circularity decisions in supply chain management at the end of the building life.

At Cundall, we want to create a passport for materials and products that will also provide information before its use, so designers and contractors have a better understanding of the materials and their impact on the embodied carbon and health well-being of a project, facilitating the inclusion of the best low carbon and healthy materials that align with their design.