Kvadrat Steelcut Trio 3
For many Vitra Aluminium Group chairs, the original upholstery is the well-known Hopsak fabric. When restoring these chairs, we use Kvadrat Steelcut Trio 3, widely considered one of the best modern alternatives to classic Hopsak.
Steelcut Trio was originally designed by Frans Dijkmeijer and later refined with updated colourways by Giulio Ridolfo. The textile is made from high-quality wool and developed as a durable upholstery fabric for intensive use in offices and public interiors.
What makes Steelcut Trio 3 particularly suitable for Vitra Aluminium chairs is its distinctive three-dimensional weave. The surface structure, created from three differently coloured yarns, forms a subtle pattern of small pyramid-like points. This gives the fabric a lively texture and depth that closely resembles the visual character of traditional Vitra Hopsak upholstery.
In addition to its appearance, Steelcut Trio 3 offers excellent durability and comfort. The wool-rich composition makes the fabric breathable, resilient and resistant to wear, which is essential for chairs designed for daily use.
Because of its texture, strength and authentic look, Steelcut Trio 3 is one of the most suitable fabrics for restoring Vitra Aluminium Group chairs while maintaining the design intent of the original upholstery.

Kvadrat Steelcut Trio 3 is a premium wool upholstery textile widely regarded as one of the best modern alternatives to classic Hopsak upholstery. Designed by Frans Dijkmeijer and refined by Giulio Ridolfo, the fabric features a distinctive three-dimensional weave created from three differently coloured yarns. This construction gives the textile a rich texture, subtle depth and exceptional durability. Thanks to its robust structure and refined appearance, Steelcut Trio 3 is an outstanding choice for reupholstering Vitra Aluminium Group chairs, closely capturing the character of traditional Hopsak while offering the performance of a high-quality contemporary contract fabric.

Kvadrat Steelcut Trio 3 is a premium wool upholstery textile widely regarded as one of the best modern alternatives to classic Hopsak upholstery. Designed by Frans Dijkmeijer and refined by Giulio Ridolfo, the fabric features a distinctive three-dimensional weave created from three differently coloured yarns. This construction gives the textile a rich texture, subtle depth and exceptional durability. Thanks to its robust structure and refined appearance, Steelcut Trio 3 is an outstanding choice for reupholstering Vitra Aluminium Group chairs, closely capturing the character of traditional Hopsak while offering the performance of a high-quality contemporary contract fabric.
Kvadrat Steelcut Trio 3 is a premium wool upholstery textile widely regarded as one of the best modern alternatives to classic Hopsak upholstery. Designed by Frans Dijkmeijer and refined by Giulio Ridolfo, the fabric features a distinctive three-dimensional weave created from three differently coloured yarns. This construction gives the textile a rich texture, subtle depth and exceptional durability. Thanks to its robust structure and refined appearance, Steelcut Trio 3 is an outstanding choice for reupholstering Vitra Aluminium Group chairs, closely capturing the character of traditional Hopsak while offering the performance of a high-quality contemporary contract fabric.
Kvadrat Steelcut Trio 3 is a premium wool upholstery textile widely regarded as one of the best modern alternatives to classic Hopsak upholstery. Designed by Frans Dijkmeijer and refined by Giulio Ridolfo, the fabric features a distinctive three-dimensional weave created from three differently coloured yarns. This construction gives the textile a rich texture, subtle depth and exceptional durability. Thanks to its robust structure and refined appearance, Steelcut Trio 3 is an outstanding choice for reupholstering Vitra Aluminium Group chairs, closely capturing the character of traditional Hopsak while offering the performance of a high-quality contemporary contract fabric.


Kvadrat Steelcut Trio 3


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Product specification
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Solid
90% wool, worsted10% nylon
770 g/lin. m (24.84 oz/ ly)
100,000 Martindale
4 (ISO 1-5)
6-7 (ISO 1-8)
SN 198 898 5.3 with treatment • ASTM E84 Class A Unadhered • BS 5852 crib 5 with treatment • AS/NZS 3837 class 2 • ÖNORM B1/Q1 • AS/NZS 1530.3 • UNI 9175 1IM • NFPA 260 • ASTM E84 Class B Adhered • IMO FTP Code 2010 Part 8 • BS 5852 part 1 • BS 7176 Low Hazard • EN 1021-1/2 • NF D 60 013 • US Cal. Bull. 117-2013 • EN 13501 B-s2, d0 with treatment
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