Quality & tolerances

With foam, quality cannot be fixed after the fact. Once a block has cured, the only remaining option is not to let it go further - which is why we measure at three points, not just at the end.

• Incoming - polyol, isocyanate, catalysts and additives are received with supplier documentation and stored under prescribed conditions.
• In-process - component ratio and foaming parameters. This is where everything measurable later is decided.
• Outgoing - density, hardness and dimensions of every batch.

The middle point matters most, not the final inspection. The polymer builds while the foam rises, simultaneously; too little catalyst and the block collapses into itself, too much and it cures before reaching the top of the mould. Neither failure can be corrected afterwards.

Four numbers describe a foam. Each answers a different question:

• Density (kg/m³) - mass of material per cubic metre. It says the most about durability: lower-density foam fatigues faster under the same load. Our range runs from 18 to 40 kg/m³.
• Compression hardness (CLD, kPa) - how strongly the foam resists pressure at 40% compression. This is what a customer feels by hand. Ours runs from 2.0 to 5.0 kPa.
• Tensile strength and elongation - how much force it takes before tearing. Matters where foam is pulled or tensioned: upholstery, lamination, footwear.
• Compression set - how much it stays compressed after a prolonged load. The most important number for a mattress or car seat, and the only one you cannot check on a sample - it shows after months.

A common misconception: density is not hardness. Foam can be dense and soft, and that is often exactly what a good mattress needs.

An article code is not a catalogue reference but measured data. The first two digits are density in kg/m³, the second two are hardness multiplied by ten.

PT 2541 means 25 kg/m³ density and 4.1 kPa hardness. PN 3540 is 35 kg/m³ and 4.0 kPa. The letters denote the family: PN standard, PT firm, PP extra firm, HR high-resilience, PE special purpose.

This is not only practical but a form of transparency - the code itself tells a customer what they are ordering, without requesting a data sheet. The colour in the code (`PN 3540 CRVENA`) is not a product variant but part of the reference: in a warehouse holding several hundred cubic metres, colour lets a worker tell densities apart at a glance, without a label that can fall off.

The full range with data for every article is in the foam catalogue.

Standard cutting tolerances and block dimensions will be published in table form once technical documentation is provided. Until then tolerances are agreed with the quote, per application - ask in an inquiry and you will receive them with the price.

Quality certificates exist for part of the range and are available on request. Scans and reference numbers will be published here once they are ready for public release.

One honest note that is rarely stated: the tensile and compression-set values on certificates stand as a requirement the grade must meet, not as the result of measuring the specific batch you received. That is common in the industry, but it is a distinction worth knowing. If your project needs a measurement of the specific batch, that is agreed with the order - we will not present a requirement as a measurement.