Fibre-free closed-cell tube with a vacuum-formed skin: smoother surface, less dust pickup and easier cleaning — for clean rooms, laboratories and exposed pipework.
| Property | Class B | Class 0 same values |
|---|---|---|
| Cell structure | Closed cell | — |
| Material | NBR, fibre-free | — |
| Density | 65 kg/m³ standard · 55–90 kg/m³ to order | — |
| Thermal conductivity λ at −20 / 0 / +40 °C | 0.030 / 0.032 / 0.037 W/(m·K) | 0.030 / 0.032 / 0.037 W/(m·K) |
| Water vapour permeability | 1.96 × 10⁻¹¹ g/(m·s·Pa) | — |
| Moisture resistance factor μ | ≥ 10,000 | — |
| Oxygen index | ≥ 32 % | — |
| Flammability / smoke density | Self-extinguishing / smoke density 25–50 | — |
| Water absorption | ≤ 5 % | — |
| Service temperature | −57 °C to +125 °C | — |
| Flexibility / ozone resistance | Excellent / no crack | — |
| Surface | Vacuum-formed skin | |
| Inner diameter | 6–89 mm | |
Values are nominal production figures, tested per batch. Density, wall thickness and colour are produced to the customer's specification.
— means the value is identical for Class B and Class 0.
Inner diameter 6–89 mm (1/4″–3-1/2″) · wall thickness 6–50 mm (1/4″–2″). Intermediate sizes produced on request.
A closed-cell tube with a vacuum-formed skin rather than a moulded foam surface. The material is the same; the surface is different — smoother, denser at the face, and free of fibre.
Where the insulation becomes part of the cleanable envelope. A smooth, non-shedding surface can be wiped, whereas an open foam surface traps dust and cannot be cleaned to a validated standard.
The same argument: exposed pipework in a classified room, where the surface has to withstand routine cleaning and not release particles into the space.
Where the insulation is visible and hygiene is assessable. A smooth face also resists surface soiling, so it stays presentable without repainting or jacketing.
Some specifications exclude fibrous insulation in the occupied space for air-quality or contamination reasons. This product is fibre-free, which is a requirement rather than a benefit to be sold.
Same four inputs as the standard tube — the skin changes the surface, not the thermal calculation:
The vacuum-formed skin is not a vapour barrier in its own right — the closed-cell wall with μ ≥ 10,000 is. Joints still need to be glued and taped, and on a smooth surface the tape or adhesive has to be the matching closed-cell product so it bonds to the skin.
The surface. The foam is the same closed-cell NBR and the thermal and moisture data are the same; the skin is vacuum-formed, which gives a smoother, denser face that resists dust pickup and can be wiped. Thickness selection does not change.
No. The vapour resistance comes from the closed-cell wall (μ ≥ 10,000), not from the surface skin. On a chilled line the joints still have to be glued and taped, and the ends closed at flanges, valves and supports.
That is what it is produced for: fibre-free, smooth and cleanable, so the insulation can be part of a controlled environment instead of an accumulation point. Confirm your cleaning agents with us if they are aggressive.
Yes, and it is the sensible way to specify it: smooth tube on the exposed runs, standard tube in the ceiling void and plant areas where the surface is never seen. Same calculation, same insulation, one cost decision.
Send the inner diameter, wall thickness, class and quantity, or simply attach your BOQ. We quote FOB Shanghai as standard, EXW or CIF on request.
