T-FIT® Cleanroom Insulation
How do you close the longitudinal joints and butt joints of T-FIT® Clean insulation without compromising the vapour barrier or fire performance? T-FIT® ZAXX9164 PVDF tape provides the answer: a pressure-sensitive adhesive with a PVDF film on the same material as the insulation, designed to be applied dry, without primer, on all elbow, tee, straight and box joints.
T-FIT® Clean brochure (PDF) (including installation guide)
ZAXX9164 PVDF tape data sheet (associated consumable)
Straight lengths, 90° elbows, tees, reducers and valve/flange boxes, ZOTEK® F PVDF material, 6.35 mm thickness
Modular insulation moulded from Zotefoams ZOTEK® F closed-cell PVDF foam. FDA-compliant resin. Single thickness of 6.35 mm across the entire range, 920 mm straight lengths. Compatible with the three families of process tubes: ASME BPE (0.25 to 4 inches), DIN 11850 (DN8 to DN100), ISO 1127 (DN6 to DN80). Version with integrated tape or without tape (reference -NT). 90° elbows, equal tees, reducers and valve/flange boxes available in the same DN sizes. The only insulation system to meet the FM4910 Cleanroom Materials protocol.
What it is for
Mineral wool and conventional elastomeric foams have no place in a cleanroom. They emit, shed fibres, absorb moisture and perform poorly in fire. T-FIT® Clean starts from the opposite end: a closed-cell PVDF foam, fibre-free, particle-free, with near-zero VOCs, inherently hydrophobic, FM4910 tested. Fire behaviour is classified Euroclass B-s1,d0 and ASTM E84 0/10. AS 1530 gives 0/0/0/1. On this point, no other polymer or elastomeric insulation does better.
Typical applications: WFI and Purified Water loops, solvent loops in microelectronics, low-pressure pure steam lines, hot or cold piping in ISO 5 to ISO 8 zones, process HVAC, refrigeration, specialty gases, personnel protection on hot lines. Service range -80°C to +160°C, effectively 158°C under 5 bar steam.
Dry installation, with no power tools and no respiratory PPE. Installation is carried out on a line that is shut down, at ambient temperature, between 15°C and 40°C. Moulded parts (elbows, tees, boxes) are installed first. Straight lengths are cut with a long-bladed knife in a mitre box, slightly over length so they are installed in compression, with butt joints closed. Longitudinal joints are sealed with T-FIT® silicone sealant and closed with ZAXX9164 PVDF tape.
Durability stated by Zotefoams: a 10-year refit interval, compared with the usual removal-reinstallation cycles of degraded insulation. Over the lifetime of the plant, the economic argument lies in the cumulative cost, not the price per linear metre.
Range and coverage by tube standard
Three families of process tubes are covered in straight lengths, 90° elbows and equal tees. The complete catalogue of references is provided in Excel format, one sheet per standard. Below is the summary of coverage, thickness and length.
| Tube standard | Straight lengths range | 90° elbows range | Equal tees range |
| ASME BPE | 0.25 to 4 inches (6.35 to 101.60 mm) | 0.375 to 4 inches | 0.375 to 3 inches |
| DIN 11850 | DN8 to DN100 (10 to 104 mm) | DN8 to DN80 | DN8 to DN65 |
| ISO 1127 | DN6 to DN80 (10.20 to 88.90 mm) | DN6 to DN80 | DN6 to DN65 |
All parts in the range have a single thickness of 6.35 mm (0.27 inch). Straight lengths are supplied in 920 mm unit lengths. Elbows and tees are supplied as moulded parts with fixed geometry for each DN. All straight-length references exist in two versions: with integrated PVDF tape (standard reference) or without tape (suffix -NT), so the consumable can be added separately according to stock logistics.
The complete catalogue of references, one sheet per standard, is available as an attachment.
Reducers and valve / flange boxes
Reducers: most diameter changes are handled by overlapping two straight lengths of adjacent sizes, as the 6.35 mm thickness allows the larger tube to overlap the smaller one. For non-standard cases, moulded reducers are available on request.
Valve and flange boxes: moulded shells that open into two half-shells, with holes matched to the outside diameter of the incoming and outgoing insulation. Additional hole for the valve stem. Variable dimensions, not standard catalogue items: selection to be made with the technical team according to the geometry of the component to be insulated.
Material properties
| Characteristic | Value |
| Material | ZOTEK® F closed-cell PVDF foam, FDA resin |
| Thickness (straight lengths, elbows, tees, boxes) | 6.35 mm (0.27″) across the entire range |
| Straight length | 920 mm |
| Service temperature | -80°C to +160°C (-112°F to +320°F) |
| 5 bar steam temperature | 158°C effective maximum |
| Thermal conductivity at 0°C | 0.031 W/m.K |
| Thermal conductivity at 25°C | 0.034 W/m.K |
| Thermal conductivity at 80°C | 0.042 W/m.K |
| Euroclass fire resistance | B-s1,d0 (EN 13501-1, 6.35 mm thickness) |
| US fire resistance | ASTM E84 / UL723: 0 flame / 10 smoke |
| AS fire resistance | AS 1530: 0/0/0/1 (6.35 mm), 0/0/0/0-1 (12.7 mm) |
| Cleanroom | FM4910 Cleanroom Materials Protocol: specification tested |
| Water vapour permeability | µ = 8,750 per ISO 1663:2007(E) |
| Total outgassing (VDI 2083-P17) | 44.18 µg/g |
| AMC class (ISO 14644-8) | -8.5 |
| Fungal resistance | ASTM G21-15: no growth after 28 days |
| Leachable ions | ASTM C-871: pass |
| Stated refit interval | 10 years |
Frequently asked questions
Why a single thickness of 6.35 mm?
ZOTEK® F PVDF has very low thermal conductivity (0.034 W/m.K at 25°C) and a closed-cell structure with µ = 8,750. At 6.35 mm, the insulation meets thermal and condensation control targets in most cleanroom applications from -80°C to +160°C. The single thickness simplifies stock and layout. For extreme cases (very low continuous temperature, beyond -80°C), consult the supplier.
Is an external vapour barrier (jacketing) needed?
No. The material is closed-cell, µ = 8,750 per ISO 1663:2007. No sheet metal or PVC film jacketing is required, provided that all longitudinal joints, butt joints, elbows, tees and boxes are correctly sealed with T-FIT® silicone sealant and taped with ZAXX9164 PVDF.
Version with tape or without tape (-NT): which should I choose?
With integrated tape: ZAXX9164 tape is pre-applied along the length of the tube, with liner. Saves time on site, guaranteed consistency. Without tape (reference -NT): the tube is delivered bare and the tape is purchased separately. Useful for regional stocking where tape is added to the order as needed. Functionally identical.
ATEX compatible?
ZOTEK® F PVDF is not claimed as ATEX by Zotefoams. The Euroclass B-s1,d0 classification means limited contribution to fire and low smoke opacity, but does not imply suitability for use in an ATEX zone. Case-by-case analysis according to the zone.
Compatible with the process line’s CIP / SIP?
The insulation is external and is not in contact with the process fluid. What matters is the tube skin temperature during cycles. Under pure steam at 5 bar (saturation temperature approximately 158°C), T-FIT® Clean holds. Beyond that (SIP at 165°C+ over long cycles), consult the supplier.