Start with the service pipe
Define operating temperature, cycling, diameter, pipe material and the temperature objective outside the insulation system.
Preformed rigid microporous section
SilthermPipe
Preformed microporous insulation for straight pipes, elbows and defined curves.
Siltherm Pipe is a preformed microporous section for straight pipework, elbows and other defined curves. It reduces site shaping and gives consistent radial coverage.
Nominal diametersDN13-DN300
Standard length500 mm
Single layer20-50 mm
Classification temperature1000 C
Radial insulation build-up
A preformed route from service pipe to protected exterior.
The preformed section creates the thermal layer around the service pipe. Joints and external protection complete the installed construction.
PIPE
Fit the preformed section
Match nominal diameter, insulation build-up and curved segments to the pipe geometry for a close, repeatable fit.
Close the complete construction
Covering, joints, fixation, weather protection, access and adjacent equipment remain complete-system responsibilities.
Diameter and layer architecture
Specify diameter, fit and layer architecture.
Standard sections cover nominal diameters DN13-DN300 in 500 mm lengths, with single- and double-layer configurations. Custom diameters and elbows can be discussed for the application.
Standard minimumDN13
Standard maximumDN300
- DN13
- DN15
- DN19
- DN20
- DN25
- DN32
- DN40
- DN50
- DN65
- DN80
- DN90
- DN100
- DN113
- DN125
- DN150
- DN175
- DN200
- DN250
- DN300
DN denotes nominal pipe diameter. The sizes below are standard options; intermediate or alternative diameters should be confirmed with Siltherm.
One formed thickness around the named nominal diameter.
A layered build-up listed for duties requiring a greater nominal insulation thickness.
Thermal performance
Thermal performance across the temperature range.
ASTM C177 values describe the microporous core at the stated mean temperature. Diameter and insulation thickness then determine the installed heat-loss calculation.
Classification temperature is not the same as a recommended continuous-use temperature. Installed performance depends on the complete pipe construction and actual operating conditions.
Thermal conductivityW/m.K
ASTM C177 / microporous core- Test basis
- ASTM C177 / microporous core specimen
- Nominal density
- 280 kg/m3 +/- 10%
- Cold compressive strength
- 0.30 MPa at 10% deformation / ASTM C165
- Linear shrinkage
- <=2.5% / 24 h full soak at 1000 C / ASTM C356 / pure core
Available surface options
Select the covering as part of handling and integration.
Choose glass fleece, aluminium foil or glass cloth to suit the required handling and surrounding interfaces.
Glass fleece
A lightweight surface covering for the formed microporous section.
Aluminium foil
A foil covering option for defined handling and interface requirements; seams and external protection remain part of the installation design.
E-glass cloth
A cloth covering for robust handling and integration requirements.
Length, joint and fixing sequence
Define the installation route for the formed sections.
Sections can be cut to length, joined and fixed using methods familiar from comparable insulation systems. Joint layout and fixing details should be agreed for the project.
- 01
Set out
Confirm nominal diameter, straight length, elbow or special curved segment.
- 02
Cut and join
Cut sections to the reviewed length and locate joints around the full pipe route.
- 03
Fix and protect
Define fixation, covering and external protection for the complete service environment.
Typical applications
Preformed insulation for high-temperature piping and equipment.
Siltherm Pipe serves oil and gas process lines, steam systems and renewable-energy equipment. It can also form part of a defined jet-fire protection assembly.
Oil and gas process piping
Preformed backup insulation for process and steam piping in oil and gas, power-generation and energy equipment, with related tank geometry reviewed as part of the application.
Discuss an oil and gas applicationPEFC stacks and concentrated solar power
Preformed insulation for domestic PEFC stack interfaces and piping in parabolic-trough or central-receiver solar systems.
Discuss an energy routeJet-fire protection around steel pipes
Preformed Pipe sections can be incorporated into jet-fire protection assemblies; any performance claim must refer to the complete tested configuration.
Review the protection boundary- Document
- Siltherm Pipe Product Data Sheet
- Current revision
- July 2025
- Product grade
- Grade 1000
- Size options
- Metric / standard and customised routes
Application discussion
Share the pipe duty, diameter and available radial build-up.
Tell us the service temperature, nominal diameter and available radial build-up. Include any elbows or special curved sections.
Discuss a Pipe applicationDo not include proprietary piping drawings or confidential construction details in the initial enquiry.