Cryogenic Insulation Pipe

August 12th, 2026

Cryogenic Insulation Pipe

-253°C Cryogenic Insulated Fiberglass Pipe Material

This -253°C ultra-low temperature insulated fiberglass pipe is manufactured by impregnating specially treated fiber cloth with cryogenic-resistant resin, followed by hot pressing. It boasts excellent mechanical strength and thermal insulation performance, and is applicable to liquid hydrogen air separation equipment, cryogenic pipelines and tank trucks operating at -253°C.

2.1 Appearance

The surface shall be smooth, free of bubbles, wrinkles, cracks, obvious scratches and overheating marks. Slight wrinkles on the inner wall are acceptable, and both ends shall be neatly cut. For fiberglass pipes with wall thickness over 13 mm, minor interlayer cracks on machined end faces are permitted.

2.2 Dimensions and Dimensional Tolerances

2.2.1 Sizes

Classified by inner diameter as follows: φ20 mm, φ25 mm, φ50 mm, φ80 mm, φ100 mm, φ200 mm, etc.

2.2.2 Standard Thickness and Tolerances

2.2.2.1 Inner Diameter and Permissible Deviations

ID, OD and permissible tolerances are shown in the table below.

IDφ (mm)	Tolerance (mm)
≤150	±0.5
150 ＜ φ ＜ 200	±0.7
200 ＜ φ ≤ 300	±1.0
300 ＜ φ ≤ 500	±1.5
＞500	±2.0
IDφ (mm)	Tolerance (mm)
≤50	±0.5
50＜φ＜200	±1.5
200＜φ≤300	±2.0
300＜φ≤500	±2.2
＞500	±2.5

3. Performance Requirements

Physical and mechanical performance requirements are specified in the table below.

No.	Property	Direction	Unit	Requirement at Ambient Temperature	Requirement at -253°C
1	Density	—	g/cm³	1.65–1.95	1.65–1.95
2	Flexural Strength	—	MPa	≥340	≥420
3	Compressive Strength	Parallel to layer	MPa	≥250	≥360
3	Compressive Strength	Perpendicular to layer	MPa	≥310	≥420
4	Tensile Strength	Perpendicular to layer	MPa	≥210	≥280
5	Impact Toughness	Perpendicular to layer	J/cm²	≥22	≥35
6	Interlaminar Shear Strength	—	MPa	≥30	≥35
7	Transverse Shear Strength	—	MPa	≥80	≥100
8	Thermal Conductivity	—	W/(m·K)	≤0.50	≤0.43

Cryogenic Insulation Pipe