1. Technical Overview

SAXOBRAN SAPWT50 is a wet-laid non-woven fiberglass pipe wrapping tissue engineered for continuous factory pipe coating yards and field pipeline-wrapping machines. 

We manufacture this fiberglass tissue as an inner reinforcement carrier embedded directly inside hot-applied bitumen, coal tar enamel, and asphalt anti-corrosion coatings. 

The 50g/m² fiber matrix maintains high spiral-winding pull tension at molten enamel temperatures up to 230°C. 

Pipeline coating lines integrate SAPWT50 around rotating steel pipes to lock enamel thickness, stop coating sag, eliminate air pinholes, and prevent soil stress cracking on buried oil and gas transmission lines.

2. Technical Specifications Table (TDS)

3. Key Features & Workshop Problem Solvers

Zero Pinholes and Holiday Detector Failures During Hot Enamel Coating

Trapped moisture and uneven fiber pockets create micro-pinholes when molten bitumen or coal tar enamel hits the wrap, causing high-voltage holiday detector alarms and costly pipe rework. 

SAPWT50 fiberglass pipe wrapping tissue arrives sealed at ≤ 1.0% moisture content with a uniform wet-laid porosity. Liquid enamel saturates the mat instantly without air entrapment, delivering clean, defect-free dielectric protection.

High Spiral-Winding Pull Strength Eliminates Line Snaps

Weak wrapping veils snap under automated brake tension on continuous spiral pipe-coating lines, halting production and ruining enamel thickness uniformity. SAPWT50 fiberglass tissue delivers longitudinal tensile strength of ≥ 220 N/50mm. This high pull resistance handles heavy winding tension on large-diameter transmission pipes without tearing or necking down.

Stops Coating Sag and Soil Stress Cracking Underground

Unreinforced asphalt and coal tar coatings sag on warm pipes in the yard and crack under heavy soil shear stress after burial. SAPWT50 embeds directly into the coating layer as a structural skeleton. The inorganic glass matrix holds molten enamel evenly around the entire pipe circumference and resists root penetration and soil movement for decades.

4. Target Applications & Processing Lines

Underground Oil & Natural Gas Transmission Pipelines

Pipeline coating plants wind SAPWT50 fiberglass pipe wrapping tissue spirally into hot-applied coal tar enamel or modified bitumen layers on carbon steel pipes. The fiberglass tissue reinforces the anti-corrosion barrier, boosts impact resistance during trench backfilling, and prevents cathodic disbondment.

Municipal Water Mains & Industrial Buried Piping

SAPWT50 serves as the primary inner wrap reinforcement for buried steel water pipelines, district heating pipes, and chemical transfer lines. The fiberglass pipe wrapping tissue prevents coating cold-flow, resists groundwater chemical attack, and locks overlap seams tight against moisture ingress.

5. Frequently Asked Questions (Technical FAQ)

Q: How does SAPWT50 fiberglass pipe wrapping tissue prevent pinhole defects during hot enamel coating?

A: SAPWT50 uses an open, uniform wet-laid glass fiber structure paired with ultra-low moisture content (≤ 1.0%). When pulled into molten bitumen or coal tar enamel up to 230°C, the fiberglass pipe-wrapping tissue lets air escape cleanly without flashing moisture into steam bubbles, passing high-voltage holiday spark testing on the first run.

Q: Can SAPWT50 handle high spiral-winding tension on large-diameter steel pipes?

A: Yes. SAPWT50 fiberglass tissue provides a Machine Direction tensile strength of ≥ 220 N/50mm and Cross Direction strength of ≥ 70 N/50mm. It maintains tight, wrinkle-free overlap tension across automated spiral-wrapping heads without edge tearing or web breaks.

Q: Is SAPWT50 compatible with both coal tar enamel and modified bitumen pipeline coatings?

A: Yes. SAPWT50 uses a heat-resistant thermosetting binder formulated specifically for hot-applied coal tar enamel, oxidized asphalt, and polymer-modified bitumen systems. It wets out completely in the flood coat box and locks into the anti-corrosion layer without delaminating.