GT550 Outer-Wrap Manufacturer
GT550 Outer-Wrap
GT550 Outer-Wrap is bitumen-impregnated non-woven glass fiber reinforced fabric which is impregnated with bitumen enamel to ensure optimum protection of the fibers and to facilitate bleed-through of the enamel.
The product is manufactured to an exact degree of porosity which promotes effective adhesive between outer-wrap and enamel.
GT550 comprises a uniform fabric of chemically resistant borosilicate glass, reinforced longitudinally with continuous filament glass yarns at 8-10 mm centers.
This type of outer-wrap is suitable for most soil conditions.
Application of GT550 Outer-Wrap
Bitumen Enamel is applied to steel pipes, previously primed with Synthetic Primer, at 215-230°C. Also, one or two layers of inner-wrap and one layer of outer-wrap are used in this coating system.
Storage
GT550 Outer-wrap is stored upright on a dry surface. The product should not be exposed to direct sunlight and maximum storage height is 2.50 m.
Standards
GT550 meets and exceeds the requirements for outer-Wraps in EN 10300, type B and AWWA C 203.
Quality Control
All raw materials for GT550 are tested and approved in the laboratories of Merco BITUMEN Co. The quality of the finished outer-Wrap is controlled in accordance with related standard or customer’s specific requirements and a test certificate is provided for each batch produced.
Technical Data of GT550 Outer-wrap
| Properties | Unit | Requirement | Method of test |
| Mass per area of base glass/carrier | gr /m2 | Min 80 | EN 10300, Annex M |
| Type of base glass/carrier | — | Non-woven glass fibre tissue | — |
| Mass per area | gr /m2 | Min 550 | EN 10300, Annex M |
| Thickness | mm | Min 0.76 | EN 1849-1a |
|
Tensile Strength – Longitudinal – Transverse N |
N/50mm N/50mm |
Min 300 Min 230 |
EN 12311-1 modified as in Annex N of EN 10300 |