HDPP Outer Protective Tape
ISO 21809-3/13 Compliant | 150 mm * 30 m * 0.5 mm | Mechanical & UV Protection for 3LPE Repair
Product Overview
Our HDPP Outer Protective Tape is a high-performance outerwrap tape designed to restore and protect the external barrier of 3LPE-coated pipelines following field joint coating or coating repair. Constructed with a tough polyethylene backing and a homogeneous elastomeric sealant adhesive layer, this tape delivers mechanical protection, impact resistance, moisture resistance, and UV protection—forming the outermost layer of a complete viscoelastic repair system.
Supplied in a 150 mm * 30 m * 0.5 mm roll and qualified to ISO 21809-3/13, the HDPP Outer Protective Tape is the ideal final layer to ensure the repaired coating achieves the durability and performance of the original 3LPE system.
Product Specifications
| Parameter |
Specification |
| Product Type |
Outer protective tape (outerwrap) |
| Backing |
Polyethylene (HDPP) |
| Adhesive |
Homogeneous elastomeric sealant |
| Dimensions |
150 mm (Width) * 30 m (Length) * 0.5 mm (Thickness) |
| Standard |
ISO 21809-3/13 |
| Application |
Outermost protective layer over viscoelastic inner tape systems |
| System Compatibility |
3LPE repair systems |
Key Features & Benefits
| Feature |
Benefit |
| Mechanical Protection |
High-strength PE backing resists impact, indentation, and abrasion during backfilling and service |
| Impact Resistance |
Protects the underlying viscoelastic inner tape from mechanical damage |
| Moisture Resistance |
Elastomeric sealant adhesive forms a watertight barrier against moisture ingress |
| UV Protection |
PE backing shields the underlying coating system from UV degradation in exposed or above-ground sections |
| Restores Outer Barrier |
Reproduces the protective function of the original 3LPE outer layer |
| Homogeneous Elastomeric Sealant |
Provides strong adhesion to the inner tape and maintains flexibility over time |
| ISO 21809-3/13 Qualified |
Meets the international standard for field joint coating outerwrap performance |
| Thin and Conformable (0.5 mm) |
Easy to apply over irregular surfaces while providing effective protection |
System Integration
The HDPP Outer Protective Tape is designed as the outermost layer of a complete 3LPE repair system. Typical system configuration:
| Layer |
Product |
Function |
| 1 (innermost) |
Viscoelastic Inner Tape |
Direct adhesion to steel and PE; primary corrosion barrier |
| 2 |
HDPP Outer Protective Tape (this product) |
Mechanical protection, impact resistance, moisture barrier, UV protection |
The HDPP tape is applied over the viscoelastic inner tape, overlapping onto the adjacent sound 3LPE coating to create a continuous, sealed outer barrier.
Typical Properties (Reference)
| Property |
Typical Value |
| Backing Material |
High-Density Polyethylene (HDPE) |
| Adhesive Type |
Homogeneous elastomeric sealant |
| Total Thickness |
0.5 mm |
| Width |
150 mm |
| Length |
30 m per roll |
| Standard Classification |
ISO 21809-3/13 |
| Color |
Black (standard) or as specified |
| Service Temperature |
Compatible with 3LPE repair service conditions |
| UV Resistance |
Yes (PE backing) |
Values are indicative and shall be confirmed against the specific CNPetro product data sheet.
Compliance with ISO 21809-3/13
ISO 21809-3 specifies requirements for field joint coatings on buried and submerged pipelines. The /13 classification designates an outerwrap tape system qualified for the specified operating temperature range. The HDPP Outer Protective Tape is tested and certified to meet the performance requirements of this classification, including impact resistance, indentation resistance, and thermal ageing.
Primary Applications
3LPE pipeline repair – Outermost protective layer over viscoelastic inner tape systems
Field joint coating – Mechanical and UV protection for repaired joints
Buried and submerged pipelines – Onshore and offshore environments
Above-ground sections – UV protection where the pipeline is exposed
Coating rehabilitation – Restoration of the outer barrier properties of aged 3LPE coatings
Application Summary
Surface Preparation: Ensure the underlying viscoelastic inner tape is clean, dry, and free of contaminants.
Apply HDPP Tape: Starting at one end, apply the tape spirally over the inner tape with the specified overlap (typically 50%), pressing firmly to ensure intimate contact.
Overlap onto Sound Coating: Extend the HDPP tape onto the adjacent sound 3LPE coating to create a continuous sealed barrier.
Inspect: Verify complete coverage, sealed edges, and proper overlap. No curing time is required before backfill.
Packaging and Availability
| Item |
Details |
| Roll Dimensions |
150 mm * 30 m * 0.5 mm |
| Packaging |
Individually wrapped rolls in cartons |
| Customization |
Other widths and lengths available on request |
CNPetro — Protecting pipelines. Advancing performance.
For product data sheets, ISO 21809-3/13 qualification certificates, or technical consultation, please contact our sales team.
Keywords: HDPP outer protective tape, outerwrap tape, 3LPE repair, ISO 21809-3/13, mechanical protection tape, UV-resistant outerwrap, pipeline coating restoration, polyethylene-backed sealant tape
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