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3-Ply Tape Coating System EN 12068 C50

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EN 12068 CLASS C50 · COLD APPLIED

3-Ply Tape Coating System EN 12068 C50

A high-performance cold applied system – asymmetric 3-ply inner tape plus outer mechanical tape – for EN 12068 Class C50 corrosion protection.

EN 12068 Class C50Standard18 J at 23 °CImpact resistance3-ply · 0,80 mmInner tape
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3-ply EN 12068 C50 tape coating system on a pipe field joint – YTM Makina

What is the 3-Ply Tape Coating System EN 12068 C50?

The YTM Makina 3-Ply Tape Coating System consists of YTM Primer, an asymmetric 3-ply black corrosion protection (inner) tape (0,80 mm) and a white 0,80 mm mechanical protection (outer) tape, both with PE backing and butyl rubber adhesive.

Complying with EN 12068 Class C50 (formerly DIN 30672), it delivers high adhesion to steel and mill coatings, 18 J impact resistance and low cathodic disbondment – ideal for gas and water pipeline field joints and fittings.

Key features and benefits

  • EN 12068 Class C50 (formerly DIN 30672)
  • Asymmetric 3-ply inner tape, 0,80 mm
  • Impact resistance 18 J at 23 °C
  • Adherence to steel 0,9 N/mm at 23 °C
  • Compatible with PE, EP, PP, PU, FBE and CTE coatings
  • UV resistant · cold applied

Applications

  • Buried steel pipelines (new construction)
  • Submarine and submerged pipelines
  • Field joints and girth welds
  • Reconditioning / rehabilitation of existing metallic pipes
  • Site or mill application – by hand or with a wrapping machine

Industries served

  • Water transmission and distribution
  • Oil and gas pipelines
  • Industrial and process plants
  • Municipal infrastructure and utilities

Why choose a cold applied tape system?

  • No open flame, torch or heating equipment on site – safer around live lines and in confined trenches.
  • Simple tools: primer brush, knife and an optional manual wrapping machine.
  • No curing time for the tapes – the joint can be inspected and lowered in as soon as wrapping is complete.
  • Polymeric PE/butyl tapes give a higher quality level than bituminous coatings.
  • Same system for field joints, fittings, bends and full-length pipe coating.

Inspection and quality control

  • Check that the overlap is uniform and that there are no wrinkles, air pockets or lifted edges.
  • Holiday-test the finished coating with a holiday (spark) detector at the test voltage required by the project specification.
  • Repair any defect by cleaning, priming and over-wrapping the area with a patch of tape.
  • The system is resistant to cathodic disbondment and can be used together with cathodic protection.

Storage and handling

  • Store cartons dry and covered, away from direct sunlight and heat sources; keep rolls in their cartons until use.
  • Keep primer cans tightly closed and away from ignition sources (see the YTM Primer data sheet).
  • In cold weather keep tapes in a warm place before use for easier unrolling and better conformability.

Technical data

PropertyUnitInner tape (3-ply, black)Outer tape (white)
Thickness (inner / backing / outer layer)mm0,34 / 0,30 / 0,160,17 / 0,63 / –
Elongation at break%650≥ 400
Tensile strengthN/cm12050,8
Dielectric strengthkV/mm3545,2
Fragility temperature°C−46 ± 4−46 ± 5
Water absorption%0,1 max.< 0,07

System properties

System propertyUnitValueTest method
Adherence to steel (23 / 50 °C)N/mm0,9 / 0,09EN 12068 Annex C
Adherence to PE mill coating (23 / 50 °C)N/mm0,8 / 0,1EN 12068
Tape-to-tape adhesion at 23 °CN/mm2,5 – 2,7EN 12068 Annex B
Impact resistance at 23 °CJ18EN 12068
Cathodic disbondment (23 / 50 °C)mm r7 / 27EN 12068
Insulation resistanceΩ·m²1 × 10⁸EN 12068

Values are typical. Full data in the Technical Data Sheet Download the technical data sheet.

Surface preparation

  • Surfaces must be dry and free from dirt; solvent-wipe with a clean cloth to remove grease.
  • Power wire-brush to remove scale, loose rust and flaking coatings to St 2 (ISO 8501-1); for refurbishment of old pipe, abrasive blast cleaning to Sa 2½ is preferred.

How to apply

  1. Prepare the surfaceClean, dry and wire-brush (St 2) or blast-clean (Sa 2½) the steel to ISO 8501-1.
  2. PrimeApply a thin coat of YTM Primer by brush or roller over the whole area to be wrapped and let it become tacky.
  3. Wrap the inner tapeStart at the 9 o'clock position, peel back the interleaving and wrap spirally with 2–5 % tension and 55 % overlap (double layer).
  4. Wrap the outer tapeUse the same width, start and finish 25 mm beyond the inner tape on primed pipe, compound side down, with 25 mm (3-layer) or 55 % (4-layer) overlap.

Supply and packaging

Inner tape 3-ply 0,80 mm50 / 100 / 150 mm × 30 m · 12 / 6 / 4 rolls per carton
Outer tape 0,80 mm50 / 100 / 150 mm × 30 m · 12 / 6 / 4 rolls per carton

Frequently asked questions

What does EN 12068 Class C50 mean?

EN 12068 classifies external tape coatings by mechanical stress class (A, B, C) and maximum operating temperature. C50 is the highest mechanical class, rated for operation up to 50 °C.

What is a 3-ply tape?

A co-extruded tape with adhesive on both sides of the PE backing, giving excellent tape-to-tape adhesion in the overlap.

Is a primer required?

Yes. The system is applied over YTM Primer, a liquid butyl rubber adhesive that bonds the inner tape to the steel. Apply the tape while the primer is still tacky.

Can the tapes be applied by machine?

Yes. The system can be applied by hand or with the YTM Manual Tape Wrapping Machine, which keeps constant tension and a uniform overlap.

Which existing coatings is it compatible with?

The tapes are compatible with PE, PP, PU, FBE and coal-tar (CTE) coatings, so field joints can overlap the factory coating.

How is the finished coating inspected?

Visually for uniform overlap and no wrinkles, then with a holiday (spark) detector at the voltage required by the project specification.

Is the system compatible with cathodic protection?

Yes. The tapes are resistant to cathodic disbondment and are used on cathodically protected pipelines.

Need 3-Ply Tape Coating System EN 12068 C50 for your project?

Contact YTM Makina for technical support, project-specific requirements and a quotation – [email protected] · +90 542 306 40 43.

Request a quote