Introduction

WM3F is produced by unique process in which carbon black is pre-dispersed, then compounded with the basic resin through plastication. It is widely used in water supply pipe,drip irrigation pipe,corrugated pipe and film blowing applications. Suitable for PP and PE materials. It features low dosage, high blackness, good brightness, excellent heat resistance, outstanding dispersibility and tinting power, minimal impact on the physical properties of the final product.

Technical Parameter 

Pre-dispersed carbon black, engineered for single-screw pipe extruders

Pipe producution lines are single-screw extruders with short residence time and limited mixing intensity. Carbon black remains in colloidal form even when molten,

so how wellit was dispersed before it reached your hopper largely determines what happened at the die.

The carbon black of WM3F is pre-dispersed and  compounded with the carrier resin by plastication,

which is why the grade provide high blackness and strong tinting power at low dosage rather than relying on your screw to finish the job.

Moisture stay at ≤0.15%

Water vapor in masterbatch flashes to steam inside the extruder barrel. The result is micro-voids, pinholes and silver streaks in the pipe wall , defects sitting directly in the load path of the pressurized pipe.

WM3F keep <0.15% moisture in the sealed 25 kg bags, well below the <0.50% ceiling commonly quoted on pipe grade datasheets. Under normal storage no pre-drying is required.

One grade across pipe, drip tape, corrugated pipe and blown film

WM3F is compatible with both PE and PP, so a converter running water supply pipe, drip irrigation tape, corrugated pipe and blown film can hold with the single grade in stock and adjust dosage per product instead of changing material.

Why WM3F Is Specified for Water Supply Pipe ?

Dispersion is specified as a number, not an adjective,  masterbatch can look perfectly black and still fail in pressure pipe. The parameter that decides whether carbon black

protects the pipe wall or damages it is dispersion. WM3F is specified at ≤Level 2.5 on the ISO 18553 scale , inside the≤ grade 3 limit that ISO 4427 and EN 12201 set for black PE compounds.

Undispersed carbon black agglomerates act as stress concentration points that can initiate slow crack growth under sustained internal pressure, so we publish the

measured grade instead of describing dispersion as "good" only, you can read more from our technical guide about water supply pipe

Dosage and Carbon Black Content in the Finished Pipe

ISO 4427 and EN 12201 require black PE water pipe compounds to contain 2.0-2.5% carbon black by mass, tested to ISO 6964, with a dispersion grade of 3 or better.

ISO 8779 applies the same carbon black window to PE irrigation pipe. How much WM3F you need depends on how much carbon black your base resin already carries.

Calculating at 45% carbon black, the nominal mid point of the 44-46.5% specification.

Read together: across the 1.0-4.0% extrusion dosage range WM3F provides coloring and partial UV protection , the right level when the base resin already supplies part of the carbon black load.

Where a natural, carbon-black-free base resin must reach the 2.0-2.5% specification, WM3F is added at approximately 4.5-5.6%.

Two points worth keeping in mind. Carbon black above roughly 3% by mass brings no further UV benefit and raises the risk of agglomeration and loss of impact strength, more masterbatch is not more protection.

And oxidation induction time (OIT, ISO 11357-6) is governed mainly by the antioxidant package in your base compound rather than by the masterbatch itself.

Send us your base resin grade and datasheet, also the standard you are working to, we will calculate the exact addition rate for your line. 

How Carbon Black Protects PE Pipe Wall from UV Degradation

1st : UV absorption

Carbon black absorbs UV-A and UV-B radiation across the 280-400 nm band and dissipates the energy as heat. Intercepting photons before they reach the polymer chain prevents the free-radical chain scission

that causes surfacechalking, embrittlement and loss of elongation.

2nd : Radical scavenging

Surface functional groupson the carbon black particles intercept free radicals that form below the fully shielded outer layer, extending protection into the sub-surface zone rather than relying on a single absorbing

skin.

3rd : Thermal buffering

Pipe stored outdoors in direct sun reaches surface temperatures far above ambient. Carbon black's thermal absorption and radical scavenging moderate photo-oxidative and thermal degradation at the same time,

which matters during the weeks or months a pipe spends in open storage before installation.

Note that buried pipe still spends a long period above ground before backfilling, so UV shielding is specified for the whole service life rather than only for the exposed sections.

ProcessingWM3F in Pipe Extrusion

Compliance, Quality and Supply

WM3F is RoHS, REACH and PAHs compliant black masterbatch. Technical data sheet, safety data sheet, batch test data and compliance declarations are issued with your order as request.

Jolink has manufacturing carbon black masterbatch for over 30 years from a 20,000 m² facility with 30,000 tonnes of annual capacity,

exporting to more than 20 countries.The product range is covered by 40+ patents.

WM3F is classified under HS code 32064990.00.

FAQ — Black Masterbatch for Water Supply Pipe

How much WM3F is needed to reach 2.0–2.5% carbon black in the HDPE water pipe?

At 45% carbon black content, WM3F is added at approximately 4.5–5.6% when the base resin contains no carbon black of its own.

If your PE 80 or PE 100 base compound is already partly black, deduct its carbon black contribution first.

Send us the base resin data sheet and the standard you are working to — ISO 4427, EN 12201, ISO 8779 or a national equivalent , we will return the exact addition rate.

Does WM3F meet the dispersion requirement of ISO 4427 and EN 12201?

Both standards require black PE compounds to reach dispersion grade of 3 or better on the ISO 18553 scale, where lower number means better dispersion.

WM3F is specified at ≤ Level 2.5.

Note that these requirements apply to the finished compound, so dispersion should also be verified on your extruded pipe through your own routine testing.

We supply masterbatch dispersion data to support your incoming inspection.

Can WM3F be used for PP pipe and drip irrigation tape as well as HDPE?

Yes but need to test by your own equipment.

WM3F is compatible with PE and PP and is used in water supply pipe, drip irrigation tape, corrugated pipe and blown film.

Recommended dosage in blown film is 4.0–8.0%; in pipe and profile extrusion 1.0–4.0%, adjusted to your carbon black target.

The data sheet quotes melt flow index at 190 °C / 10 kg. How should I read that figure?

Melt flow index is only comparable at the same temperature and load.

WM3F is quoted under ISO 1133 Condition F (190 °C / 10 kg).

A figure measured at 190 °C / 21.6 kg (Condition G) or 190 °C / 2.16 kg (Condition D) will be very different for the same polymer,

because the higher load drives faster flow. Always confirm the test condition before comparing grades.

If your incoming inspection uses different condition, tell us which one and we will supply the matching test data.

Do you accept OEM orders and custom specifications?

Yes. Carbon black content, carrier resin and additive package are set per grade.

Tell us your target pipe grade and the standard you are working to, and we will confirm what is available. OEM and private-label packaging are accepted.

Packing and Storage 

25kg/bag, PE or Composite Paper bag

Stored under dry, enclosed and cool conditions, protected from UV rays and/or direct sunlight. After used, the opened packaging must be resealed properly to prevent the product from absorbing moisture, which could affect its performance.

Note 

The technical results are typical values and are provided for customer reference only. They are not to be regarded as a guarantee of minimum or maximum quality specifications.