Introduction

WM2A is produced by high-pigment carbon black with AS as carrier and special dispersion agent. Its carbon black is stable and blue-shape grade. Suitable for ABS PC high glossy injection materials, also PPO PPS PA PET etc. thermoplastic It features good brightness, excellent heat resistance, outstanding tinting power.

Why the carrier matters more than the carbon black 

Adding the black masterbatch carried on polyethylene.

Polyethylene is not miscible with SAN,  even at 2% letdown,  you are introducing an immiscible polymer phase into a system that was formulated as a whole.

The problems are not dramatic, which is exactly why they are expensive. Localised dulling of the moulded surface. A grey-blue haze that appears under raking light , but not under direct light

The measurable loss of impact strength around the rubber phase, precisely where the part is expected to absorb energy. 

In a matte part with a generous colour tolerance you may never notice any of it. In a piano-black bezel inspected with a gloss meter.

WM2A solved the problem at the source. Its AS (SAN) carrier is the ABS basic frame, so there is no foreign polymer to appear. 

In PC/ABS blends , where most home appliance and interior injection parts actually live , SAN is partly miscible with polycarbonate at injection temperatures,

so the same logic holds across both phases of the blend.

Technical Parameter 

Where WM2A is specified 

WM2A wins its place in part that are inspected, where the colour deviation or  dull patch is  rejection , not compromise 

General end uses including appliance shell cases and bezels, power-tool and electronics housings, cosmetic and personal-care packaging, and any visible components

where the blue-shade black has been specified as gloss target.

Processing Guidance 

Starting at 2%.

For a high-gloss ABS part, run 2% first, mould a plaque, then read the gloss and the colour before you move up or down inside the 1.0-3.0% window.

Dry the base resin, not the masterbatch.

WM2A is delivered at <0.5% moisture, which limits the water adds to the melt

it does not replace drying your ABS or PC.

Dry-blend at low or high speed.

WM2A is designed to mix uniformly with the base resin and to resist segregation during conveying and feeding.

Take advantage of the thermal window.

The carrier and pigment system are selected to hold colour at the melt temperatures used for ABS and PC through to PPO, PPS, PA and PET.

Reseal opened bags.

Store dry, enclosed and cool, away from UV and direct sunlight.

Frequently Asked Questions 

Does  black masterbatch for ABS us really need SAN carrier ?

For matte parts with loose colour tolerance, PE carrier can be good enough.

For high-gloss and visible surfaces, no. Polyethylene is not miscible with SAN, so it forms a separate phase inside the ABS.

The masterbatch colour may still be black, but the surface finish, the weld-line colour and the impact strength around the rubber particles stop behaving the way the base resin was designed to behave.

What does “structure-enhanced” mean in practice use?

It describes how the grade interacts with the mechanical structure of the finished part rather than with its colour.

Because the carrier is the frame copolymer and the carbon black is delivered through dedicated dispersion package,

the black is present as a well-dispersed phase rather than as agglomerates or as a second polymer.

Reported impact strength for WM2A is 20.95 kJ/m3 , practical indication that adding black does not mean giving up toughness.

How do I avoid silver streaks and splay marks in the high-gloss black parts ?

Two points : moisture and dispersion quality.

Moisture turns to steam at the gate and leaves silver streaks across the flow path; undispersed carbon black agglomerates show up as specks and as local dulling.

WM2A addresses both — moisture ≤0.5% on the pellet, and  dispersion package matched to 37% carbon black loading.

Keep the base resin dry and you have removed the main cause.

The MFI is 10 ± 5 g/10 min. Is that suitable for thin-wall or long-flow parts?

MFI is a useful indicator but poor predictor on its own,  flow in the mould is dominated by the base resin, the wall thickness and the flow-length-to-thickness ratio.

WM2A at 10 ± 5 g/10 min (220 °C / 5 kg) is moderate-flow grade matched to standard ABS, PC and PC/ABS injection and to compounding.

For wall sections below roughly 1.5 mm or very long flow paths, we recommend sample trial in your own equipments,  send us the shape and we will advise.https://www.jolink-masterbatches.com/contact-us

Can WM2A be used in PPO, PPS, PA and PET ?

Yes , these thermoplastics are listed applications for this grade.

They are processed at higher melt temperatures than ABS, which is why the carrier and pigment system were chosen for thermal stability.

Use 1.0–3.0% for injection and 2.0–4.0% for compounding, and confirm with trial on your own resin, since each resin family has its own compatibility profile.

What documentation is supplied with an order ?

Technical data sheet for the grade, certificate of analysis for the delivered batch, and compliance declarations for RoHS, REACH, PAHs and FDA on request.

OEM colour matching 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.