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Six numbers that determine whether your PE water supply pipe will last long-term — or fail in short-term.

When we talk about black masterbatch for potable water pipes, we’re not talking about color. We’re talking about UV protection, mechanical integrity, and decades of service life. Here are the six mandatory physicochemical indicators every batch must meet:
1️⃣ Carbon Black Content: 44–46% (GB/T 13021)
At 5% dosing, this delivers exactly 2.0–2.5% carbon black in the finished pipe — the minimum threshold for UV protection per ISO 4427.
2️⃣ Carbon Black Dispersion: ≤ Grade 3 (GB/T 18251)
No agglomerates >60μm. No fish eyes. No streaks. Poor dispersion = stress concentration points = premature slow crack growth failure.
3️⃣ Ash Content: ≤ 0.30% (GB/T 9345.1)
Inorganic impurities destroy pipe toughness and inner wall smoothness. Above 0.30% = non-compliant, no exceptions.
4️⃣ Moisture & Volatile: ≤ 350 ppm (0.035%)
Above this, you get bubbles, popping, and microvoids during extrusion. The pipe wall becomes porous before it even leaves the factory.
5️⃣ MFR (190°C/5kg): 1.0–10.0 g/10min (GB/T 3682.1)
Must match your base resin. Too far off = poor mixing, surging, carbon black streaks in the pipe wall.
6️⃣ OIT (210°C): ≥ 30 min (GB/T 19466.6)
This is your longterm used insurance policy. Below 30 min, the antioxidant system can’t survive processing — let alone decades in service.
These six numbers aren’t independent. They interact: high carbon loading makes dispersion harder; mineral fillers that raise ash also kill OIT; moisture during compounding ruins dispersion even if content is correct.
That’s why we engineered WM3F — a black masterbatch that meets all six indicators simultaneously, batch after batch, in production volumes.
If you’re specifying masterbatch for PE water supply pipe production, ask for the model WM3F — and ask for the test data.
When we talk about black masterbatch for potable water pipes, we’re not talking about color. We’re talking about UV protection, mechanical integrity, and decades of service life. Here are the six mandatory physicochemical indicators every batch must meet:
1️⃣ Carbon Black Content: 44–46% (GB/T 13021)
At 5% dosing, this delivers exactly 2.0–2.5% carbon black in the finished pipe — the minimum threshold for UV protection per ISO 4427.
2️⃣ Carbon Black Dispersion: ≤ Grade 3 (GB/T 18251)
No agglomerates >60μm. No fish eyes. No streaks. Poor dispersion = stress concentration points = premature slow crack growth failure.
3️⃣ Ash Content: ≤ 0.30% (GB/T 9345.1)
Inorganic impurities destroy pipe toughness and inner wall smoothness. Above 0.30% = non-compliant, no exceptions.
4️⃣ Moisture & Volatile: ≤ 350 ppm (0.035%)
Above this, you get bubbles, popping, and microvoids during extrusion. The pipe wall becomes porous before it even leaves the factory.
5️⃣ MFR (190°C/5kg): 1.0–10.0 g/10min (GB/T 3682.1)
Must match your base resin. Too far off = poor mixing, surging, carbon black streaks in the pipe wall.
6️⃣ OIT (210°C): ≥ 30 min (GB/T 19466.6)
This is your longterm used insurance policy. Below 30 min, the antioxidant system can’t survive processing — let alone decades in service.
These six numbers aren’t independent. They interact: high carbon loading makes dispersion harder; mineral fillers that raise ash also kill OIT; moisture during compounding ruins dispersion even if content is correct.
That’s why we engineered WM3F — a black masterbatch that meets all six indicators simultaneously, batch after batch, in production volumes.
If you’re specifying masterbatch for PE water supply pipe production, ask for the model WM3F — and ask for the test data.
生成黑色给水管道车间特写图.jpg