What is the recommended filler loading for potable water pressure pipes vs drainage pipes?

For potable water pressure pipes governed by KEBS KS-06, filler loading is strictly controlled between 5 and 10 phr (parts per hundred resin) to ensure the pipe passes long-term hydrostatic pressure burst testing. For non-pressure underground drainage and conduit pipes, loadings range from 20 to 45 phr to maximize ring stiffness and cost savings.

What particle size (mesh / micron) is required for PVC pipe extrusion fillers?

High-speed extrusion requires ultra-fine Ground Calcium Carbonate with a top cut (D98) under 10 microns and an average particle size (D50) between 1.5 and 2.5 microns (equivalent to 1250 to 2500 mesh). Coarser particles cause notch sensitivity and premature impact cracking.

How does calcium carbonate purity affect extruder screw and barrel wear?

Calcium carbonate must have low silica/acid-insoluble content (<0.2%). Silica and quartz impurities are highly abrasive mineral crystals that erode hardened extruder screws, barrel liners, and sizing dies, leading to premature tooling replacement costs.

Can coated calcium carbonate replace titanium dioxide in PVC pipe formulations?

Calcium carbonate provides high natural brightness (whiteness >95%) and opacity, allowing extruders to reduce expensive Titanium Dioxide (TiO2) loading by 20–30%. However, a baseline level of TiO2 is still required for exterior UV stabilization against sunlight degradation.

What mixing temperature is required to ensure optimal dispersion in turbo dry-blenders?

In a high-speed dry mixer, the PVC resin, stabilizer, and lubricants are heated by friction to 75–80°C before adding the coated calcium carbonate. The mixture is then sheared up to 105–115°C, ensuring the stearate coating melts and thoroughly coats all polymer surfaces before discharging into the cooler.

Heavy-duty plastic pipe corrugator extrusion die line producing corrugated drainage pipe in a plastics factory

Chemical application profile

PVC Pipe Extrusion Filler

Manufacturers of PVC pressure pipes, electrical conduit, corrugated ducting, and drainage fittings across Nairobi, Athi River, and Eldoret rely on micronized, surface-modified calcium carbonate fillers to optimize raw resin costs while boosting pipe stiffness, impact resistance, and extrusion line output. KIKI'S supplies ultra-pure, stearic-acid-coated Ground Calcium Carbonate (GCC) engineered for optimal barrel lubrication, smooth melt flow, and full KEBS KS-06 compliance.

Target SectorsAgricultural & Horticultural Chemicals Supplier in Kenya · Agricultural & Horticultural Chemicals Supplier in Kenya · Animal Feed & Livestock Chemicals Supplier in Kenya

Packaging25kg Bags · 200L Drums · IBC Tankers · Bulk Delivery

DocumentationBatch COA, TDS & SDS Available on Request

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TARGET SECTORS:

Agricultural & Horticultural Chemicals Supplier in Kenya Agricultural & Horticultural Chemicals Supplier in Kenya Animal Feed & Livestock Chemicals Supplier in Kenya Automotive & Fleet Chemical Raw Materials Supplier in Kenya

Quick Answer — PVC Pipe Extrusion Filler

For pvc pipe extrusion filler applications, KIKI'S Industrial Chemicals supplies documented industrial-grade raw materials and specialty formulation chemicals. We provide consistent chemical inputs and technical documentation to commercial operators across Kenya and the East African market.

A PVC pipe extrusion filler is a micronized, surface-modified mineral additive—predominantly calcium carbonate treated with fatty acids—incorporated into unplasticized PVC formulations to improve stiffness, dimensional stability, and production economics.

Key Facts

•Application: PVC Pipe Extrusion Filler
•Commercial Supply: Industrial chemical grades with full TDS and SDS documentation
•Regional Distribution: Dispatched from Nairobi to production plants across Kenya and East Africa
•Procurement Options: Commercial bags, drums, IBC totes, and scheduled delivery agreements

Primary Use Cases

Potable water uPVC pressure pipe manufacturing conforming to KEBS KS-06Underground sewer, soil, and rainwater drainage pipe extrusionRigid electrical conduit, trunking, and telecommunication ductingInjection molded PVC plumbing fittings and pressure pipe connectors

Technical Process

Surface Modification, Polymer Dispersion and Extruder Rheology

Unplasticized Polyvinyl Chloride (uPVC) is a rigid, notch-sensitive polymer with high melt viscosity that requires careful formulation with thermal stabilizers, lubricants, and mineral fillers. Untreated calcium carbonate particles possess high hydrophilic surface energy, making them aggregate and resist wetting in hydrophobic PVC melts. This leads to extruder screw wear, die build-up, and brittle spots in the finished pipe wall.

KIKI'S supplies ultra-fine Ground Calcium Carbonate (GCC) surface-treated with 1.0–1.2% Stearic Acid. The non-polar aliphatic tails of the stearate coating bond organically with PVC molecular chains, lowering melt viscosity and acting as an internal lubricant during twin-screw extrusion. This uniform particle dispersion reduces shear heating in the barrel, allows higher screw RPMs, and increases hourly production output without burning the heat-sensitive PVC resin.

Mechanical Modulus, Ring Stiffness, and KEBS KS-06 Compliance

In rigid drainage and sewer pipes, incorporating 20 to 40 phr (parts per hundred resin) of 2–5 micron coated GCC dramatically increases pipe ring stiffness (modulus of elasticity), allowing pipes to withstand earth backfill loads without ovalization. For potable water pressure pipes complying with Kenya Bureau of Standards (KEBS KS-06), precise loading (typically 5 to 10 phr) ensures pipes pass stringent long-term hydrostatic pressure burst tests and Charpy impact standards at 0°C.

Stearic-acid-coated ultrafine calcium carbonate filler for enhancing pipe stiffness, impact strength, and extrusion yield.

Standard Application Process

1
High-Speed Dry Blending
Charging PVC suspension resin (K67) into a high-speed turbo mixer and heating under frictional shear to 75–80°C.
2
Stabilizer & Lubricant Dosing
Adding One-Pack lead or calcium-zinc thermal stabilizers, internal lubricants, and processing aids to the hot resin mix.
3
Coated Calcium Carbonate Incorporation
Introducing stearic-acid-coated calcium carbonate filler at 100°C to ensure total deagglomeration and complete dispersion.
4
Cooling & Dry Blend Conditioning
Discharging hot mix into a jacketed horizontal cooling mixer at 40°C to release static electricity and prevent agglomeration.
5
Twin-Screw Extrusion & Pipe Sizing
Extruding plasticized dry blend through a vacuum calibrator and water spray bath to produce finished rigid PVC pipes.

Recommended Chemicals for PVC Pipe Extrusion Filler

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Paint & Coating Raw Materials

Calcined kaolin (Industrial Coating / Extender Grade)

Calcined kaolin supplied by KIKI'S Industrial Chemicals in 25kg bags for industrial, manufacturing, and commercial…

Used for: Extender Pigment Opacification · Decorative Paint Formulation · PVC Pipe Extrusion Filler

25Kg Bags (Origin: India)

CAS 92704-41-1 · Industrial Coating / Extender Grade · Powder

PVC Pipe Extrusion Filler

Quick Answer — PVC Pipe Extrusion Filler

Technical Process

Surface Modification, Polymer Dispersion and Extruder Rheology

Mechanical Modulus, Ring Stiffness, and KEBS KS-06 Compliance

Standard Application Process

Recommended Chemicals for PVC Pipe Extrusion Filler

Calcined kaolin (Industrial Coating / Extender Grade)

General Industrial Calcium Carbonate (Ground Limestone Powder)

Calcium Carbonate for Plastic & PVC Pipe Extrusion Manufacturing

Calcium carbonate PCC (Precipitated Industrial Grade (PCC))

HDPE BLOW 2035 BAPOLENE/ 5502 (Extrusion / Moulding Polymer Grade)

HDPE FILM F5H04 (OPALENE) (Extrusion / Moulding Polymer Grade)

HDPE INJ. BAPOLENE 3272 (20 MFI) : 25 KG (Extrusion / Moulding Polymer Grade)

HDPE INJECTION 2035 MFI 0.35 (Extrusion / Moulding Polymer Grade)

HDPE INJECTION 8MFI 65N8U (Extrusion / Moulding Polymer Grade)

HDPE INJECTION BAPOLENE 3255U 8 MFI (Extrusion / Moulding Polymer Grade)

HDPE PIPE HS CRP100- PE 100 (BLACK WAATER PIPEO (Extrusion / Moulding Polymer Grade)

LDPE film - 200F - (Extrusion / Moulding Polymer Grade)

LLDPE Roto T3804U MFI/MFR:4- (Extrusion / Moulding Polymer Grade)

LLDPE film (Opalene) F20015 - (Extrusion / Moulding Polymer Grade)

LLDPE injection 6201XR (Extrusion / Moulding Polymer Grade)

Lead Stabilizer Maxstab 24% (PVC Heat Stabilizer Grade)

Lead Stabilizer Maxstab20% (PVC Heat Stabilizer Grade)

Masterbatch - white 60% TiO2PE based PEW60 (Extrusion / Moulding Polymer Grade)

Masterbatch Deccicant moisture remover- (Extrusion / Moulding Polymer Grade)

PP Raffia 503 RES (Extrusion / Moulding Polymer Grade)

PROYLENE PP- NON WOVEN (Extrusion / Moulding Polymer Grade)

PVC COMPOUND (MB) (Extrusion / Moulding Polymer Grade)

PVC PE WAX (Extrusion / Moulding Polymer Grade)

PVC Resin 1000DS (Extrusion / Moulding Polymer Grade)

Key Performance Advantages

Key Industrial Use Cases

FAQs — PVC Pipe Extrusion Filler