Silicone Rubber Extruder Manufacturer India — MI-SE-EXT Series
Modern Industries Silicone Rubber Extruder — 6 models from 45mm to 200mm screw diameter. L/D ratio 10:1 to 12:1. All product-contact surfaces in SS304/SS316 stainless steel. PID-controlled temperature zones. Low-shear screw design for HTV and RTV silicone processing. Medical tubing, food-grade seals, automotive silicone hose, and precision silicone profiles.
What is a Silicone Rubber Extruder?
A silicone rubber extruder is designed specifically for processing HTV (High Temperature Vulcanising) and RTV (Room Temperature Vulcanising) silicone rubber compounds. It differs fundamentally from standard rubber extruders in two critical ways: all surfaces that contact the silicone compound are stainless steel, and the screw uses a low-shear design to prevent polymer chain degradation.
Silicone compounds are highly sensitive to metal contamination from standard carbon or alloy steel. Even trace metal pickup from screw, barrel, or head surfaces can disqualify compound for medical, food-grade, or pharmaceutical applications. Modern Industries MI-SE-EXT extruders use SS304 or SS316 stainless steel for all product-contact components — eliminating contamination risk and meeting regulated application requirements.
✓ MI-SE-EXT Series — Key Technical Highlights
Full Stainless Steel Contact Surfaces: Screw, barrel, and head all SS304/SS316 — prevents metal contamination. Essential for medical, pharma, and food-grade applications.
Low-Shear Screw Design: Prevents silicone polymer chain degradation and premature crosslinking — maintains compound properties through extrusion.
PID-Controlled Heating: Precision temperature control prevents scorching and premature vulcanisation of heat-sensitive silicone.
Mirror-Polished Flow Channels: Smooth flow, no compound hang-up, easy clean-out between compound changes.
L/D Ratio: 10:1 to 12:1 — balanced for silicone compound flow without excessive shear.
Drive: Precision AC motor + VFD — low-speed, high-torque for consistent silicone output.
MI-SE-EXT Series — Full Specification Table
All specifications verified from Modern Industries engineering data.
| Model | Screw Dia (mm) | L/D Ratio | Motor (HP) | Output (kg/hr) | Cooling (lpm) | Weight (kg) |
|---|---|---|---|---|---|---|
| MI-SE- EXT-45 | 45 | 10:1 | 5 | 30-40 | 5 | 600 |
| MI-SE- EXT-55 | 55 | 10:1 | 7.5 | 40-45 | 10 | 750 |
| MI-SE- EXT-75 | 75 | 10:1 | 20 | 65-70 | 20 | 1,200 |
| MI-SE- EXT-100 | 100 | 12:1 | 30 | 125-150 | 40 | 1,800 |
| MI-SE- EXT-150 | 150 | 12:1 | 100 | 300-400 | 75 | 4,000 |
| MI-SE- EXT-200 | 200 | 12:1 | 200 | 500-750 | 150 | 8,500 |
Stainless Steel Construction — Why It Matters
All product-contact surfaces are stainless steel. This is not optional for compliant silicone applications:
| Component | Material | Why Stainless Steel is Required |
|---|---|---|
| Screw | Hardened SS304/SS316 (polished) | Alloy steel releases iron ions under mechanical friction. Metal contamination disqualifies medical, pharma, and food-grade compound. |
| Barrel | SS304/SS316 with smooth finish | Prevents compound adhesion, enables clean-out, eliminates metal pickup at barrel wall. |
| Head | SS304/SS316 mirror-polished | Final contact point before die. Mirror polish prevents compound hang-up and ensures smooth extrudate surface finish. |
| Die (optional) | SS316 recommended | SS316 provides corrosion resistance for steam-cleaning and autoclave sterilisation cycles on medical tooling. |
Temperature Zones — MI-SE-EXT Series
Silicone extruders use 3–6 precision-controlled zones with PID controllers. Precise control is critical — silicone begins to crosslink prematurely if barrel temperatures deviate above the compound scorch threshold.
| Zone | Location | Control | Function |
|---|---|---|---|
| Zone 1 | Feeding Zone | PID | Controls compound intake — prevents scorch at feed throat |
| Zone 2 | Extrusion Zone | PID | Primary conveying and shaping zone |
| Zone 3+ | Additional Extrusion Zones | PID | Present on 75mm+ models — compound conditioning |
| Zone 4 | Die Head Zone | PID | Precise temperature at die entry — surface finish control |
| Zone 5 | Screw | Water-cooled | Internal screw cooling — prevents heat build-up in screw core |
Applications
Medical Tubing & Catheters
Medical-grade silicone tubing — catheters, peristaltic pump tubing, fluid transfer lines, drainage tubing. MI-SE-EXT-45 and MI-SE-EXT-55 for small-diameter medical tubing. SS316 screw and barrel, polished flow channels, PID control ensure compound purity and dimensional consistency to medical tolerance.
Food-Grade Seals & Gaskets
Food-grade silicone seals for processing equipment, baking moulds, gaskets for dairy and beverage lines, oven door seals. SS316 contact surfaces for steam-cleaning resistance, and compound certified free from metal contamination.
Automotive Silicone Hose & Profiles
High-temperature automotive silicone hose — turbocharger intercooler hose, coolant hose, radiator hose — and door seal profiles. VMQ silicone offers heat resistance to 200°C+ that EPDM cannot match. MI-SE-EXT-75 to MI-SE-EXT-150 for automotive silicone hose extrusion.
Electrical Insulation & Cable
Silicone-insulated cables for high-temperature industrial and automotive wiring. MI-SE-EXT-55 to MI-SE-EXT-100 range. Silicone insulation maintains flexibility and electrical properties at extreme temperatures where EPDM or PVC insulation fails.
Transparent Silicone Profiles
Transparent and semi-transparent silicone profiles for medical devices, architectural glazing, and industrial inspection windows. Transparency requires void-free, contamination-free compound — achievable only with stainless steel extrusion surfaces and PID temperature control.
Compatible Silicone Rubber Types
| Silicone Type | Grade | Applications |
|---|---|---|
| HTV Silicone (VMQ) | Standard heat-curing | Automotive hose, industrial seals, cable insulation, standard profiles |
| HTV Silicone (VMQ) | Medical-grade | Medical tubing, catheters, implantable components |
| HTV Silicone (VMQ) | Food-grade | Baking moulds, food processing seals, dairy gaskets |
| RTV Silicone | Extrudable grades | Low-temperature cure applications, specialised seals |
| Fluorosilicone (FVMQ) | Chemical-resistant | Fuel system seals, chemical-resistant profiles |
| LSR (Liquid Silicone) | With suitable die design | Consult engineering team on die requirements |
Frequently Asked Questions
Why does a silicone extruder need stainless steel surfaces?
Silicone rubber reacts with carbon steel and alloy steel under processing conditions — releasing iron particles into the compound through mechanical friction. Even trace metal contamination disqualifies silicone compound for medical, pharmaceutical, and food-grade applications. SS304 or SS316 is chemically inert to silicone and prevents metal pickup. Modern Industries MI-SE-EXT extruders use stainless steel for all product-contact components.
What temperature is used for silicone rubber extrusion?
Processing temperature for silicone rubber extrusion typically ranges from 80°C to 150°C depending on compound grade and vulcanisation system. HTV silicone for medical or automotive applications generally runs at 80°C–120°C in the barrel zones. Modern Industries MI-SE-EXT extruders use PID controllers maintaining temperature within plus or minus 1 degree C — preventing compound scorch.
What is the difference between HTV and RTV silicone?
HTV (High Temperature Vulcanising) silicone cures at elevated temperature — typically in a hot air oven or salt bath after die exit. It is the most common silicone compound for extruded profiles, tubing, and hose. RTV (Room Temperature Vulcanising) silicone cures at ambient temperature through moisture or catalyst reaction. MI-SE-EXT extruders are designed primarily for HTV silicone and extrudable RTV grades.
Which MI-SE-EXT model is best for medical tubing?
Medical silicone tubing is typically produced on MI-SE-EXT-45 or MI-SE-EXT-55 — 45mm or 55mm screw, 10:1 L/D, 5–7.5 HP. These combine low output with precise temperature control, critical for thin-wall tubing consistency. Contact our team with tube OD, wall thickness, and output requirement for specific model and die configuration guidance.
Can the silicone extruder process fluorosilicone (FVMQ)?
Yes. Fluorosilicone (FVMQ) — used for fuel system seals and chemical-resistant applications — can be processed on the MI-SE-EXT series. SS316 screw and barrel is recommended for FVMQ. Contact our engineering team with your compound specification for processing guidance.
