★ Capability 08 / 08

Rubber &
Silicone Molding.

Compression and injection molded rubber components from India — gaskets, seals, O-rings, diaphragms, custom parts. NBR, EPDM, FKM, silicone, natural rubber. FDA and USP Class VI compliant suppliers for medical, food, automotive, and industrial OEMs.

Get a Rubber Quote →View Specs ↓

★ Elastomer Mold

90 Sh A

Hardness

5kg

Max Wt

35+

Plants

★ Overview

Sealing, damping,
protecting.

India has one of the world's largest rubber goods industries — both as a leading natural rubber producer (Kerala, Tamil Nadu) and as a major exporter of compounded rubber components. Magnus partners with 35+ specialized rubber and silicone molding plants.

Typical Magnus rubber output: O-rings, gaskets, oil seals, diaphragms, anti-vibration mounts, grommets, bellows, silicone keypads, food-grade tubing, medical-grade silicone parts. From 10,000-piece annual programmes to 10+ million-piece runs for automotive Tier-1s.

At a Glance

ProcessesComp / Trans / Injection

Hardness range20 – 90 Shore A

Part weight0.1g – 5 kg

Tolerance±0.05mm

Volume10k – 10M+

Magnus suppliers35+ plants

★ Specifications

Rubber molding
capability matrix.

Parameter	Specification
Molding processes	Compression molding, transfer molding, liquid silicone (LSR) injection, solid silicone injection, rubber-to-metal bonding
Part weight	0.1 grams (O-rings) to 5 kilograms (large gaskets, anti-vibration mounts)
Hardness range	20 Shore A (soft) to 90 Shore A (hard); some grades reach 70 Shore D
Standard elastomers	NBR (Nitrile)EPDMSBRNaturalNeoprene (CR)Butyl
High-performance	FKM (Viton)FFKM (Kalrez)SiliconeFluorosiliconeHNBRAFLAS
Specialty grades	FDA food-contact, USP Class VI medical, NSF water, peroxide-cured (no sulphur), conductive rubber, EMI shielding
Bonding	Rubber-to-metal bonding (Chemosil systems), rubber-to-plastic over-molding, fabric-reinforced rubber
Quality	ISO 9001:2015, IATF 16949 (automotive O-rings/seals), ISO 13485 (medical silicone), FDA 21 CFR 177.2600, USP Class VI

★ Applications

Where rubber
does the sealing.

Sealing

O-rings, gaskets, oil seals, lip seals for fluid containment.

O-rings (all sizes)
Static & dynamic gaskets
Oil seals (TC, TB)
Quad seals & x-rings

Automotive

Engine, transmission, suspension rubber components.

Engine mounts
Bushings & isolators
Hose grommets
Anti-vibration pads

Medical & Food

FDA, USP Class VI silicone for medical and food-grade applications.

Silicone tubing
Diaphragm pumps
Surgical gaskets
Beverage seals

★ Quality Assurance

Rubber QC
protocol.

Compound In

Rheology test (cure curve), hardness, viscosity, specific gravity verified per batch before molding.

Tool Validation

FAI on first cure run: dimensional, flash, bonding (for metal-bonded parts), visual standards.

In-Process

Cure time / temperature / pressure logged. Hardness, dimensional sampled every shift.

Final Test

100% visual on critical parts, AQL sampling on dimensional, tensile, compression set, ageing tests as spec.

★ Frequently Asked

Rubber & silicone
FAQs.

What's the difference between compression and injection molding for rubber?

Compression molding (CM) places a pre-formed rubber blank in a heated cavity and compresses it — slow, lower tooling cost, ideal for low-volume and very large parts. Transfer molding (TM) is between CM and injection. Injection molding (IM) is fast, high-volume, automated, with tighter tolerances — ideal for parts above 50k pieces/year. For silicone, Liquid Silicone Rubber (LSR) injection is the highest-volume process with shortest cycle times.

How do you choose the right elastomer for my application?

Magnus's material selection considers (1) operating temperature range, (2) chemical exposure (oils, fuels, acids, solvents), (3) hardness requirement, (4) compression set tolerance, (5) regulatory compliance (FDA, ROHS, REACH), and (6) cost. We provide DFM consultation including material recommendations before tooling — typical lead time 5-7 days from spec submission.

What about FKM/Viton suppliers in India?

Yes, multiple Magnus suppliers handle FKM (Viton equivalent) for high-temperature fluid resistance. FKM types A, B, F, ETP available with hardness 65-90 Shore A. Common applications: turbocharger seals, fuel system O-rings, oil & gas seals. Note: FKM is significantly more expensive than NBR (~6-10x material cost) — make sure your application truly needs it.

How does India compare to China for rubber molding?

India is the world's third-largest rubber producer and has cost advantages in NBR, EPDM, and natural rubber components — typically 8-15% cheaper than China on landed cost. For silicone, the gap narrows (India 3-8% cheaper) since silicone raw material costs are global. India's automotive rubber industry (Tier-1 suppliers to Maruti, Tata, M&M) is comparable to Chinese quality at significantly lower cost.

Rubber &Silicone Molding.

Sealing, damping,protecting.