Fillers & Chemicals

The chemistry that decides how a compound processes, how it cures, and how long it survives the road it was built for.

Silanes, accelerators, antioxidants, insoluble sulphur, resins and mould release. Small percentages of the mix that govern most of its behaviour.

The chemistry that makes rubber perform.

A compound is shaped as much by its chemistry as its elastomer base. Polyplas supplies a focused range of high-performance fillers and process chemicals, silanes, accelerators, antidegradants, insoluble sulphur, resins and release systems, from principals including Shanxi and Rayton.

Polyplas supplies rubber chemicals for tyre manufacturing in India: silane coupling agents (Si-69, Si-75, X-50S and NXT-type mercaptosilanes), sulphenamide accelerators (TBBS, CBS, MOR), antioxidants and antiozonants (6PPD, TMQ), oil-coated insoluble sulphur, C5/C9 hydrocarbon resins, and water-based tyre mould release systems.

Silica will not bond to rubber on its own.

It reinforces better than carbon black and it lowers rolling resistance, but without a coupling agent it sits in the compound instead of joining it. The silane is what makes the fuel-efficient tread possible at all.

The problem

Silica reinforces better than carbon black and lowers rolling resistance. On its own it will not bond to rubber. The filler sits in the compound instead of joining it.

What we carry, and
what it is for.

Chapter one · coupling chemistry

Silane Coupling Agents

The highest-value chemistry in the portfolio, and the fastest-growing.

Silica does not bond to rubber on its own. Silanes are the molecular bridge, without them, the green-tyre formulations behind low rolling resistance simply do not work.

Polyplas supplies the classic bifunctional grades and advanced mercaptosilanes with better scorch safety and processing behaviour. This is the highest-value chemistry in the portfolio, and the fastest-growing.

Grades carried

X-50S · Si-266 · Si-69 (TESPT) · Si-75 (TESPD) · NXT-type mercaptosilanes

Where it lands

Silica-filled green-tyre tread compounds · rubber-to-filler bonding

Silica · silane · rubber coupling

Without a silane, silica cannot bond to the polymer. Green-tyre tread chemistry starts here.

Effect on silica-filled tread

Rolling resistance

Significant reduction

Wet traction

Retained · improved

Abrasion loss

Controlled

Scorch safety (NXT)

vs. TESPT baseline

Typical applications

Green-tyre tread
SSBR · silica
TBR fuel-efficient
Silica + carbon black
Speciality goods
Silica-reinforced

Grade family

Si-69 (TESPT)	Standard bifunctional silane
Si-75 (TESPD)	Lower sulphur · better scorch
X-50S	50% silane on carbon black carrier
NXT-type	Mercaptosilane · low VOC
Form	Liquid · pastille · supported

Chapter two · cure control

Rubber Accelerators

Where scorch ends and cure begins is written in this ingredient.

Accelerator choice decides cure rate, scorch safety and crosslink density, and with them, the mechanical character of the finished tyre. Polyplas supplies the primary sulphenamides used across the Indian industry, from internationally certified chemical producers.

Grades carried

TBBS (NS) · CBS (CZ) · MOR, sulphenamide and thiazole types

Where it lands

Vulcanisation control in every tyre and rubber compound

Torque · time · vulcanisation

Sulphenamide accelerators (TBBS, CBS, MOR) tune where scorch ends and cure begins.

Sulphenamide comparison · indicative

TBBS · scorch

TBBS · cure rate

CBS · scorch

CBS · cure rate

MOR · flat cure

Typical applications

Tread compounds
Primary accelerator
Body ply · sidewall
Balanced systems
Skim (with IS)
Steel-cord adhesion

Grade family

TBBS (NS)	N-tert-butyl-2-benzothiazole sulphenamide
CBS (CZ)	N-cyclohexyl-2-benzothiazole sulphenamide
MOR	N-morpholino sulphenamide, delayed action
Form	Powder · oiled powder · granular
Purity	≥ 96%, low free amine

Chapter three · protection chemistry

Antioxidants & Antiozonants

Unprotected rubber cracks, hardens and fails. Antidegradants are non-negotiable in every compound, most of all in the sidewall, where the surface faces the weather for the life of the tyre.

Grades carried

6PPD (IPPD) · TDQ (TMQ)

Where it lands

Sidewall and tread protection against ozone, oxygen, heat ageing

Ozone attack · unprotected vs 6PPD

Antiozonants migrate to the surface faster than ozone can crack the chain.

Representative properties

6PPD (IPPD)	Antiozonant · dark staining
TMQ (TDQ)	Antioxidant, polymerised
Melting point (6PPD)	45–50 °C
Assay	≥ 96%
Form	Pastille · flake · powder

Function emphasis

Ozone protection

Heat ageing

Flex-crack resistance

Staining tendency

6PPD stains

Chapter four · cure system

Insoluble Sulphur

Ordinary sulphur blooms to the compound surface and destroys cord adhesion. Insoluble sulphur stays put at processing temperature, which is why every radial skim compound depends on it. Polyplas supplies oil-coated grades from internationally recognised producers.

Grades carried

IS-60 HS · IS-65 HS · IS-7020, oil-coated grades

Where it lands

Skim and body-ply compounds in radials · steel cord adhesion

Insoluble S∞ vs rhombic S₈

Polymeric sulphur stays dispersed; rhombic S₈ blooms to the surface between the mixer and the press.

Representative properties

IS-60 HS	Oil-coated 20% · standard
IS-65 HS	Oil-coated 20% · high stability
IS-7020	Oil-coated 20% · thermal stable
Insolubility	≥ 60% at 105 °C, 15 min
Form	Free-flowing powder

Function emphasis

Bloom resistance

Skim cord adhesion

Thermal stability

Chapter five · tackifiers

Hydrocarbon Resins

Uncured plies must hold together before the press does its work. Tackifying resins provide that building tack. Polyplas supplies aliphatic, aromatic and copolymer grades, including from Rayton of China, matched to each customer's compound and process.

Grades carried

C5 aliphatic · C9 aromatic · C5/C9 copolymer

Where it lands

Building tack, compound cohesion, ply adhesion

Tack (green) → reinforcement (cured)

Tackifier resins hold uncured plies together; reinforcing resins build a co-cured network.

Representative properties

C5 aliphatic	Tack for NR blends
C9 aromatic	Reinforcing, higher Tg
C5/C9 copolymer	Balanced tack + strength
Softening point	90–110 °C typical
Form	Flake · pastille

Function emphasis

Building tack

Green strength

Cured stiffness

Chapter six · process chemistry

Tyre Mould Release Systems

Clean release is quiet money: fewer defects, less mould fouling, better surface finish. Polyplas supplies ready-to-use water-based systems from specialist producers.

Grades carried

Water-based systems for mould and bladder coating

Where it lands

Curing press operations, clean demoulding, less downtime

Monolayer · clean demould

A molecular film keeps rubber from wetting the steel, so cycles between cleanings triple.

Representative properties

System	Water-based, semi-permanent
Application	Bladder · mould coating
Cycles per coat	20–60, compound-dependent
VOC	Low
Packaging	Drum · IBC

Function emphasis

Release cleanliness

Mould fouling

Lower is better

Bladder life

Coupling to mould release: 6chemistriesCoupling to mould release
Across eight countries: 17principalsAcross eight countries
Sustained growth in trade: 30per cent a yearSustained growth in trade

Sourced from
Shanxi and Rayton.

China · Rubber chemicals, C5 and speciality resins

Accelerators, antioxidants and resins arrive against certified analysis and are held in Indian warehouses. A cure system is not something a plant should be waiting on a customs queue for.

See every principal