Rubber Resins

P R O D UC T S E L E C TO R G U I D E

Unique Solutions for Rubber Resins
At SI Group, our unparalleled experience is what sets us apart. Our broad portfolio of tackifier,bonding, curing and reinforcing resins is used in rubber compounding to improve performance of rubber
products like tires, technical rubber goods and vehicle parts. SI Group’s rubber selector guide has
been designed to make your product selection decisions faster and easier. Additionally, our teams oftechnical experts are available to provide guidance and expertise along the way.

Tackifier Resins

Bonding Resins

The high performance and consistent quality of our standard
and super tackifier resins differentiate us. As a global leader
in alkylphenolic resins, our offerings provide optimal tackfor various time and environmental requirements. SI Grouptackifier resins are added to rubber compounds to promote
the bonding of different parts (plies) that make up a rubber
product until they are cured or vulcanized.

Our adhesion promoting offerings improve the overallbonding to mechanical reinforcements. Our ELAZTOBOND™
A bonding resins contain less than 0.5 percent free resorcinol
while providing excellent rubber-to-rubber knit strength.
SI Group bonding resins produce crosslinked secondary
networks, high modulus, good adhesion and high reactivity.
Reinforcing Resins

Curing Resins
Our unique collection of curing resins reduce thermoplasticity
while improving abrasion and chemical resistance withincreased tensile strength. Compared to sulfur curingsystems, SI Group resins provide better heat and moistureresistance, ideal for repeated heat cycles such as butyl
curing bladders. Additionally, our brominated products savetime and provide faster production capabilities by reducing
curing time.

Our reinforcing resin portfolio provides increased
hardness, toughness, stiffness and abrasion and tearresistance to the rubber compound. All of our offerings
have been developed to meet the reinforcing challengesof the rubber market. We provide several reinforcing
resins options including phenol-formaldehyde, distilledtall oil modified, cashew nutshell liquid modified and low
residual monomer grades.

SI Group’s rubber resins improve the safety and durability of modern tires.

RUBBER TYPESNRNatural Rubber

SBR

Styrene Butadiene Rubber

BR

Butadiene Rubber

IIR

Isobutylene Isoprene Rubber

NBR

Nitrile Rubber

HNBR

Hydrogenated Nitrile Butadiene Rubber

CR

Chloroprene

EPDM

Ethylene Propylene Diene Monomer

RUBBER RESINS PRODUCT SELECTOR GUIDE

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Tackifiers
SI Group’s wide selection of tackifier resins have been developed to meet the broad variety of tackneeds in many kinds of rubber and different applications. Several of our tackifiers are used in tires,but we offer several grades for use in specific s ituations including for low-polarity rubbers such as EPDM,for retreading, or for specific technical rubber applications.
Melting Point (ºC),
Ring and Ball

Tack Level

TackRetention

NRSBR

BRIIR

NBR

CR

EPDM

80100

120

140

Benefits

Standard Tackifier

SP-1068

standard

A general purpose PTOP based resin thatprovides industry standard tack. Widely usedin tires and technical rubber goods.

SC-2066

improved

A higher melting point alkylphenol resin withenhanced tack retention making it ideal for
retreading stocks.

SMD-31144

improved

A higher melting point alkylphenol resin withenhanced tack retention making it ideal for
retreading stocks.

HRJ-10420

standard

A general purpose PTOP based resin thatprovides industry standard tack. Widely usedin tires and technical rubber goods.

SP-1077

standard

A modified alkylphenol resin designed
specially for increased tack in EDPM and otherlow polarity rubbers.

ELAZTOBOND™
T-5000

improved

A general purpose PTOP based resin with ahigher melting point. Provides a good balanceof initial and long-term tack.

ELAZTOBOND™
T-5600excellentA very high performance mixed-alkylphenols
resin. Provides high tack in less polar rubbers.

ELAZTOBOND™
T-6000excellent

A supertackifier resin with high tack retention
ideally suited for highly filled compounds andlow tack polymers.

Super Tackifiers

HighRUBBER RESINS PRODUCT SELECTOR GUIDE

EffectivenessLow

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Reinforcing Resins
SI Group offers a range of resins to meet the reinforcing requirements for many types of rubber and toprovide low residual monomer solutions. The selection of a reinforcing resin system should consider
the required static and dynamic physical properties, processing and curing. SI Group’s reinforcing
resin solutions provide increased hardness, toughness, stiffness, abrasion and tear resistance to therubber compound.
Scorch Safety*ResidualMonomer

Effectiveness at 10 phrin Sulfur Vulcanization

FormNR

SBR/BRNR

SBR

BRIIR

NBR

CR

Melting Point (ºC)
EPDM

80

100120Benefits

Standard Phenolic Resins

SFP-118

SMD-30207

lowlow

pastilles

pastilles

333A general purpose reinforcing resinthat provides good compromise
between scorch safety and final
hardness which allows for use inmany applications.

3A general purpose reinforcing resinthat provides good compromise
between scorch safety and finalhardness which allows for use inmany applications.

5CNSL modified resin that provides
higher hardness thanPF or DTO resins in some rubbers,
can be scorch sensitive.

5A CNSL modified resin with low
residual monomer and a higher
hardness than PF or DTO resins
in some rubbers, can be scorchsensitive.

Modified Phenolic Resins

SP-6700

HRJ-11995

low

low

flakes /pastilles

flakes /pastilles

33SP-6600

lowpowder

35A CNSL modified resin that offers
high effectivness with mostrubbers. The powder form helps
incorporation in final mixing stage.
Contains 8% HMT.

SP-6601

lowpowder99

A DTO modified resin which offers
great scorch safety. The powder
form helps incorporation in final
mixing stage. Contains 8% HMT.

SP-6701

lowflakes /pastilles

99A DTO modified resin offers low
viscosity which improves filler
incorporation and has good scorch
safety.

RX-6702

standardflakes /pastilles

77

Oil modified resin with good scorch
safety and reinforcing properties.

HighRUBBER RESINS PRODUCT SELECTOR GUIDE

Effectiveness

Low*Higher number denotes better protection.
Higher number indicates small reduction inscorch time, lower number indicates bigger
reduction in scorch time.

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Curing Resins
SI Group’s innovative rubber curing solutions have been developed through years of product andapplication testing with our customers. Phenolic curing resins work in rubbers that have activated C=C
unsaturation and, in most cases, they are ideal for low unsaturation polymers because they provide
exceptional heat and aging resistance.
Rubber Type*

Resin Cure Suitability

NR, SBR, BR

Will crosslink but generally not used due to high unsaturation; used for NR based adhesives

IIR

Gives exceptional heat aging performance; widely used for bladder production

NBR, HNBR

Gives exceptional aging properties

CRThe non-brominated resins require an activator, normally a Lewis acid system. CR cannot be crosslinked using
phenolic resin.

EPDM

Gives exceptional aging properties; especially suitable for thermoplastic vulcanate (TPV) production.
*See definitions on Page 1 of the Rubber Resins Product Selector Guide
Methylol Content (%)

Melting Point (ºC)

CureSpeedFormSP-1044

standardflakes

An octylphenol resol based curing resin thatoffers moderate cure speed. Ideal for use in tire
bladder manufacture to cure IIR.

SP-1045standard

flakesAn octylphenol resol based curing resin thatoffers moderate cure speed. Ideal for use in tire
bladder manufacture to cure IIR.

SP-1045P

standard

pastilles

An octylphenol resol based curing resin thatoffers moderate cure speed. Ideal for use in tire
bladder manufacture to cure IIR.

HRJ-10518

improved

flakesAn octylphenol resol curing resin that offers
faster cure speed than other non-brominatedalternatives.

6810121480

90

100

110BenefitsOctyphenol Resol

Octyphenol Resol, BrominatedSP-1055

excellent

flakes

SP-1056

best

flakesstandard

flakes

A brominated octylphenol based curing resinthat offers very fast cure. With this product there
is no need for added halogen donor. Ideal forsmall cross section parts with short cure cycles.
A brominated octylphenol based curing resinthat offers extremely fast cure. No need for
added halogen donor. Also ideal for small crosssection parts with short cure cycles.

Butylphenol Resol
ELAZTOBOND™
C 730

A butylphenol based resin that offers fast cure
speed with the benefit of being PTOP-free.

Alkylphenol Resol in Mineral Oil
SMD-31214

standardliquid(30% solidscontent)*N/AA liquid alkylphenol resol oil that is designed tocure EPDM for continuous production of TPV.

* on solid resin, 3.4%

RUBBER RESINS PRODUCT SELECTOR GUIDE

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Bonding Resins
SI Group’s bonding resin offerings are used to meet the optimal performance required by ourcustomers in rubber compounds as solid resins or as part of a water-based dipping system as liquidresins. Bonding resin selection needs to take into account the rubber, the mechanical reinforcement(wire or textile), the surface treatment of the reinforcement, the process conditions and the service
conditions of the final product. All solid bonding resins require a curative such as HMMM or HMT.

Low
FumeLevel

Compatibility
TypeForm

NR

SBR

BR

IIR

NBR

Melting Point (ºC)
CR

EPDM

100

120140Benefits

Solid Phenolic Resin

R-7576HR

ELAZTOBOND™
A220

ELAZTOBOND™
A250

Modified
improved phenolicresin

A modified phenolic resin thatoffers a very low fume level
while maintaining good aging
properties.

pastillesgoodVery
low freeresorcinol,
flakesmodifiedphenolicresin

A modified phenolic resin
designed to give long-termbonding with exceptional flex
resistance and aging properties.
Provides a very low fume leveland very low free resorcinol.

excellentVery
low freeresorcinol,
flakesmodifiedphenolicresin

A modified phenolic resin
designed to give long-termbonding with exceptional flex
resistance and aging properties.
Provides a very low fume leveland very low free resorcinol.

High

Effectiveness

Low

TypeForm

Viscosity (mPas)

pHSolids Content %Benefits

Resorcinol /formaldehyde resinin waterliquid3000–5000

1.2–2.5

73–77

Used as a component of latex dip
systems for tire cord or belt andhose fabric.

Liquid Phenolic Resin

SRF-1524

Our bonding resins help to provide
permanent bonds between rubber
and mechanical reinforcements
such as wire and textiles.

RUBBER RESINS PRODUCT SELECTOR GUIDE

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SI Group offers a wide range of tackifier resins that provide the optimal tack for specific compounds, time and condition requirements, while also
ensuring high quality and consistent performance.

RUBBER RESINS PRODUCT SELECTOR GUIDE

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SI Group, Inc. North America
Corporate Headquarters
2750 Balltown Road
Schenectady, NY 12301, U.S.A.
Tel: +1 518.347.4200

Brazil – Rio ClaroTel: +55 19.3535.6700

Korea – Seoul
Tel: +82.2.6937.8900

Singapore
Tel: +65 6506.2900

China – Shanghai
Tel: +86 21.2422.9200

France – Bethune
Tel: +33 3.21.68.67.67

South Africa – Johannesburg
Tel: +27 11.389.8200

England – Wolverhampton
Tel: +44 1902.790.555

India – Navi Mumbai
Tel: +91 22.6673.2000

Switzerland – Pratteln
Tel: +41 61.825.81.11

The information presented herein is believed to be accurate and reliable, but is presented without guarantee or responsibility on the part of SI Group, Inc. and its affiliates to ensure theaccuracy or reliability of the information. Customers should contact SI Group account representatives for current information. It is the responsibility of the user to comply with all applicablelaws and regulations relating to use of the product and to provide for a safe workplace. The user should consider all information contained herein only as a guide, and should takeprecautions that the user considers necessary or prudent to promote a safe work environment, such as considering all applicable health and safety hazards, developing safe work practiceprocedures and properly instructing employees, and reviewing the Safety Data Sheet (SDS) and product label for safety information.
ELAZTOBOND is a trademark of SI Group, Inc.
© 2019 SI GROUP, INC. ALL RIGHTS RESERVED.

UT05672 R4 (05/19)