DYPHENE® 8318 Formaldehyde, polymer with 4-(1,1,3,3-tetramethylbutyl) phenol CAS# 26678-93-3

Dyphene® 8318 is an oil-soluble, non-heat reactive alkyl phenolic novolak resin that imparts exceptional initial tack and tack retention to rubber compounds.  It is used extensively as a tackifier in tire compounds based on blends of NR, SBR and BR.


  • Imparts high initial tack in green rubber stock (auto-adhesion)
  • Retains a high level of tack even after extended exposure to high temperature and humidity.
  • Exhibits good compatibility.
  • Offers greater economy than many less expensive resins because lower loadings of DYPHENE® 8318 can yield equivalent tack.
  • Functions as a processing aid, dispersion aid for other compounding ingredients, and reduces compound viscosity.
  • Out performs hydrocarbon resins for tack, tack retention and physical properties in many applications.

SUGGESTED USES:  Tackifying resin for building tack in tire carcass stocks using NR/SBR and NR/SBR/BR blends, and inner liner recipes containing chlorobutyl/SBR/NR blends.  Tackifying resin for tire cements, rubber-compounding applications that now use hydrocarbon resins.

Standard Package: 50# bags

Shelf life: More than one year at temperatures of 100°F or lower.

Recommended Storage:  Store in dry area.


Appearance: Yellow to amber flakes or pastilles
*Softening point (Ring & Ball)°C


*Acid Number


*Acetone Insolubles

0.3 Max.

*Gardner Holdt Viscosity (num)

2.0 – 4.0

Specific Gravity


SOLUBILITY: Recommended solvents for DYPHENE® 8318 include:

Xylene , Methyl Ethyl Ketone


Hexane, VM&P Naphtha

Rubber Solvent

, Carbon Tetrachloride

*Actual values reported on certificate of analysis.

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      • 60 S. Seiberling Street
      • Akron, OH 44305

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