Consumer rubber must feel right, look right, and be safe:
comfortable, flexible, cushioned
visually clean and uniform
compliant with PAH/odor/volatility limits
Footwear Soles & Midsoles
Used in
Casual Soles
Sports shoes
Slippers
Comfort Footwear
Conventional Carbon Blacks & Application
Commonly:
N660/N772
type blacks for soles, as they give reasonable softness and wear
Some use thermal black blends to soften compounds.
Industry Problems with Conventional Grades
Standard blacks can raise hardness more than desired, making soles less comfortable.
Dispersion issues cause specks, streaks or flow marks on visible tread.
PAH and odor concerns in contact applications
ISTAR Solution – PLASTEXA® + DURONIX®
PLASTEXA® soft-rubber black series
Larger particle, low structure design for softness and comfort feel.
Easy dispersion → clean tread patterns, no specks.
Lower hardness rise at target phr.
DURONIX® non-reinforcing / thermal-type variants
Further soften compounds, reduce heat buildup and improve flexibility in thicker soles.
Larger particle, low structure design for softness and comfort feel.
Easy dispersion → clean tread patterns, no specks.
Lower hardness rise at target phr.
Further soften compounds, reduce heat buildup and improve flexibility in thicker soles.
Result: Soles with better comfort, cleaner appearance, controlled hardness and improved wear, engineered through carbon black choice.
Product Name
Product Description
Datasheet
SDS
PLASTEXA®
A low-volatility, dispersion-friendly carbon black series developed for clean processing, low odor and stable rheology. It delivers consistent colour and smooth surfaces across sensitive and regulated applications in plastics, rubber, coatings and inks.
DURONIX®
A low-structure, ultra-clean carbon black series designed to improve flow, dispersion and surface quality. It supports smooth processing and reduced defects in films, molded parts, hoses, seals and cable compounds.
TDS
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SDS
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