By Norman Hewitt
This useful consultant to compounding elastomers with caused silica covers ideas, houses, blending, trying out and formulations from a pragmatic point of view. This instruction manual and reference handbook will serve those that paintings on half layout, elastomer formula, production and purposes of elastomers. plentiful dialogue of compound standards provides to the usefulness of this ebook to practitioners. Comparisons of carbon black and silica compounds through the booklet permit readers to pick the main compatible formula for functions starting from tires to electric insulation to shoe soles. the writer has over 40 years of expertise within the rubber highlighted by means of his 39 years on the PPG Rubber learn laboratories. A spotlight of the booklet is the inclusion of stories carried out by means of the writer which tremendously provides to the richness of the contents.
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Extra resources for Compounding Precipitated Silica in Elastomers: Theory and Practice
Among the criteria for reinforcement abrasion resistance, tear and tensile strengths unmodified silica is inferior only in respect to smooth surface abrasion resistance. S. market. In view of this preponderance of carbon black compounding usage, it is appropriate to begin a compounding appraisal of silica in terms of silica’s relation to black. Valid comparisons in respect to both filler and compound properties are best made on a basis of comparable filler particle size or compound hardness.
Technol. 32, 1286 (1959) 2. Strauss, “Analysis of Cure Parameters to Define Vulcanization and Reinforcement”, paper presented at ACS Rubber Division, spring meeting, 1965 3. Russell, “Activator Interactions Affecting Vulcanizate Properties of Silica filled SBR”, paper presented at ACS Rubber Division spring meeting, 1966 4. Wagner, “Reinforcing Silica and Silicates”, Rubber Chem. Technol. 3 (1976) 5. Parker, unpublished paper 6. Briggs et al, “Salt Content of Precipitated Silica”, Rubber Chem. Technol.
Knotty tear behavior is significant in its ability to resist tear propagation. 5 2 (1= excellent; 4= poor) Tear data must be interpreted with due regard to state of cure. This is a particular consideration for compounds designed for use in thick articles where curing involves periods of several hours at low temperatures. 22, based on a filler blend of 30 phr silica and 27 phr N231 carbon black, variations in sulfur and TBTD produce significant tear variation at differing cure conditions. 3-phr sulfur content.
Compounding Precipitated Silica in Elastomers: Theory and Practice by Norman Hewitt