Premium S.T.R. 5 CV (Constant Viscosity)
Standard Thai Rubber 5 Constant Viscosity (S.T.R. 5 CV) represents the highest tier of technically specified natural rubber. It is chemically treated to stabilize its Mooney Viscosity, delivering a product with exceptional processing uniformity that is crucial for high-specification manufacturing. Our premium grade S.T.R. 5 CV ensures optimal consistency, translating directly into reduced scrap rates and superior quality control for our clients.
Key Technical Specifications
Our S.T.R. 5 CV is guaranteed to meet or exceed the following typical industry standards, focusing on highly controlled viscosity (full specifications available upon request):
Characteristic | Max. Limit (Guaranteed) |
Dirt Content (wt. %) | 0.05 |
Ash Content (wt. %) | 0.50 |
Nitrogen Content (wt. %) | 0.50 |
Volatile Matter (wt. %) | 0.80 |
Initial Plasticity ($P_o$) | 35 min. |
Plasticity Retention Index (PRI) | 60 min. |
Mooney Viscosity ($ML(1'+4')$ @ $100^{\circ}C$) | Controlled Range (e.g., $60 \pm 5$) |
Constant Viscosity Advantage (CV Grade)
Guaranteed Processing Uniformity: The "Constant Viscosity" (CV) characteristic means the rubber's viscosity is chemically stabilized and maintained within a tight, specified range. This provides predictable flow properties during mixing and molding, drastically reducing batch-to-batch variation.
Highest Purity: As an S.T.R. 5 grade, the dirt content is strictly controlled to an extremely low maximum of 0.05%, making it suitable for the most sensitive and high-performance applications.
Optimal Curing Stability: The high Plasticity Retention Index (PRI) ensures the material maintains its performance integrity during heating, essential for producing final products with consistent physical and mechanical properties.
Recommended Applications
S.T.R. 5 CV is the premium choice for applications demanding absolute precision, low impurity, and consistent dynamic performance:
Precision Automotive Components: High-performance seals, gaskets, and shock absorbers.
Medical and Pharmaceutical: Stoppers, plungers, and specialized tubing (where purity is paramount).
Technical Molded Goods: Components requiring tight dimensional tolerances and consistent weight.
Aviation/Aerospace: Specialized vibration dampeners and critical sealing elements.
Packaging and Logistics
Standard Weight: $33.33 \text{ kg}$ compressed bales.
Packaging: Polyethylene wrap (specifically chosen for compliance with high-grade product standards).
Traceability: Fully traceable lot numbers to ensure seamless quality auditing.
STR 5 CV
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