Is Switching from SCR10 to SVR10 the Same as Switching from No. 20 to No. 10 Rubber?

Three Types of Conversion

Origin Conversion: same grade, different country/mill, e.g., SCR10→SVR10, Malaysia CV60→Vietnam CV60. A/B validation against customer specifications is still required, but the technical justification is the lightest.

Grade Conversion: switching grades, e.g., changing from current No. 20 rubber to No. 10 rubber. The specification framework changes; it cannot be treated as a direct same-grade substitute.

Specification Conversion: across standard systems, e.g., replacing domestic whole latex SCR WF with SVR 3L. Both may derive from field latex, but they fall under different national standards and grade definitions, and must be managed as a conversion project.

Why It Must Be Clearly Stated

The conversion type determines the validation level, lead time, and liability boundary. Promising a Specification Conversion as an Origin Conversion means that when processing or performance differences arise, the customer will attribute the issue to the supplier; conversely, characterizing a simple Origin Conversion as a "brand-new material" unnecessarily raises the qualification bar.

Note one exception: a customer's internal designation such as "No. 1 Standard Rubber" should not be directly mapped to a specific national grade; obtain the technical specification sheet and correlate accordingly.