Plan a trial for your application
Conventional vulcanization
Use one formulation to compare scorch, cure curves and crosslinking in the finished article.
Bloom prevention
After specified holding and thermal history, inspect the uncured compound and finished-part surface.
Purchase specifications and incoming inspection
Review these properties for the intended application grade. Example figures refer to the cited grade or source. Confirm the offered specification, packaging and lead time in the quotation. LANXESS · Materials for rubber cure systems ↗
| Property | Unit | Published or agreed specification | Test conditions and checks |
|---|---|---|---|
| Total sulfur | % by mass | Confirm against the offered grade and purchase specification | Use the as-received product basis and distinguish oil from carrier. |
| Insoluble sulfur fraction | % by mass | Confirm against the offered grade and purchase specification | State whether the denominator is commercial product or total sulphur, and specify the test method. |
| Particle size or carrier form | µm or morphology | Confirm against the offered grade and purchase specification | Match the dispersion process and dust-control conditions. |
When approving a sample, record the grade, methods, limits and specification revision. On receipt, match the packing lot number to the lot-specific COA and record the measured values and release decision.
From samples to commercial delivery
Packaging and receiving
Specify powder, oil-treated or predispersed grade. Check packaging and transport against its SDS.
Storage and handling
Record manufacture date and heat exposure on receipt. Retest insoluble sulfur by the specified grade method.
Sample and order lead times
State the finished part, machine trial quantity and routine order size. Match trial and commercial grades and agree MOQ, load unit, lead-time start and arrival.
Questions from the plant
Why can rubber sheets with equal total sulphur bloom differently in storage?
Compare insoluble sulphur fraction, standing time and temperature history.
Can predispersed masterbatch be dosed at the same weight as sulphur powder?
Convert to effective sulphur first and assess the carrier’s contribution to the recipe.
Report a delivery or batch issue
Include the order number, lot number from the package, label photos and inspection records for the affected lot. When retesting, check Total sulfur, Insoluble sulfur fraction, Particle size or carrier form.
Request documents for your application
TDS · Technical data sheet
For grade selection and sample approval, specify the grade and revision required.
SDS · Safety data sheet
Specify the country or region of use and the required language.
COA · Certificate of analysis
Request a sample COA during supplier review. For incoming inspection, provide the actual lot number.