ZBEC is an ultra-fast secondary amine dithiocarbamate accelerator for the sulfur vulcanization of natural and synthetic rubbers. It belongs to the nitrosamine-safe class of accelerators and is widely used as a drop-in replacement for ZDEC (EZ/ZDC), ZDBC (BZ), and ZDMC (PZ).
Key Specifications
|
Parameter |
Specification |
|
Appearance |
White to off-white powder or granules |
|
Initial Melting Point |
≥ 180.0°C (ASTM D1519 A) |
|
Assay |
≥ 96.0% |
|
Zinc Content |
10.0 – 12.0% |
|
Density |
~1.42 g/cm³ |
|
Loss on Drying |
≤ 0.50% |
|
Sieve Residue (150μm) |
≤ 0.10% |
Applications
Primary or secondary accelerator in NR, SBR, BR, NBR, IIR, and EPDM
Latex vulcanization – primary ultra-accelerator
Food-contact articles – FDA 21 CFR 175.105 & 177.2600
Medical rubber components, baby products, and dipped latex goods
Automotive weatherstrips, hoses, and seals
Light-colored, transparent, and brightly colored compounds
Performance Advantages:
|
Property |
ZBEC Performance |
|
Scorch safety |
Longest scorch time among all zinc dithiocarbamates |
|
Cure speed |
Ultra-fast, comparable to ZDBC/ZDC |
|
Nitrosamine formation |
None – generates non-regulated N-nitrosodibenzylamine |
|
Staining |
Non-staining, non-discoloring |
|
Hydrolysis resistance |
High |
|
Solubility in rubber |
Low – surface blooming may occur at high dosages |
Recommended Dosage
|
Application |
Dosage (phr) |
|
NR – secondary accelerator |
0.1 – 0.5 |
|
EPDM – secondary accelerator |
0.5 – 2.5 |
|
UHF vulcanization |
1.0 |
|
General use – secondary |
0.5 – 1.5 |
Storage: 24 months in original packaging, cool and dry place
The Challenge
An EPDM automotive weatherstrip manufacturer was using a conventional thiuram accelerator. They faced two critical problems:
Frequent scorch during hot summer processing – leading to high scrap rates
Failed nitrosamine testing from a German OEM customer – risking a major contract
The Solution
The manufacturer switched to ZBEC‑75 at 0.7 phr combined with TBBS‑80 as a primary accelerator.
The Results
|
Metric |
Before (Thiuram) |
After (ZBEC + TBBS) |
|
Scorch time |
Baseline |
+45% increase |
|
Cure speed |
Baseline |
Unchanged |
|
Nitrosamine test |
Failed |
Passed easily |
|
Surface bloom |
Present |
Eliminated |
The Bottom Line
The manufacturer retained their German OEM contract, reduced scrap rates, and future-proofed their production for tightening EU regulations.
Sample: could be supplied for test, contact us for sample.
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