How to Buy MBT: Specs, COA and Packing

2-Mercaptobenzothiazole (MBT, CAS 149-30-4) is a commodity accelerator, so price matters – but the specification decides whether a batch will perform in your compound. This guide covers the parameters to confirm, the forms available, packaging and the paperwork to ask for.

1. The specification to confirm

Property	Specification	Why it matters
Appearance	Off-white to pale-yellow powder or granules	Visual acceptance; granules are lower-dust
Initial melting point	170.0 deg C min	Reflects purity; low melting point signals contamination
Loss on heating (100 +/- 2 deg C)	0.30% max	Controls moisture that disturbs the compound
Ash (750 +/- 25 deg C)	0.30% max	Inorganic residues
Residue on 150 um sieve	0.10% max	Dispersion and handling; coarse material is slower to incorporate
Purity (titration / HPLC)	97.0% min	The active content you are paying for

2. Powder or granules?

Form	Advantages	Considerations
Powder	Fast dispersion; lower price	Dustier; needs good ventilation and dust control
Granules	Lower dust, better flow, easier weighing	May cost slightly more; check dispersion in your mixer

MBT is a skin sensitizer, so the granule form is often chosen for a cleaner, low-dust working environment – worth confirming with your EHS team.

3. Packaging

Form	Typical packaging
Bags	25 kg PP/PE bags
Jumbo bags	1000 kg bags for bulk use
Container	Palletised for shipment; full container loads

Keep bags sealed and dry; store cool, away from oxidising agents and strong acids.

4. Documents to request

Specification sheet – the values the supplier guarantees.
Certificate of analysis (COA) per batch – melting point, loss on heating, ash, sieve residue and purity.
Safety data sheet (SDS) – for classification, handling and transport.
Third-party inspection (for example SGS/BV) on request for pre-shipment quantity and quality.

5. Supplier checklist

States melting point, purity, loss on heating, ash and sieve residue in writing.
Offers the form (powder or granules) and packaging you need.
Provides a per-batch COA and SDS.
Quotes FOB or CIF to your port with lead time.
Can supply consistent batches for repeat production.

6. Getting the best terms

MBT is the highest-volume benzothiazole accelerator and its price tracks the feedstock cycle, so quotes move. For repeat users, quote an annual or quarterly volume and align deliveries with consumption and storage. China is a major producer and exporter of MBT and the accelerators derived from it, which keeps supply broad. Tell us the form, tonnage and delivery port for a quotation.

Frequently Asked Questions

What purity does MBT come in?

The standard commercial grade is 97.0% min by titration/HPLC, with an initial melting point of 170 deg C min.

Should I buy MBT powder or granules?

Granules give lower dust, which matters because MBT is a skin sensitizer; powder is usually cheaper and disperses faster. Choose by your mixing setup and EHS requirements.

What documents should I get with MBT?

A specification sheet, a per-batch COA (melting point, loss on heating, ash, sieve residue, purity) and the SDS, plus third-party inspection on request.

How is MBT packed?

In 25 kg bags and 1000 kg jumbo bags, palletised for container shipment.