Reaxis^®  C322 - Dibutyltin bis-(2-ethylhexyl mercaptoacetate)

• Product Category Organotin

---

• Chemical Name Dibutyltin bis-(2-ethylhexyl mercaptoacetate)

---

• CAS Number 10584-98-2

---

Parameter	Range
Tin Content (%)	18.0 - 19.0
Density (g/ml)	1.07 - 1.18
Viscosity (cP @ 20°C)	42 - 78
Color (Gardner Number)	5 Max

• TSCA (US) Yes

---

• DSL (Canada) Yes

---

• AICS (Australia) Yes

---

• KECI (South Korea) Yes

---

• IECSC (China) Yes

---

• ENCS (Japan) Yes

---

• TCSI (Taiwan) Yes

---

• NZloC (New Zealand) Yes

---

• PICCS (The Philippines) Yes

---

• NDSL (Canada) No

---

• REACH (EU) No

---

Unlike standard organotin carboxylates, sulfur-bearing organotins are primarily used as a catalyst for polyurethanes. Reactivity of catalysts such as Butyl Tin Merceaptide tend to be inactive in silicone and esterification-related applications. As the sulfur ligand acts as a blocking agent, thermal deblocking is required to initiate the back-end cure. Thus, catalysts such as REAXIS^® C322 tend to perform best in adhesive, elastomer, and foam applications with adequate exotherms. For coatings applications, REAXIS^® C322 can be used in baked cured systems in contrast to ambient cured systems. 

As is typical of most organotin and inorganic tin catalysts, the specific ligand contributes a major influence on overall reactivity. This is specifically highlighted in regard to sulfur-bearing ligands. In general, these sulfur ligands impart improved front-end delay and hydrolytic stability versus standard tin carboxylates. Standard ligands include thiols, mercaptides and mercaptoacetates. Reactivity as defined by delay, thermal availability, hydrolytic stability, and final cure will depend on the specific ligand, tin content, alkyl group and, most importantly, other raw materials used in the specific polyurethane formulation. As Butyl Tin Mercaptide is a mercaptoacetate-based catalyst, its delay should be more pronounced compared to mercaptans such REAXIS^® C319 and REAXIS^® C320. In regard to the reactivity of the various urethane reactions, catalysts such as REAXIS^® C322 will selectively catalyze the isocyanate-polyol reaction, with less of an effect on the water reaction. 

• 44 lb (20 kg) plastic pail
• 485 lb (220 kg) plastic drum

REAXIS^® C322 should be stored in the original packaging at moderate temperatures and kept from freezing. The container should be closed tightly after each use to maximize shelf life. Characteristic of most Sn (IV) organotins, the primary cause of instability would be hydrolysis. Although more stable compared to organotin carboxylates, long-term contact with moisture could result in hydrolysis with the formation of tin oxide insolubles leading to deactivation of REAXIS^® C322. 

Before use of Reaxis products please refer to the relevant Safety Data Sheet (SDS) for safety and toxicological data as well as for the information on proper transportation, storage, and use. SDSs are available by request via our web site reaxis.com, contacting your local representative, or emailing direct to techservices@reaxis.com.

Section	Hazard Class	Category	Hazard Statement
A.10	acute toxicity (oral)	4	H302
A.1D	acute toxicity (dermal)	3	H311
A.1I	acute toxicity (inhal.)	3	H331
A.2	skin corrosion/irritation	2	H315
A.3	serious eye damage/eye irritation	2	H319
A.4S	skin sensitisation	1	H317
S.5	germ cell mutagenicity	2	H341
S.8	specific target organ toxicity - single exposure	1	H370
A.9	specific target organ toxicity - repeated exposure	1	H372

DOT		IMDG	ICAO	Environment Hazard
UN Number	UN 2788	UN 2788	UN 2788	hazardous to the aquatic environment
UN Proper Shipping Name	Organotin compound, liquid, n.o.s.	ORGANOTIN COMPOUND, LIQUID, N.O.S.	Organotin compound, liquid, n.o.s.
Transport Class	6.1	6.1	6.1
Packing Group	lll	lll	lll

• Dibutyltin bis(2-ethylhexylthioglycolate)

• C214
• C319
• C320
• C416