Methyltin Mercaptide 181


Product Name:  Methyltin Mercaptide

Ingredient:  Methyl tin mercaptide heat stabilizer; Methyl Tin Stabilizer

Item No.:  BX Tin 181

CAS No.: 57583-35-4

Formula:  C31H60O6S3Sn and C22H44O4S2Sn

The mass ratio of methyl tin mercaptide and dimethyl tin mercaptide is around 25/75.


Technical specifications

ItemsSpecificationsExecutive standards
AppearanceClear liquid
Color (Pt-Co) ≤50GB/T1664
Density (25℃) g/cm31.18±0.01GB/T13216.5-1991
Viscosity (25℃) mPa.S60-90GB/T12008.8-1992
Tin content (%)19.0±0.5Iodometry



Heat Stability:    BX Tin 181 has highly efficient heat stability and good early color stability.

Transparency: The products processed with BX Tin 181 have superior transparency, clear color, little gas, and no educt.

Process:  The excellent high-temperature color stability and long-term dynamic stability provided by BX Tin 181. Without fouling, the time of cleaning equipment is shortened. It is suitable for all kinds of process of flexible and rigid PVC, such as calendaring, extrusion, injection and blow molding, etc.

Amount: On the same condition, less methyl tin mercaptide compared with butyl tin or octyl tin can achieve the same effect.

Safety: The product of methyl tin mercaptide has been approved by American FDA (21 CFR 178.2010) and certified by Germany BGA (IIA, 4C). It can be used in food packaging materials and water pipes etc. It’s safe and reliable.


  • PVC film (thermal shrinking packaging film, printing film, calendared film, twisting film)
  • PVC sheet (clear flexible and rigid sheet, advertisement sheet, compound sheet)
  • PVC granule (granule, shell of electronic communication apparatus, etc.)
  • PVC building and construction materials (drinking water pipe and pipe fittings, chemical pipes, construction materials, profile etc.)
  • PVC medical apparatus (transfusion device, etc.), food packaging materials, daily-used appliances, and others


The product is packed into an iron drum with a plastic coating or plastic bucket, and the net weight is 220kg per drum.

Transportation: The product is the heat stabilizer for processing PVC, and it is non-flammable and non-explosive.

Storage: The iron bucket should be placed in cool and dry area with a storage temperature of 5 to 30℃. The bucket should be sealed immediately after use.

Safety:  Avoid any contact with mouth, eyes and skin. In case of contact with skin, wash thoroughly with soap and water immediately. In case of contact with the eyes or mouth, flush with water immediately and get medical attention. The workplace should be ventilated so as to avoid inhaling evaporated gas directly in the production operation.

Environment:: According to environmental safety standards of the Occupational Safety & Health Administration (OSHA), including the standard of tin use for all industries. TWA (eight hours average value) is 0.1mg/m3 (tin); short-time exposure value is 0.2mg/m3

Warranty period: 12 months