Section 1 - CHEMICAL PRODUCT AND COMPANY IDENTIFICATION

PRODUCT NAME

HEXAMETHYLENE-1,6-BIS(THIOSULFATE), DISODIUM, DIHYDRATE

NFPA

PRODUCT USE

Rubber preservative. Used in sulfur based vulcanisation systems to generate hybrid
crosslinks which provide increased retention of physical and dynamic properties when
exposed to anaerobic conditions at elevated temperatures such as those experienced during
overcure, when using high curing temperatures or during product service life.

SYNONYMS

C6-H14-O6-S4.2Na, NaSO3S(CH2)6SSO3Na.2H2O, "thiosulfuric acid (H2S2O3), S, S'-1, 6-
hexanediyl ester, disodium salt", "thiosulfuric acid (H2S2O3), S, S'-1, 6-hexanediyl
ester, disodium salt", "thiosulfuric acid, S, S'-hexamethylene ester disodium salt",
"thiosulfuric acid, S, S'-hexamethylene ester disodium salt", "hexamethylene sodium
thiosulfate", "sodium hexamethylene-1, 6-bisthiosulfate dihydrate", "sodium hexamethylene-
1, 6-bisthiosulfate dihydrate", HTSNa, "Duralink HTS", "Pilcure DHTS", DHTS

Section 2 - HAZARDS IDENTIFICATION

CANADIAN WHMIS SYMBOLS

EMERGENCY OVERVIEW

RISK

May cause SENSITIZATION by skin contact.
Harmful to aquatic organisms, may cause long- term adverse effects in the
aquatic environment.

POTENTIAL HEALTH EFFECTS

ACUTE HEALTH EFFECTS

SWALLOWED

  Although ingestion is not thought to produce harmful effects, the material may still be damaging to the health of the individual following ingestion, especially where pre-  existing organ (e.g. liver, kidney) damage is evident. Present definitions of harmful or toxic substances are generally based on doses producing mortality (death) rather than those producing morbidity (disease, ill-health). Gastrointestinal tract discomfort may produce nausea and vomiting. In an occupational setting however, ingestion of insignificant quantities is not thought to be cause for concern.  

EYE

  There is some evidence that material may produce eye irritation in some persons and produce eye damage 24 hours or more after instillation. Moderate inflammation may be expected with redness; conjunctivitis may occur with prolonged exposure.  

SKIN

  Skin contact is not thought to have harmful health effects, however the material may still produce health damage following entry through wounds, lesions or abrasions.  There is some evidence to suggest that the material may cause moderate inflammation of the skin either following direct contact or after a delay of some time. Repeated exposure can cause contact dermatitis which is characterized by redness, swelling and blistering.  Open cuts, abraded or irritated skin should not be exposed to this material.  

INHALED

  The material is not thought to produce adverse health effects or irritation of the respiratory tract (as classified using animal models). Nevertheless, good hygiene practice requires that exposure be kept to a minimum and that suitable control measures be used in an occupational setting.  

CHRONIC HEALTH EFFECTS

  Skin contact with the material is more likely to cause a sensitization reaction in some persons compared to the general population.  Long term exposure to high dust concentrations may cause changes in lung function i.e. pneumoconiosis; caused by particles less than 0.5 micron penetrating and remaining in the lung. Prime symptom is breathlessness; lung shadows show on X-ray.  Animal studies indicate that dermal contact may result in allergic responses. Tests with guinea pigs showed the material to be an extreme sensitiser. In controlled skin contact studies with human volunteers, the material produced allergic skin reactions. * Van Waters and Rogers