What makes butyrate dope safer than nitrate dope?

Butyrate dope is considered safer than nitrate dope primarily because it is much less flammable. Nitrate dope was commonly used in the past but has a higher risk of ignition due to its volatile nature and flammability. The reduced flammability of butyrate dope makes it a more suitable choice for applications like fabric covering on aircraft, where safety is a significant concern, especially in environments where open flames or sparks may be present.

While the drying characteristics, toxicity levels, and adhesion to fabrics are relevant factors in dope selection, they do not primarily define the safety aspect associated with flammable materials. The significant difference in flammability directly impacts the safety of operations involving the application and use of these dopes in aircraft construction and maintenance.