Society of Plastics Engineers.Mid-Hudson Section Society of Plastics Engineers.Western Sections Society of Plastics Engineers.New York Section Society of plastics Engineers Western Sections. Society of Plastics Engineers.Pioneer Valley Section Society of Plastics Engineers.Baltimore-Washington Section Society of Plastics Engineers.Technical Papers Society of Plastics Engineers.Vinyl Rrofessconal Activity Group Society of Plastics Engineers Society of Plasics Engineers.