Section 8 of the Act covers reporting requirements. All employers must report to OSHA within eight hours if an employee dies from a work-related incident, or three or more employees are hospitalized as a result of a work-related incident. Additionally, all fatal on-the-job heart attacks must also be reported. Section 8 permits OSHA inspectors to enter, inspect and investigate, during regular working hours, any workplace covered by the Act. Employers must also communicate with employees about hazards in the workplace. By regulation, OSHA requires that employers keep a record of every non-consumer chemical product used in the workplace. Detailed technical bulletins called material safety data sheets (MSDSs) must be posted and available for employees to read and use to avoid chemical hazards. OSHA also requires employers to report on every injury or job-related illness requiring medical treatment (other than first aid) on OSHA Form 300, "Log of Work-Related Injuries and Illnesses" (known as an "OSHA Log" or "Form 300"). An annual summary is also required and must be posted for three months, and records must be kept for at least five years.