All students should sign a safety contract before they begin working in the laboratory. It protects the students and teachers. Flinn has produced a sample contract that can be modified to suit the class's needs. Definitely worth downloading!
This resource is a Powerpoint presentation aimed at teachers. It describes what teachers should look out for, how they should prepare for emergencies, and what protocols they should follow when performing labs with their students. This is a great presentation that would be very beneficial to all teachers before they start working with kids.
The National Association of Science Teachers has produced an excellent text that advises schools how to design new science labs. It incorporates safety features and provides a lot of support for why labs should be set up in a particular way. This book is essential for those teachers who are actively involved with designing new science labs.
Flinn Scientific has produced a collection of videos and other resources that extensively detail how teachers are liable for the safety of their students in the lab. These videos cover just about every scenario that could occur. Science and the law is something every science teacher should know.
This article from the American Chemical Society provides an in-depth analysis of all the safety issues that occur in an elementary science classroom and offers suggestions as to how to keep younger kids safe. Essential for elementary teachers.
The National Association of Science Teachers has assembled a very lengthy list of all kinds of safety protocols that should be followed in a science classroom. This would be a great place to start as it covers just about everything.