STAO’s Safety Mindedness Program, the leading safety training program for Ontario Science teachers has been updated. Safety Mindedness now works seamlessly on virtually any device. Gestures like screen shrinking and expanding now works on tablets and phones. Continue reading
This useful link provides you with a general set of lab safety rules for lab activities and teacher demonstrations that can easily be adapted to your classroom.
What are the Labelling Requirements for Consumer Products in 2017?
WHMIS 2015 covers a wide range of hazardous chemicals and substances (called “controlled products”), including everyday chemical products found in workplaces, such as cleaning supplies, adhesives and solvents. Continue reading
Students use electrical devices every day. An essential safety component of any electrical device is the fuse. Demonstrate what it means to “blow a fuse” and show why fuses are important safeguards against electrical fires. Courtesy of Flinn Scientific Canada.
This article by James Kaufman, of the Laboratory Safety Institute (LSI) provides an interesting summary of the myths and facts regarding contact lens safety in the lab.
This article is provided with permission of LSI and was originally published in their Winter 2016-17 issue of “Speaking of Safety” newsletter. Access to the newsletter is free. Sign up for your subscription
There has been a lot of confusion generated when a select group of chemicals were listed as restricted, and special ordering procedures were initiated by the Federal government. Continue reading
WHMIS 2015 covers a wide range of hazardous chemicals and substances (called “controlled products”), including everyday chemical products found in workplaces, such as cleaning supplies, adhesives and solvents. Although not as dangerous as other controlled products used in industrial processes, these products may still pose hazards to workers and the environment.
In Canada, any controlled product that’s packaged as a consumer product and in quantities normally used by the public is generally exempt from WHMIS 2015 supplier label and SDS requirements. An item is generally considered to be “packaged as a consumer product” if it’s:
- In a container of a size and type usually sold to the public; and
- Available for sale to the public through retail outlets.
Example: A solvent considered a controlled product under WHMIS 2015 that’s packaged in a 250-millilitre container and sold in a hardware store is a consumer product and thus is exempt from supplier label and SDS requirements. The same solvent packaged in a 454-litre drum and sold at an industrial supply outlet isn’t a consumer product and does require a supplier label and SDS.
Labels on consumer products generally have sufficient information to serve as workplace labels. School board training should already be in place to ensure that workers can read and understand the warnings on consumer products.
As some of the consumer products stored in our chemical store rooms are intended to be ingested, a label indicating that it is not to be eaten should be attached to the container. Citing that it is potentially contaminated should discourage students from eating these consumer products.
- WHMIS 2015 covers hazardous chemicals (controlled products)
- Consumer products sold to the public and in quantities used by the public are exempt from WHMIS 2015 supplier labels and SDS requirements.
- In most cases the existing label will serve as a workplace label.
- Worker training will be limited to ensuring that the worker understands the warnings on the label.
In a recent blog post, the activity Elephant’s Toothpaste was demonstrated. The activity was in keeping with our STAO safety policy regarding chemical use. In that policy, we suggest the use of small quantities of chemicals, at as low a concentration as possible to allow the reaction to proceed. Teachers are also asked to explore safer alternatives to replace reactions that introduce an unacceptable element of risk. In this video, it was suggested that the reaction proceed with 3 or 6% hydrogen peroxide, yeast as a source of catalase, soap and food colouring. As expected, the reaction proceeded well with a coloured soapy foam spilling out of the container. This was a good example of putting our policy (low concentrations, safer alternatives). As peroxide, even in low concentrations (6%), can cause serious damage to eyes, goggles should have been worn by the student in the video.
Hazards of 30% Hydrogen Peroxide
STAO recommends that 30 % hydrogen peroxide be only used by the teacher. Its hazards include:
- It can act as either an oxidyzing agent or reducing agent
- It is caustic
- It can decompose rapidly in the presence of catalysts
- It can rapidly decompose when exposed to metal impurities (especially multivalent)
- It can spontaneously ignite organic materials such as cotton, leather, paper towels
While these properties may seem alarming, they are common among the other oxidizers that are in our chemical inventory and used for lab activities and demonstrations. The “Teacher Use” designation should signify to teachers that the substance has a hazard level above the chemicals used for student activities. Precautions for the use of 30 % hydrogen peroxide include goggles, acid resist gloves, synthetic apron and keeping students at a safe distance from the demonstration. A self-standing chemical shield (aka explosion shield) is also reduces the risk injury without obscuring the view.
Recommended Video Resource
Evonik Industries has produced a 30-minute training video (see link below) covering the industrial use of 50 -70% hydrogen peroxide. The video provides several neat demonstrations showing rapid decomposition, reaction to impurities and spontaneous combustion. It offers several good safety tips appropriate for high school. These include:
- Never pour a decanted sample back into a stock bottle
- Store peroxide at less than 30′ C
- Store the stock bottle within a plastic tray
- Use non-organic PPE’s (not leather)
- Do not wipe spills with paper towels or natural cloths.
- Even very dilute solutions can cause serious eye damage
Chair STAO Safety Committee
1) H2O2 Safety Training Video – Evonik is a leading global manufacturer of hydrogen peroxide