Frequently Asked Questions about Sustainability
We receive lots of questions about our Sustainability policy and credentials. Most of these can be answered by referring to the NSG Group Sustainability Report however we have highlighted some of the key ones below. If you would like further help please email us using the contact form.
1. How much CO₂is released during the float glass manufacturing process?
The principal emissions from the float process are to air and arise as products of the combustion of fuel and as carbon dioxide from the decomposition of the limestone and dolomite used in the process. The flat glass manufacturing process emits approx 0.8kg CO₂per kg glass sold from both direct (fossil fuels and carbonate decomposition) emissions and indirect (electricity generation) emissions. Approximately 0.3kg CO₂are released per kg glass sold during the extraction, processing and transportation of the raw materials to our sites. Therefore, approximately 1.1kg CO₂is released in order to manufacture 1.0kg of non-processed, glass. Further energy is required for toughening, laminating and coating. The CO₂emitted during transportation to the customer varies depending on the distance and mode of transportation. Since its invention by Pilkington, major environmental improvements have been made in the float glass process. Emissions have been reduced significantly and substantial reductions have been made in energy consumption. Glass production will inevitably remain energy-intensive. We work hard to minimize energy input, so that the usage of glass contributes net benefit to sustainable development.
2. How much CO₂can be saved using our products?
Float glass manufacture is an energy consuming process, but many of our products reduce energy consumption when used in buildings. It is important to consider this overall balance when assessing environmental impact. The manufacture of one square meter of low-e double glazing leads to the emission of 25 kg CO₂. However, the CO₂saved by replacing one square meter of single glazing with low-e double glazing in a typical European building is 91kg per year, offsetting the CO₂emitted during manufacture after only 3.5 months in use.
Energy Conservation in Buildings
Energy issues are key to the building glass industry, as glass products can make an important contribution to combating climate change. In our largest market, Europe, research suggests that glass can help to attain the ambitious goal set by the European Union heads of state and government to reduce CO₂emissions by at least 20 percent by 2020. Different types of glass we have developed over the years, especially low-emissivity double glazing and solar control glazing, can significantly reduce the need for heating and cooling in buildings, thereby reducing energy consumption and associated CO₂emissions.
CO₂emissions and solar control glazing
In regions where the ambient temperature is often uncomfortably hot, the increasing tendency, as people aspire to a better lifestyle or have more disposable income, is to install air conditioning and that of course brings with it an energy and carbon burden. In that case, the primary objective is to keep heat out. Residential and non-residential buildings that use more energy than necessary to stay cool are a major source of unnecessary CO₂emissions.
The potential for solar control glass to cut CO₂emissions from buildings has been analyzed by the Dutch scientific institute TNO in a study undertaken for Glass for Europe. Solar control glass allows sunlight to pass through glazing while radiating and reflecting away a large degree of the sun’s heat. The indoor space stays bright and much cooler than would be the case if normal glass were used. The TNO study concluded that between 15 and 80 million tonnes of CO₂emissions
annually — roughly between 5 percent and 25 percent of the European Union target — could be avoided by the year 2020 by optimal use of solar control glass alone.
3. Has the NSG Group introduced a policy to measure and report on its transportation carbon footprint?
In North America, our glass for building products is manufactured in Lathrop, CA, Ottawa, IL, Rossford, OH and Laurinburg, NC. Where possible, we source raw materials locally where suppliers can meet demanding quality and procurement requirements.
4. Is timber responsibly sourced?
We have targets to improve sustainability sourcing, which are set out in the NSG Group Sustainability Report.
5. What % of fossil fuels is used in the production of glass products?
Information on the environmental performance of all sites is collected using our Airsweb multilingual global database. The data collected shows that 8% of the total energy used in glass manufacturing came from electricity in 2007 and 2008. During that period, 92% of total energy used in glass-making sites came from the direct burning of fossil fuels.
For both environmental and financial reasons and wherever practicable, the NSG Group uses natural gas as the fuel of choice for glass melting. The second most utilized fuel is heavy fuel oil. Diesel oil and liquid petroleum gas as fuels are used as back-up fuels in case of the failure of the preferred fuel. Diesel oil is also widely used to power small engines and boilers.
6. What percentage of product is reusable?
There is no reason why a window or other glass structure could not be reused. However, in many constructions the frame and size of glazing units are built to custom specification, which would limit re-use in this form. Having said that, most window and glazing materials can be re-used in some form.
7. What percentage of the product is recyclable?
Glass is 100% recyclable. One of the significant sustainability advantages of glass as a material is that, unlike many other materials, it can be recycled indefinitely. The only real constraint in glass-making terms is color. While it is possible to use clear glass cullet in the production of colored glass it is not practicable to do the reverse. However, this does not mean that all glass products can be recycled easily. Removal, segregation and transport impacts can affect the viability and environmental impact of recycling. The level of contamination determines if the glass will be used in the float, container, fiber glass or aggregate industries.
Aluminum and steel components from Pilkington Planar™ systems are also 100% recyclable.
8. How much recycled content is there in the product?
Internal cullet (recycled glass feedstock) accounts for approx 25% of the product. All edge trimming and any quality failing glass is remelted. Cullet is also a useful raw material for other parts of the glass industry, particularly the glass container sector. Up to 95 percent of waste glass from processing (cutting, manufacture of glazing units etc.) is recycled in some way.
Coated glass (low-e, self-cleaning, etc.) can also be recycled through conventional means and is capable of being recycled into the float process where required.
Glass for recycling is a valuable resource. Wherever practicable we recycle any glass off-cuts or cullet within our own glass melting lines. Glass from our downstream operations and from those of our customers represents a potentially useful resource to us. We gain a double benefit from the use of such cullet.
Firstly, the use of cullet to make glass reduces the requirement for raw materials and of course avoids the problem of disposing of what would otherwise be a waste material. Secondly, there is a net energy saving and consequent reduction in emissions since it takes less energy to melt glass than to melt the equivalent quantity of raw materials.
In 2007, the NSG Group bought in 197,900 tonnes of cullet to supplement cullet from our own internal recycling (approx 4% of glass sold).
9. Is the product made from renewable materials?
The major components of glass are sand and sodium carbonate. Although not rapidly renewable, they are some of the planet’s most abundant materials.
10. Does the NSG Group have a policy to reduce packaging?
We aim to eliminate or minimize the amount of packaging used to deliver products to customers. Specialized floatliner vehicles are used where possible to eliminate the need for packaging. Returnable metal and a small proportion of recyclable wooden stillages are used where this is not possible. Cardboard spacers can be returned to us and reused.
11. What percentage of the product of biodegradable?
Zero percent : Glass is an inert product that will not biodegrade.
12. What is the typical component replacement interval?
Glass is inherently stable and will exceed the lifetime of the building.
Replacement is normally driven by building design, breakage or window framework failure rather than a failure in the glass itself. Product specific warranties are available upon request.
13. Does the NSG Group have a certified management systems?
ISO 9001 Quality Management Systems
All glass manufacturing sites are independently certified to ISO9001:2000 quality management system. This ensures maximum yields and minimal waste throughout the supply chain.
ISO14001 Environmental Management Systems
All of the Group's global glass manufacturing sites have an externally verified ISO14001:2004 environmental management system. This ensures that all local legislation and significant environmental impacts are identified. Certification demonstrates that employees are trained in the necessary procedures to meet the legislative requirements and continually reduce their impact on the environment.
Copies of the certificates can be found on the NSG Group website
Health & Safety Management System
The health, safety and wellbeing of all employees, contractors, visitors, neighbors and customers remain at the forefront of our business activity. The NSG Group’s safety policy is based on the premise that all accidents are preventable. The NSG Group has well developed safety education and training programs, and safety statistics are carefully monitored. We measure safety performance using two key performance indicators. The Lost Time Injury Rate (LTIR) records work-related accidents or illnesses preventing individuals involved being able to report for work on the following day or shift. These are expressed as a rate per 200,000 hours (approximately the time worked by 100 people in one year). The LTIR was 0.25 in 2009; an improvement of 14 percent.
Additional information can be found on the NSG Group website
14. Does the NSG Group products contain hazardous substance?
In most cases, the finished product does not contain hazardous substances. Glass is produced from non toxic, naturally occurring substances (sand, limestone, dolomite etc.) Glass is an inert material. Hazardous substances may be used during the subsequent processing of the glass. These are carefully managed on our sites to ensure no harmful release to the environment and are rendered harmless in the final product. The Group is active in ensuring that its most critical supplies are REACH compliant.
Coatings are all based on oxide materials which are naturally occurring and stable. On-line coatings are deposited onto the glass at high temperature to form hard durable coatings on the surface of the glass between 15 and 350 nm in thickness. The coatings are all designed to pass standards which test the coatings durability to high temperatures and humidity, corrosive atmospheres (sulphur dioxide and salt spray) as well as abrasion to ensure the coatings are not damaged or release materials in service. The only exception to this is Pilkington Activ™ self-cleaning glass. In this product the titanium dioxide surface acts as a photo catalyst accelerating the decomposition of organic dirt on its surface. This process is not harmful and accelerates the decomposition of dirt into carbon dioxide and water vapor. The coated surface is not used up or changed as part of this process as it is a catalytic process.
15. Do our products contain VOCs?
Volatile Organic Compounds or VOCs are not used in the manufacture of flat glass. Although VOCs may be used during the back painting process, there are no VOCs present in the finished product.
16. Has the NSG Group identified key environmental impacts and set targets to reduce them?
Today glass manufacturing produces very little waste material thanks to the development of the float glass process by Pilkington in the 1950’s. This revolutionary process reduced the need for millions of gallons of water and completely eliminated the generation annually of thousands of tons of grinding waste that was produced from older glass manufacturing processes. Our current state of the art facilities recycle 100% of our trimmed glass and our waste is limited to maintenance activities and off spec raw material. If glass cannot be reused in our manufacturing process is sent for recycling where feasible.
17. Does the NSG Group have a responsible sourcing policy?
The NSG Group is working closely with key raw material suppliers to ensure that materials are responsibly sourced both to protect and enhance the environment and to ensure the safety and wellbeing of supplier employees.
NSG Group Procurement has functional level policies and procedures that follow the NSG Group Code of Conduct but relate more specifically to the operating practices of the Procurement function. The NSG Group aims to enjoy the highest reputation worldwide for the professional, legal and ethical way in which it conducts its business. The overriding intention of the NSG Group Supplier Code of Conduct is that our suppliers will carry out their business in a safe, professional, legal and ethical manner and in a way that demonstrates corporate social responsibility. In order to provide materials or services to NSG Group, suppliers are required to comply with this Code of Conduct.
Social behavior : All suppliers must conform to the relevant International Labor Organisation Labor Standards as a minimum requirement. This means suppliers must strive to apply employment standards which promote the application of human rights. There should be no intentional discrimination for recruitments, promotions, job transfer, dismissal and other employment related activities on the basis of race, color, creed, nationality, age, gender, sexual orientation, religion, origin, disability, union membership, political affiliation or other status protected by law. Local laws on age discrimination must be observed. Abuse, harassment or intimidation will not be tolerated under any circumstances nor will the act of pressurizing or retaliating against the individual who reports such harassment. While these general principles are applicable to all of our suppliers, each specific case should be carefully reviewed with reference to the law in each of the countries in which they operate.
Environmental Behavior : Our suppliers must recognize the crucial importance of their role in reducing environmental impact. They must play their part in creating a prosperous and sustainable future by continually seeking to achieve best practice in environmental protection.