The CLP Regulation ensures that the hazards presented by chemicals are clearly communicated to workers and consumers in the European Union through classification and labelling of chemicals. This list contains the indicative occupational exposure limit values (IOELVs) from Commission Directive 2009/161/EU. The EC Inventory is a combination of three independent European lists of substances from the previous EU chemicals regulatory frameworks (EINECS, ELINCS and the NLP-list). 1L; Glass bottle. What is the Classification and Labelling Inventory? The described Product category (i.e. N'hésitez pas à nous contacter en cas de doute ou de question. This website uses cookies to ensure you get the best experience on our websites. Si on monte le pH, on monte le TAC. Le pH moins (ou pH minus), quant à lui, est fabriqué à partir d'acide sulfurique, à un taux d'environ 35 % d'acide. Substances may have impurities and additives that lead to different classifications. 2-chlorosuccinic acid is a C4-dicarboxylic acid that is succinic acid substituted at position 2 by a chloro group. When sufficiently cool, treat the highly concentrated sulfuric acid as described above. Use descriptors are adapted from ECHA guidance to improve readability and may not correspond textually to descriptor codes described in Chapter R.12: Use Descriptor system of ECHA Guidance on information requirements and chemical safety assessment. Dangerous Goods List (RID, Chap. Relax. The use information is displayed per substance life cycle stage (consumer use, in articles, by professional workers (widespread uses), in formulation or re-packing, at industrial sites or in manufacturing). menu. A substance may have its use restricted to certain articles or products and therefore not all the examples may apply to the specific substance. Poly Bottle; 500mL. Avoid the spread of germs by promoting proper hand hygiene in your business. For a detailed overview on identified uses and environmental releases, please consult the registered substance factsheet. 7 and points 2 and 3 of the Annex to Directive 94/33/EC, to which young persons (under 18 years of age) may not be exposed at the workplace. The ‘Hazard classification and labelling’ section shows the hazards of a substance based on the standardised system of statements and pictograms established under the CLP (Classification Labelling and Packaging) Regulation. Danger! This substance has an industrial use resulting in manufacture of another substance (use of intermediates). The EC or list number is the primary substance identifier used by ECHA. L'acide fluorhydrique présente un double danger: une action corrosive et une action toxique. Sulfuric Acid OSHA Danger Safety Sign protects others from potential chemical dangers. Workplace Signage: Annexes I and III, Directive 92/58/EEC, last amended by Directive 2014/27/EU, 5 March 2014, EU. Il est miscible à l'eau en toutes proportions, où il se dissocie en libérant des cations hydronium : L'acide sulfurique pur est un liquide visqueux, incolore et inodore. This substance is used in the following products: pH regulators and water treatment products, metal surface treatment products, non-metal-surface treatment products, extraction agents and washing & cleaning products. En contact avec des métaux, de l'hydrogène gazeux peut se former (il existe un risque d'explosion). If the substance was not covered by the EC Inventory, ECHA attributes a list number in the same format, starting with the numbers 6, 7, 8 or 9. Acide sulfurique [French] [ACD/IUPAC Name] Acido solforico [Italian] ácido sulfúrico [Spanish] Ácido sulfúrico [Portuguese] H2SO4 [Formula] hydroxidotrioxidosu lfur(.) ECHA maintains the C&L Inventory, but does not review or verify the accuracy of the information. Release to the environment of this substance can occur from industrial use: manufacturing of the substance. inside a watch) or with very low concentrations considered not to pose risks to human health or the environment. The CLP Regulation makes sure that the hazards presented by chemicals are clearly communicated to workers and consumers in the European Union. Direct eye contact can result in blindness. 109286). Create a unique sign and message here! Si la piscine est vide, arrivé à partir du milieu du remplissage, mettez 1 litre de javel concentré à à 36° CHL pour 10 m3. This substance is used for the manufacture of: chemicals, metals, pulp, paper and paper products, food products and fabricated metal products. The quality and correctness of the information submitted to ECHA remains the responsibility of the data submitter. in case of consumer and professional uses). Indicative OELVs, Directive 2009/161/EU establishing a third list of IOELVs in implementation of Dir. This list contains biological and chemical agents, in accordance with Art. L’acide chlorhydrique est corrosif pour les métaux. for your research needs. 3.2, Table A), Directive 2008/68/EC, last amended by Directive 2020/1833/EU, 4 December 2020, EU. While the harmonised list covers many hazardous substances, others not listed may also meet the classification criteria in accordance with the CLP Regulation. If at least one company has indicated that the substance classification is affected by impurities or additives, this will be indicated by an informative sentence. Harmonised classification and labelling is a legally binding classification and labelling for a substance, agreed at European Community level. 2017/164/EU, 1 February 2017, EU. Grab the attention of your workers with custom header signs. Release to the environment of this substance can occur from industrial use: as processing aid. Diverses impuretés le colorent souvent en jaune brun. 6(5) - SDS and Declaration, EU Ecolabels - Restrictions for Hazardous Substances/Mixtures, Active Implantable Medical Devices Directive - Hazardous Substances, Inland Transport of Dangerous Goods Directive, Annex III - ADN, Inland Transport of Dangerous Goods Directive, Annex I - ADR, Inland Transport of Dangerous Goods Directive, Annex II - RID, In Vitro Diagnostic Medical Devices Directive - Hazardous Substances, Occupational Exposure Limits - 3rd list - Indicative OELVs, Marine Environmental Policy Framework Directive - Hazardous Substances, Medical Devices Directive - Hazardous Substances, Annexes II, III, IV, VII - Defined & Temporary Maximum Residue Levels, FCM and Articles Regulation, Annex I - Authorised Substances, General Product Safety Directive - Hazardous Substances, FCMs Recycled Plastic & Articles Regulation - Annex I - Authorised Use, Workplace Signs - minimum requirements & signs on containers and pipes, Safety and Health of Workers at Work Directive - Hazardous Substances, Waste Framework Directive, Annex III - Waste - Hazardous Properties, Fertiliser Regulation- Annex I, E.3 (chelating and complexing agents), Substances of very high concern identification, Recommendation for the Authorisation List, Getting started with EU chemicals legislation, Classification of substances and mixtures, Harmonised classification and labelling (CLH). The classifications of the substances listed in the list are based on their harmonised classifications per Table 3 of Annex VI to the CLP Regulation 1272/2008/EC. A mixture of Jo Brand and The Hungry Games. Please upgrade your Internet Explorer to a newer version. Union List of Authorised Substances: Annex I, Plastics Food Contact Regulation 10/2011/EU, as amended by Regulation 2020/1245/EU, 3 September 2020, EU. The Waste Framework Directive aims to protect the environment and human health from the generation and management of waste and to improve efficient use of resources. This list contains the Union list of authorised monomers, other starting substances, macromolecules obtained from microbial fermentation, additives and polymer production aids. It is an alpha,omega-dicarboxylic acid, a C4-dicarboxylic acid and a chlorocarboxylic acid. This information is only displayed if the substance is well–defined, its identity is not claimed confidential and there is sufficient information available in ECHA’s databases for ECHA’s algorithms to generate a molecular structure. Sigma-Aldrich offers Sigma-Aldrich-435589, Sulfuric acid (H2SO4) with density 1.840 g/mL at 25 °C(lit.) Harmonisation is based on the substance’s physical, toxicological and eco-toxicological hazard assessment. To end a "Big Brother" game called Concentration with "un cocktail Molotov une m'elange d'essence, d'acide sulfurique et de potasse" - vieille batterie de camion. Simply upload your worker's image, name, and department, and select material and quantity. 3.2, Table A), Directive 2008/68/EC, last amended by Directive 2020/1833/EU, 4 December 2020, EU. BOV . EU. This substance is used in the following products: laboratory chemicals, pH regulators and water treatment products, washing & cleaning products, metal surface treatment products, non-metal-surface treatment products and extraction agents. In these cases if there is a link to a REACH registered substance factsheet then the substance IS registered. call shopping_cart. Shop a large selection of Sulfuric Acid (H2SO4) products and learn more about Sulfuric Acid, 96% Solution in Water, Extra Pure, ACROS Organics. REACH registration dossiers have greater data requirements (such as supporting studies) than do notifications under CLP. Tool showing an overview of substances in various key regulatory processes that authorities are working on. Suivez les indications sur la boîte pour avoir les bonnes quantités d'acide sulfurique. En cas d'incendie, il peut se former des vapeurs toxiques de SOx. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners). Find product specific information including CAS, … 215–540–4, is covered by three harmonisations: 005–011–00–4; 005–011–01–1 and 005–011–02–9), CLH information cannot be displayed in the InfoCard as the difference between the CLH classifications requires manual interpretation or verification. No minimum quantities are required, no set-up fees and most importantly no additional charge for colors or logos. Non-Exhaustive List of Banned Substances, Directive 94/33/EC on Young People at Work, 20 August 1994, as amended by Dir 2014/27/EU, March 5, 2014 (Based on Table 3 of Annex VI to CLP, inter alia), EU. Acide chlorhydrique de piscine : ses usages et ses dangers This list contains: (1) the hazardous substances with harmonised classifications and labelling (i.e., Table 3 of Annex VI to CLP Regulation); and (2) the Candidate List of substances of very high concern (SVHC). This list contains the RID Dangerous Goods List, as implemented by the European Union's Directive 2008/68/EC. InfoCards are updated when new information is available. Directive 92/58/EEC requires employers to ensure proper signage is posted in areas where hazards cannot be avoided or reduced. Substances for which an agreed set of classification and labelling data has been agreed at EU level by Member States. The InfoCard summarises the non-confidential data of a substance held in the databases of the European Chemicals Agency (ECHA). Special Remarks on Corrosivity: Non-corrosive to lead and mild steel, but dillute acid attacks most metals. Eligible for FREE SHIPPING on orders over $200*, Contractor Preferred Corrugated Plastic Signs, Accu-Detect Metal-Detectable Pipe Markers, Post safety sign before entry into areas where this chemical may be used or stored, English and Spanish language options available in a variety of sizes and materials, Traditional OSHA-style signs, tags and labels are the most widely recognized design format in the industry, Danger header indicates a hazardous situation that, if not avoided, will result in death or serious injury. How does Fluoroantimonic Acid react to an iPhone 7? It covers their hazardous properties, classification and labelling, and information on how to use them safely. ECHA has no data from registration dossiers on the precautionary measures for using this substance. Substances listed in the EINECS, ELINCS, or NLP inventories. Mesurez régulièrement la valeur du pH de l'eau de piscine et soyez prudent avec l'acide sulfurique. This substance is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 10 000 000 to < 100 000 000 per annum. This Directive establishes rules for the safe transport of dangerous goods between EU countries by road (ADR) and inland waterways (ADN), and the regulations concerning the international carriage of dangerous goods by rail (RID). Xcdiscount FBMCHG014VP plastique Français Bilingue Connexion, Legend "DANGER ACIDE SULFURIQUE / DANGER Acide sulfurique", 14 "Longueur x 10" Largeur x 0,055 "d'épaisseur, Rouge / Noir sur blanc: Amazon.ca: Tools & Home Improvement Livraison rapide. The correct total tonnage band can be found in the factsheet(s) for the substance. This substance can be found in complex articles, with no release intended: electrical batteries and accumulators. This substance is used in the following areas: mining and municipal supply (e.g. This substance has been found in the following regulatory activities (directly, or inheriting the regulatory context of a parent substance): This list contains a non-exhaustive inventory based on the list of substances with harmonised classification and labelling (i.e., Table 3 of Annex VI to the CLP Regulation 1272/2008/EC). Information on precautionary measures and the safe use is submitted by the registrant of a substance and the registrant is solely responsible for its accuracy and completeness. On trouve, dans le commerce, l'acide sulfurique à diverses concentrations ; l'acide sulfurique concentré est aux envi rons de 98 %, l'acide sulfurique pour les batteries a une concentration de 33 à 34 %. 109535). This list contains substances that have been assigned hazard property (HP) waste codes 1-15, as defined in terms of the hazard class and category, hazard (H) statement, and/or concentration limits provided in Annex III of the Waste Framework Directive 2008/98/EC. Equipement de respiration autonome. Details of dossier compliance checks and testing proposal evaluation. Sulfuric acid (H 2 SO 4) reacts very vigorously with water in a highly exothermic reaction.If you add water to concentrated sulfuric acid, it can boil and spit and you may get a nasty acid burn. Aucun blessé n'est à déplorer, ni aucun danger pour la population et l'environnement. Substances according to Hazardous Waste Properties: Annex III, Directive 2008/98/EC, 22 November 2008, amended by Directive 2018/851/EU, 14 June 2018, Registration, Evaluation, Authorisation and Restriction of Chemicals, Chemical Agents Directive and Carcinogens or Mutagens Directive, Inland Transport of Dangerous Goods Directive, OELs - Occupational Exposure Limits - 3rd list, Plastic Materials and Articles Regulation, Safety and/or Health Signs at Work Directive, EC Inventory, Annexes II, III, IV, VII - Defined & Temporary Maximum Residue Levels, EU Ecolabels - Restrictions for Hazardous Substances/Mixtures, FCM and Articles Regulation, Annex I - Authorised Substances, FCMs Recycled Plastic & Articles Regulation - Annex I - Authorised Use, Workplace Signs - minimum requirements & signs on containers and pipes, Occupational Exposure Limits - 3rd list - Indicative OELVs, Annexes II, III, IV, VII - Defined & Temporary Maximum Residue Levels, EU Ecolabels - Restrictions for Hazardous Substances/Mixtures, FCM and Articles Regulation, Annex I - Authorised Substances, FCMs Recycled Plastic & Articles Regulation - Annex I - Authorised Use, Workplace Signs - minimum requirements & signs on containers and pipes, Pre-Registration process, Annexes II, III, IV, VII - Defined & Temporary Maximum Residue Levels, EU Ecolabels - Restrictions for Hazardous Substances/Mixtures, FCM and Articles Regulation, Annex I - Authorised Substances, FCMs Recycled Plastic & Articles Regulation - Annex I - Authorised Use, Workplace Signs - minimum requirements & signs on containers and pipes, CAD - Chemical Agents Directive, Art. Notre produit pH- contient la plus haute concentration d'acide sulfurique (37,5 %) qui peut être distribuée sur le marché de consommation en toute sécurité, et il est idéal pour les systèmes de dosage … Danger header indicates a hazardous situation that, if … Other release to the environment of this substance is likely to occur from: outdoor use in close systems with minimal release (e.g. The POPs Regulation bans or severely restricts the production and use of persistent organic pollutants in the European Union. Guidance on safe use - recommendations by substance registrant on the proper use of the substance in various situations. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners) and outdoor use. Welcome to the ECHA website. Prevent face-to-face interactions at close workstations in industrial, office, and commercial settings. The EC Number is the numerical identifier for substances in the EC Inventory. hydraulic liquids in automotive suspension, lubricants in motor oil and break fluids) and indoor use (e.g. Additionally, if available, information on the use of the substance and how consumers and workers are likely to be exposed to it can also be displayed here. Please note: Precautionary measures and guidance on safe use concern the use and handling of the specific substance as such, not of the presence of the substance in other articles or mixtures. The ‘Hazard classification’ and labelling section uses the signal word, pictogram(s) and hazard statements of the substance under the harmonised classification and labelling (CLH) as its primary source of information. Other relevant information includes the following: To see the full list of notified classifications and to get more information on impurities and additives relevant to classification please consult the C&L Inventory. Details of the improvements can be found at. Hazardous Substances - Article 2(b)(i), Directive 98/24/EC on Protection of Workers from Chemical Agent-related Risks, 5 May 1998 (Table 3 of Annex VI to CLP, as amended), EU. This list contains hazardous substances based on Table 3 of Annex VI to the CLP Regulation 1272/2008/EC. Shop a large selection of Sulfuric Acid (H2SO4) products and learn more about Sulfuric Acid, Certified, 2.00N ±0.02N (1.0M), LabChem™ . Information on applicable regulatory frameworks is also automatically generated and may not be complete or up to date. Make your safety message your own - don't blend in, stand out! Accidents are preventable with the proper safety messaging and signage. 5.2 Dangers particuliers résultant de la substance ou du mélange: Incombustible. Before filling into container D, check the pH with pH universal indicator strips (Cat. No. The Support section provides tools and practical guidance to companies which have responsibilities under the EU chemicals legislation. … The ‘Substance identity’ section is calculated from substance identification information from all ECHA databases. 2(b)(i) - Hazardous Agents, Construction Product Regulation - Annex I (3) - Hazardous Substances, Active Implantable Medical Devices Directive - Hazardous Substances, In Vitro Diagnostic Medical Devices Directive - Hazardous Substances, Marine Environmental Policy Framework Directive - Hazardous Substances, Medical Devices Directive - Hazardous Substances, General Product Safety Directive - Hazardous Substances, Safety and Health of Workers at Work Directive - Hazardous Substances, Waste Framework Directive, Annex III - Waste - Hazardous Properties, Fertiliser Regulation- Annex I, E.3 (chelating and complexing agents), Inland Transport of Dangerous Goods Directive, Annex III - ADN, Inland Transport of Dangerous Goods Directive, Annex I - ADR, Inland Transport of Dangerous Goods Directive, Annex II - RID, SULPHURIC ACID with not more than 51% acid or BATTERY FLUID, ACID, Construction Product Regulation - Art. The examples provided are generic examples and may not apply to the specific substance you are viewing. Member States are required to bring into force the laws, regulations and administrative provisions necessary to comply with this Directive, which establishes values for reference period of eight-hour time weighted average and for a short-term period of 15 minutes. ECHA organises consultations to get feedback from all interested parties and to gather the widest possible range of scientific information for the regulatory processes. It is possible that a harmonisation is introduced through an amendment to the CLP Regulation. Sulfuric acid exposed to air is rapidly taken up by water and produces white fumes. Minor corrosive effect on bronze. Making Site Tags™ has never been easier with our custom predesigned site tag builder! This substance is used in the following areas: mining. Note that for readability purposes, only the pictograms, signal words and hazard statements referred in more than 5% of the notifications under CLP are displayed. disodium tetraborate EC no. Pesticides. The purpose of the information provided under this section is to highlight the substance hazardousness in a readable format. These notifications can be provided by manufacturers, importers and downstream users. Precautionary statements - describe recommended measures to minimise or prevent adverse effects resulting from exposure to a hazardous product or improper storage or handling of a hazardous product. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners). This substance has an industrial use resulting in manufacture of another substance (use of intermediates). acid on most metals (i.e. Ingestion of sulfuric acid can burn the mouth and throat, and erode the stomach; death can occur. Make a statement with your own customized no header signs. The type of uses and classifications may vary between different submissions to ECHA and for a full understanding it is recommended to consult the source data. The precautionary measures and guidance on safe use are as submitted to ECHA by registrants under the REACH Regulation. When it comes to the most pressing safety issues, almost all can be pr... Production floors have unique safety issues that require specific training and safety signage. No. Emergency Overview Causes severe burns by all exposure routes. 2000/39/EC, last amended by Dir. Fuming sulfuric acid should be carefully stirred dropwise into 40 % sulfuric acid (Cat. It does not represent a new labelling, classification or hazard statement, neither reflect other factors that affect the susceptibility of the effects described, such as duration of exposure or substance concentration (e.g. This section provides links to the list of precautions (precautionary statements) and to the guidance on safe use, if they have been provided in REACH registration dossiers. The Prior Informed Consent Regulation administers the import and export of certain hazardous chemicals and places obligations on companies who wish to export these chemicals to non-EU countries. Release to the environment of this substance can occur from industrial use: as processing aid, in the production of articles, in processing aids at industrial sites, as an intermediate step in further manufacturing of another substance (use of intermediates), of substances in closed systems with minimal release and formulation of mixtures. Don't settle for just any old sign when it comes to workplace safety and compliance. This section is based on three sources for information (harmonised classification and labelling (CLH), REACH registrations and CLP notifications). REACH regulation aims to improve the protection of human health and the environment from the risks that can be posed by chemicals. This substance is used in the following products: pH regulators and water treatment products, metal surface treatment products, non-metal-surface treatment products and polymers. Need something a little different and don't want to meet specific regulations? The EU Ecolabel may not be awarded to substances or mixtures classified as such. Other release to the environment of this substance is likely to occur from: indoor use (e.g. Customize your message here! This section provides an overview of the calculated volume at which the substance is manufactured or imported to the European Economic Area (EU28 + Iceland, Liechtenstein and Norway). A substance identified primarily by an EC or list number may be linked with more than one CAS number, or with CAS numbers that have been deleted. More information about the EC Inventory can be found here. This list contains the maximum residue level (MRLs) entries as listed in the following annexes of Regulation (EC) No 396/2005 on maximum residue levels of pesticides in or on food and feed of plant and animal origin and amending Council Directive 91/414/EEC: (1) Annex II: Maximum Residue Levels; (2) Annex III: Temporary MRLs; (3) Annex IV: Active Substances for Which No MRLs Are Required; and (4) Annex VII: Active Substance/Product Combinations. Close Find out more on how we use cookies. Conseils personnels. 6. 5.3 Conseils aux pompiers: Vêtements et chaussures adéquates. The source of the information is mentioned in the introductory sentence of the hazard statements. 6(5) - SDS and Declaration, Oil of Vitriol, Sulphuric acid, Hydrogen sulphate, Battery Acid, C&L Inventory, Registration dossier, Other, Schwefelsäure 100 % Monohydrat (Sulphuric Acid), EC Inventory, C&L Inventory, Registration dossier, Pre-Registration process, Other, CAD - Chemical Agents Directive, Art. C23F11/04 — Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in markedly acid liquids FR1012474D 1949-10-04 1949-10-04 Procédé pour empêcher les aciers inoxydables d'être corrodés par l'acide sulfurique Expired FR1012474A ( fr ) Pour 4 litres de javel concentré ajoutés, mettez dans un seau rempli à moitié 1 litre d'acide chlorhydrique de super marché et jetez en une seule fois au milieu de la piscine. This substance has an industrial use resulting in manufacture of another substance (use of intermediates). This Directive applies the European Agreements on the international transport of dangerous goods by road (ADR) and inland waterways (ADN), and the regulations concerning the international carriage of dangerous goods by rail (RID). To help your business, we created 800+ COVID-19 safety identification solutions. Ensure that plenty of ice is available for cooling! DANGER! More information about Classification and Labelling is available in the Regulations section of ECHA website. See more ideas about the darkest minds, cool tattoos for guys, apocalypse aesthetic. BPR regulation aims to improve the functioning of the biocidal products market in the EU, while ensuring a high level of protection for humans and the environment. Maximum Residue Levels: Annexes II, III, IV, VII, Regulation 396/2005/EC, last amended by Regulation (EU) 2020/1565, 28 October 2020, EU. Attacks many metals releasing hydrogen. The revised Drinking Water Directive aims to protect citizens and the environment from the harmful effects of contaminated drinking water and to improve access to drinking water. If generated, an InChI string will also be generated and made available for searching. Dangerous Goods List (ADR, Chap. Some substance identifiers may have been claimed confidential, or may not have been provided, and therefore not be displayed. In that case, the ATP (Adaptation to Technical Progress) number is displayed. Dangerous Goods List (ADN, Chap. The CAS number is the substance numerical identifier assigned by the Chemical Abstracts Service, a division of the American Chemical Society, to substances registered in the CAS registry database. Release to the environment of this substance can occur from industrial use: formulation of mixtures and in the production of articles. Choose your safety signs and safety labels from custom or stock. Remind others to stand 6 feet apart with social and physical distancing signs at work stations, production facilities, checkout aisles, grocery stores, restaurants, and more. The molecular structure is based on structures generated from information available in ECHA’s databases. This Directive applies the European Agreements on the international transport of dangerous goods by road (ADR) and inland waterways (ADN), and the regulations concerning the international carriage of dangerous goods by rail (RID). The list is a non-exhaustive inventory of such substances based on: 1) agents of risk groups 3 and 4 under Directive 2000/54/EC; 2) Table 3 of Annex VI to the CLP Regulation; 3) and Annex I of Directive 2004/37/EC. Sa concentration est encore parfois expri… search (800) 237-1001 8am-7pm EST. Substances which have been registered and can be placed on the EEA market by those companies with a valid registration. The information is aggregated from the data coming from REACH substance registrations provided by industry. Registration dossier . Jun 5, 2020 - by Amélie Nothomb. While reprocessing is ongoing please note that substances whose registration dossiers are not yet processed can incorrectly state in the Infocard that they are not registered under REACH. Keep your workers safe by posting a safety sign warning of this dangerous chemical.