Quick answer: Chemical companies should treat cyber security as a safety issue as well as an IT issue. The core best practices are separating business IT from plant operational technology (OT), protecting safety instrumented systems, tightly controlling remote and vendor access, keeping an accurate asset inventory, monitoring OT networks, and running joint IT, OT and process safety incident drills. Multinationals also need consistent standards across every site.
A cyber attack on a chemical plant can do more than leak data. It can stop production, damage equipment or interfere with systems that keep hazardous processes safe. That is why the chemical sector is classed as critical infrastructure in many countries. This guide sets out practical best practices for large and multinational chemical organizations.
IT vs OT security in chemical operations
| Area | IT environment | OT environment |
|---|---|---|
| Main priority | Confidentiality of data | Safety and availability of the process |
| Typical systems | ERP, email, R&D data | DCS, PLCs, SCADA, safety instrumented systems |
| Patching | Frequent and routine | Planned around shutdowns and vendor approval |
| Main risks | Ransomware, IP theft, phishing | Process disruption, unsafe conditions, downtime |
The two environments need different approaches. Controls that are routine in IT, such as rebooting to patch or running aggressive scans, can disrupt sensitive control systems, so OT changes must be planned with engineering and safety teams.
Best practices
- Segment IT from OT. Use the zones and conduits model from ISA/IEC 62443; our guide to cyber security zones and conduits explains how.
- Protect safety systems. Keep safety instrumented systems isolated and monitor any connection to them.
- Know your assets. Maintain an inventory of controllers, versions and network connections at every site.
- Control remote access. Route vendor and engineer access through jump hosts with multifactor authentication and approval.
- Monitor OT networks. Use passive monitoring that understands industrial protocols.
- Patch and harden carefully. Follow vendor guidance and use compensating controls where systems cannot be patched.
- Protect intellectual property. Formulas and process data are prime targets for espionage; apply strict access control and data loss prevention.
- Manage suppliers. Assess the security of integrators and equipment vendors; see supply chain attack vectors.
- Drill incident response. Exercises should include IT, OT, process safety and site leadership.
Challenges for multinational chemical companies
- Different local regulations and reporting rules in each country.
- Acquired sites with legacy control systems and mixed standards.
- Shared global networks that can spread an incident across regions.
A global baseline, regional implementation teams and regular site assessments help keep standards consistent. A gap analysis per site shows where each one stands.
CISA provides sector-specific resources for the chemical sector, and the ISA/IEC 62443 series is the main standard for industrial automation security. Defense in depth is explained in our guide to layered cyber security.
Frequently asked questions
Why is cyber security important in the chemical industry?
Attacks can disrupt production, threaten safety systems and steal valuable intellectual property, with consequences for people, the environment and the business.
Which standard applies to chemical plant cyber security?
ISA/IEC 62443 is the most widely used standard for industrial control systems, often combined with the NIST Cybersecurity Framework at enterprise level.
Can chemical plants patch control systems regularly?
Often not on an IT schedule. Patches are usually applied during planned shutdowns after vendor testing, with compensating controls in between.
Who should own OT security?
Responsibility is usually shared between a central security team, site engineering and process safety, with clear accountability set by leadership.
Conclusion
For chemical companies, cyber security protects people and processes, not only data. Separate IT from OT, guard safety systems, control remote access and rehearse joint responses. Apply one global standard across every site, and close the gaps site by site.
