KLINGER® top-chem 2000: The Sealing Solution Built for the Toughest Chemical Environments

By KLINGER GPI | 6/16/2026

When it comes to sealing aggressive media in chemical plants, the stakes are high. A failed gasket can mean unplanned downtime, environmental incidents, or serious personnel hazards.

Engineers at chemical processing facilities need sealing materials they can trust — materials that perform reliably across wide temperature and pressure ranges while standing up to corrosive acids, solvents, and alkalis. top-chem 2000 was engineered specifically for these demanding conditions. With 30 years of proven field performance, it delivers the chemical resistance, mechanical integrity, and operational safety that process engineers require — with a track record that keeps facilities running and workers protected.

What is KLINGER® top-chem 2000?

top-chem 2000 is a universal, heavy-duty PTFE gasket sheet material manufactured by KLINGER. Its basis is PTFE (polytetrafluoroethylene) filled with SiC (silicon carbide) — a formulation that delivers exceptional performance in applications with high mechanical requirements at elevated temperatures. Critically, it is the only PTFE gasket material with a Fire-Safe Certificate (acc. to DIN EN ISO 10497), making it uniquely positioned for facilities where fire safety compliance is a plant requirement.

Chemical Resistance: Engineered for Aggressive Media

The chemical environments inside a processing plant are rarely forgiving. Flanges may see concentrated sulfuric acid one week and caustic soda the next. top-chem 2000 is formulated for strongly acidic and alkaline applications, as well as steam and oxygen service. Its chemical resistance extends across a broad spectrum of media, including:

     » Strong acids - including sulfuric acid (H₂SO₄, 100%), hydrochloric acid, and nitric acid (HNO₃, 100%)

     » Alkalis and caustic solutions - including sodium hydroxide (NaOH, 33%) and potassium hydroxide

     » Steam and oxygen - validated service conditions, not just theoretical compatibility

     » Hydrocarbons and process fluids - oils, fuels, and general chemical process media

     » Water and aqueous solutions - including water treatment applications

The PTFE-SiC matrix resists degradation in chemically hostile environments where conventional gasket materials would blister, swell, or lose sealing integrity. Immersion testing data published in the product data sheet confirms minimal thickness and weight increase even after sustained exposure to concentrated acids and strong caustics.

This material also meets FDA conformity and Regulation (EU) No. 1935/2004, making it suitable for chemical service in food-grade and pharmaceutical process lines — a differentiator that expands its applicability beyond pure industrial chemical service.

Safety First: Reducing Risk in Chemical Processing

Process safety is non-negotiable. top-chem 2000 is designed to support plant safety objectives through multiple performance characteristics:

» Fire-Safe certification - top-chem 2000 holds a Fire-Safe Certificate in accordance with DIN EN ISO 10497. For chemical plants operating under OSHA PSM or EPA RMP requirements, this certification provides documented evidence that the gasket material meets fire safety performance standards — critical for risk assessments and regulatory audits.

» Exceptional creep and cold flow resistance - One of the primary failure modes in PTFE gaskets is cold flow under sustained bolt load. top-chem 2000 was specifically engineered to overcome this limitation. Its stress relaxation data (DIN 52913) demonstrates retained sealing load of 28 MPa at 150°C and 36 MPa at 260°C — confirming that bolt load is maintained over the service life of the joint.

» High retention of bolt load - The material’s consistent composition and resistance to ageing ensure that the gasket continues to perform reliably over time, without the progressive loss of sealing force that degrades other gasket materials in high-temperature service.

» TIghtness to DIN 28090-2 - top-chem 2000 achieves a tightness value of 0.08 mg/s·m to DIN 28090-2, providing engineers with a quantified leakage rate for engineering calculations and flange joint integrity assessments.

Reliability Built Into Every Sheet

KLINGER GPI backs top-chem 2000 with comprehensive technical documentation, including third-party test certificates, tightness data, and chemical resistance tables. Each production batch is manufactured under ISO-compliant quality control processes, ensuring consistent material properties sheet to sheet. When you specify top-chem 2000, you are specifying a material that will perform to the same standard every time it is installed.

The material’s resistance to ageing is a key long-term reliability differentiator. Unlike organic-binder-based gasket materials that degrade over time at elevated temperatures, PTFE-SiC construction maintains its mechanical and chemical properties throughout the service life of the joint. As KLINGER production engineers note, a top-chem 2000 gasket correctly installed decades ago would still be sealing effectively today.

The Right Choice for Chemical Service

Plant engineers working in chemical processing environments face constant pressure to balance safety, reliability, and cost. top-chem 2000 is designed to deliver on all three. Its superior chemical resistance, fire-safe certification, documented low creep performance, and long service life make it a technically sound specification for flanged joints in corrosive service across a wide range of industries, including petrochemicals, specialty chemicals, pharmaceuticals, pulp and paper, and water treatment.

The ability of a gasket to make and maintain a seal depends not only on the style and quality of the gasket material, but also on medium being sealed, the flange design, the amount of pressure applied to the gasket by the bolts and how the gasket is assembled onto the flanges and tightened. These factors are beyond the manufacturer's control.