Neoprene Rubber for Gaskets and Seals

Q: What is the practical difference between commercial neoprene and 100% pure chloroprene?

Commercial neoprene is blended with SBR rubber and fillers to provide an economical general-purpose gasket for air, water, and mild weathering. In contrast, 100% pure chloroprene contains only virgin neoprene polymer, meeting ASTM D2000 BE callouts with significantly higher tensile strength and superior resistance to petroleum greases, Freon refrigerants, ozone, and chemical swelling.

Q: What continuous temperature range can solid neoprene gaskets handle?

Solid neoprene operates continuously from -30°F to 220°F (-34°C to 104°C), with specialty formulations withstanding intermittent peaks up to 250°F (121°C). For applications requiring broader thermal envelopes, silicone (-80°F to 450°F) or Viton (-15°F to 400°F) are recommended.

Q: Which Shore A durometer is standard for pipe flanges and machinery casings?

The industry standard for raised-face and flat-face ANSI pipe flanges is 60 Shore A durometer. This hardness balances surface conformity against flange tool marks with mechanical blowout resistance under pressure. Softer 40–50 durometer is used for lightweight covers, while 70–80 durometer is specified for high-pressure hydraulic casings.

Q: Can CGR Products laminate pressure-sensitive adhesives (PSA) to solid neoprene?

Yes. CGR Products uses rotary hot-roll lamination to apply high-shear, solvent-resistant acrylic transfer tapes and synthetic rubber PSAs directly to solid neoprene rolls, supplying parts with extended finger-lift liners, pull tabs, or continuous kiss-cut backings for fast assembly.

Q: What precision fabricating methods does CGR Products use to cut solid neoprene?

CGR Products converts solid neoprene using high-speed rotary die cutting for thin web-fed rolls, heavy-tonnage flatbed presses for high-volume stamped flange gaskets, and multi-head CNC waterjet cutting systems for thick slabs and high durometers without tooling dies or edge concavity.

Neoprene sheet rubber is a general purpose industrial gasket and seal material for use with non-aromatic petroleum oils and greases.

Die cut gaskets and seals are well-known as highly resilient, all-purpose synthetic rubber, Neoprene is one of the industry’s most relied-upon materials.

It performs in a multitude of industrial settings, and its resistance to degradation makes it an essential element in a number of different industries.

Neoprene is one of the most versatile materials in existence and has found a place in virtually countless applications. It features a number of important properties, including:

Excellent chemical resistance — Neoprene works well while in contact with a full range of chemicals and oils, making it a vital part of applications in even the most challenging industrial conditions.
Works in any weather or temperature — This synthetic rubber resists degradation in a full range of temperature and other outdoor conditions, maintaining integrity while in the sun, ozone, cold, or inclement weather.
Maintains its properties in any form — Whether customers need Neoprene in solid sheet, open cell, or closed cell forms, it retains its chemical- and weather-resistant properties.
Tough and resilient — Some of the properties of Neoprene rubber include excellent abrasion resistance, good tear resistance, excellent resilience, and good-to-excellent adhesion to metals. It features a tensile range of 500 to 3000 psi and a durometer range (Shore A) of 20 to 95.

The versatility of Neoprene has made it a mainstay for industrial OEM products. These include hoses, gaskets, and a full array of corrosion-resistant coatings. Neoprene is not limited to these capacities, however, and is very important in areas as diverse as electronics accessories, sports, apparel, musical instruments, and more.

Solid Neoprene Elastomer Grades & Converting Specifications

CGR Products precision converts, slits, laminates, and die-cuts solid chloroprene (Neoprene) rubber sheet and roll goods. Renowned as the industry’s premier all-purpose elastomer, solid neoprene balances mechanical resilience, moderate petroleum and refrigerant resistance, and robust atmospheric weathering. Review the comparative grade matrix below to select the optimal durometer, compound blend, and military/commercial specification for your application.

Neoprene Grade	Mechanical & Environmental Profile	Durometer & Standards
Commercial Grade Neoprene	Cost-effective chloroprene/SBR elastomer blend engineered for general industrial sealing. Offers moderate resistance to non-aromatic petroleum oils, greases, water, and atmospheric weathering. Excellent conformability under standard ANSI bolt loads across a continuous temperature range of -20°F to 190°F (-29°C to 88°C).	40 to 80 Shore A · ASTM D2000 BC · Smooth Finish · Black
100% Premium Pure Chloroprene	Formulated with 100% virgin chloroprene polymer without SBR fillers. Delivers superior resistance to oil swelling, chemical washdowns, Freon refrigerants, ozone, and outdoor weathering. Operates from -30°F to 220°F (-34°C to 104°C) with elevated tensile strength (1,500+ PSI) and long-term elastic recovery.	40 to 80 Shore A · ASTM D2000 BE · High-Tensile · Black
MIL-SPEC Neoprene (MIL-R-6855)	Certified military-specification chloroprene rubber (Class 2, Grade 40/50/60/70). Engineered for severe aviation, naval, and defense environments requiring verified resistance to synthetic oils, fuels, accelerated aging, and low-temperature flexibility down to -40°F.	40 to 70 Shore A · MIL-R-6855 Class 2 · Full Traceability · Black
Flame-Retardant Neoprene	Compounded to meet strict automotive, mass transit, and electronic fire safety mandates. Inherently self-extinguishing upon flame removal; limits smoke generation and toxic combustion byproducts while maintaining an environmental weather seal.	50 to 70 Shore A · FMVSS 302 · UL 94 HF-1 · Black
Cloth-Inserted (CI) Neoprene	Solid chloroprene reinforced internally with 1 to 4 plies of high-strength woven polyester or nylon fabric. Drastically reduces cold flow and lateral creep under heavy flange bolt torques while preventing bolt-hole tear-out in high-vibration applications.	60 to 70 Shore A · High Flange Bolt Load · Smooth / Fabric Finish
FDA Food-Grade Neoprene	Manufactured using FDA-approved ingredients for repeated contact with oily or greasy foodstuffs. Non-toxic, non-marking, odorless, and resistant to food processing animal fats and mild caustic cleaning washdowns.	50 to 65 Shore A · FDA 21 CFR 177.2600 · White / Off-White

Frequently Asked Questions: Solid Neoprene Gaskets & Converting

What is the practical difference between commercial neoprene and 100% pure chloroprene?

The primary difference lies in polymer composition and chemical resistance:

Commercial Neoprene: Blended with styrene-butadiene rubber (SBR) and hydrocarbon fillers to lower cost. It provides reliable physical toughness and seals standard water, air, and mild weathering lines, but swells and degrades faster when exposed to oils or continuous outdoor ozone.
100% Pure Chloroprene: Formulated solely with virgin neoprene polymer without SBR dilution. It meets strict ASTM D2000 BE callouts and delivers significantly superior resistance to petroleum greases, hydraulic fluids, Freon refrigerants, ozone cracking, and outdoor UV aging.

What continuous temperature range can solid neoprene gaskets handle?

Solid neoprene gaskets reliably operate across a continuous temperature range of -30°F to 220°F (-34°C to 104°C), with specialty compounds handling intermittent temperature spikes up to 250°F (121°C). For continuous applications dropping below -30°F or operating above 250°F, alternative elastomers such as solid Silicone (-80°F to 450°F) or Viton® / FKM (-15°F to 400°F) are recommended.

Which Shore A durometer is standard for pipe flanges and machinery casings?

The industry standard for flat-face and raised-face ANSI pipe flanges is 60 Shore A durometer. A 60 durometer sheet provides the optimal balance: it is soft enough to conform to surface tool marks and cast-metal imperfections under moderate bolt torque, yet firm enough to prevent blowout under line pressure. For warped or lightweight sheet-metal covers, a softer 40–50 Shore A is preferred; for high-pressure hydraulic manifolds, 70–80 Shore A is specified.

Can CGR Products laminate pressure-sensitive adhesives (PSA) to solid neoprene?

Yes. CGR Products uses wide-web rotary hot-roll lamination to apply high-shear, solvent-resistant acrylic transfer adhesives and synthetic rubber PSAs directly to solid neoprene rolls. To support high-speed manual installation or automated pick-and-place lines, we supply parts with extended finger-lift liners, pull tabs, or continuous kiss-cut backings.

What precision fabricating methods does CGR Products use to cut solid neoprene?

Depending on production volume, thickness, and dimensional tolerances, CGR Products converts solid neoprene using:

High-Speed Rotary Die Cutting: Used for thin-gauge neoprene rolls with pre-applied PSA for automated roll-fed assemblies.
Heavy-Tonnage Flatbed Presses: High-speed stamping of flange and manifold gaskets from sheet stock using precision tool-steel dies.
Multi-Head CNC Waterjet Cutting: Pure and abrasive waterjet systems slice heavy neoprene slabs (up to 1″ or thicker) and dense 70/80 durometers with zero edge concavity (“hourglassing”) and without tooling die setup costs.