In the vast landscape of industrial and commercial materials, few are as versatile and indispensable as the Rubber Sheet. This fundamental product serves as a critical component in countless applications, from sealing and gasketing to sound dampening and protective flooring. At Kaxite, we have dedicated decades to perfecting the formulation, manufacturing, and application of high-performance rubber sheeting, understanding that reliability is non-negotiable in sectors where failure is not an option. This guide delves into the technical specifications, material varieties, and practical applications of rubber sheeting, providing the detailed information engineers, procurement specialists, and project managers need to make informed decisions.
A Rubber Sheet is a flat, uniformly thick piece of synthetic or natural rubber, engineered to possess specific physical and chemical properties. Its performance is not a matter of chance but a result of precise compounding—the science of blending raw polymers with various additives like fillers, plasticizers, curatives, and anti-aging agents. This process allows manufacturers to tailor sheets for extreme temperatures, aggressive chemicals, high-pressure environments, or demanding mechanical stresses. Kaxite's expertise lies in this precise customization, ensuring each sheet delivers consistent, predictable performance.
Selecting the right rubber compound is paramount. Below is a breakdown of the most common elastomers used in sheeting, each with a unique profile.
To ensure precision in selection, here are the detailed technical parameters for two of our most popular Kaxite rubber sheet grades. These tables provide a clear, at-a-glance comparison of key performance metrics.
| Parameter | Test Method | Typical Value | Units |
|---|---|---|---|
| Hardness | ASTM D2240 | 70 ±5 | Shore A |
| Tensile Strength | ASTM D412 | 17 | MPa (min) |
| Elongation at Break | ASTM D412 | 350 | % (min) |
| Compression Set (22 hrs @ 70°C) | ASTM D395 | 25 | % (max) |
| Oil Resistance (ASTM Oil #3, 70 hrs @ 100°C) - Volume Change | ASTM D471 | +10 | % (max) | Temperature Range (Continuous) | — | -30°C to +100°C | °C |
| Standard Sheet Dimensions | — | 1m x 1m, 1.2m x 1.2m, 1.5m x 1.5m | — |
| Available Thickness | — | 1mm, 2mm, 3mm, 5mm, 6mm, 10mm, 12mm | mm |
| Parameter | Test Method | Typical Value | Units |
|---|---|---|---|
| Hardness | ASTM D2240 | 60 ±5 | Shore A |
| Tensile Strength | ASTM D412 | 12 | MPa (min) |
| Elongation at Break | ASTM D412 | 400 | % (min) |
| Compression Set (22 hrs @ 70°C) | ASTM D395 | 20 | % (max) |
| Weathering & Ozone Resistance | ASTM D1149 / D518 | Excellent | Rating |
| Water Resistance (70 hrs @ 100°C) - Volume Change | ASTM D471 | +5 | % (max) |
| Temperature Range (Continuous) | — | -50°C to +150°C | °C |
| Standard Sheet Dimensions | — | 1m x 1m, 1.2m x 10m (roll) | — |
| Available Thickness | — | 1mm, 2mm, 3mm, 5mm, 6mm, 10mm | mm |
Q: How do I choose the right rubber sheet material for my application?
A: The selection is primarily driven by the operating environment. Identify the key challenges: temperature extremes, exposure to oils/chemicals, need for UV/ozone resistance, mechanical load (tension, compression, abrasion), and any regulatory requirements (e.g., FDA, UL). Cross-reference these needs with the material property tables. For instance, for an outdoor seal exposed to sunlight and rain, EPDM is ideal. For an oil sump gasket, Nitrile (NBR) is necessary. Kaxite's technical team can assist with this analysis.
Q: What does "Shore A Hardness" mean, and why is it important?
A: Shore A is a standard scale measuring the indentation hardness of softer plastics and elastomers. A lower number (e.g., 50) indicates a softer, more compliant material, while a higher number (e.g., 80) indicates a harder, more rigid material. Hardness affects sealing force, conformability, and wear resistance. Softer sheets seal better on rough surfaces but may extrude under high pressure. Harder sheets offer better physical strength and resistance to extrusion.
Q: Can rubber sheets be customized in terms of size, thickness, and color?
A: Yes, absolutely. While Kaxite stocks standard sheet sizes and thicknesses, we offer extensive customization. Sheets can be die-cut to specific shapes, skived to precise non-standard thicknesses, and produced in various colors for coding or aesthetic purposes. Custom compounding is also available for applications requiring unique property balances not met by standard grades.
Q: How is the tensile strength of a rubber sheet tested and why does it matter?
A: Tensile strength is tested per ASTM D412, where a dumbbell-shaped specimen is stretched until it breaks. The maximum force per unit area is recorded. This property indicates the material's inherent strength and its ability to withstand stretching forces without tearing. It is crucial for dynamic applications like diaphragms, belts, or seals that experience pulling forces.
Q: What is "compression set" and why is it a critical parameter for seals?
A: Compression set measures a material's ability to recover its original thickness after being subjected to a constant compressive deformation for a set time and temperature (e.g., 22 hours at 70°C). A low percentage (like 20%) indicates excellent recovery, meaning the seal will maintain its sealing force over time. A high compression set means the material has permanently deformed and may leak. It is arguably one of the most important properties for static sealing applications.
Q: How should I store rubber sheets to ensure their longevity before use?
A: Rubber sheets should be stored in a cool, dark, dry place away from direct sunlight, ozone generators (like electric motors), and heat sources. Ideal storage temperature is between 10°C and 25°C (50°F and 77°F). Sheets should be laid flat, not folded or hung, to prevent permanent creasing or deformation. Avoid contact with sharp objects, oils, solvents, and heavy metals like copper and manganese.
Q: Are Kaxite rubber sheets suitable for potable water or food contact applications?
A: Kaxite produces specific grades of rubber sheeting, particularly in silicone and EPDM compounds, that are formulated to meet relevant standards for potable water (e.g., WRAS, NSF/ANSI 61) and food contact (e.g., FDA CFR 21, EU Regulation 10/2011). These sheets use certified ingredients and are manufactured under controlled conditions. Always specify this requirement when inquiring to receive the appropriate grade.
Q: What is the difference between calendered and molded rubber sheets?
A: Calendered sheets are produced by passing compounded rubber through a series of heavy rollers to achieve a uniform thickness and smooth surface. This is efficient for large volumes and standard thicknesses. Molded sheets are produced by pressing compound in a heated mold (platen press). Molding can create sheets with more precise dimensional tolerances, fabric reinforcements, or intricate surface patterns. Kaxite utilizes both methods depending on the product specification and order requirements.
