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Views: 1 Author: Site Editor Publish Time: 2025-11-10 Origin: Site
Weather resistance: Excellent resistance to ozone, ultraviolet radiation and temperature changes, maintaining stability in the range of -40℃ to 120℃. It is not easy to age, crack or harden when used outdoors for a long time.
Chemical resistance: Resists erosion by most acids, alkalis, salts and polar solvents, and is compatible with common lubricants and coolants.
Sealing performance: Good elasticity and compression set resistance, can maintain effective sealing under long-term compression, and has low water absorption (less than 1%).
Electrical insulation: Excellent dielectric properties, suitable for electrical equipment sealing and insulation protection.
Environmental friendliness: Does not contain heavy metals or harmful plasticizers, meets international environmental standards such as RoHS, and is non-toxic and odorless.
| Industry Field | Specific Application Parts | Core Functions |
|---|---|---|
| Construction Industry | Door and window gaps, curtain wall joints, building expansion joints, glass mounting seams | Waterproof, dustproof, sound insulation, thermal insulation, energy saving |
| Automotive Industry | Door and window seals, trunk seals, engine compartment seals, sunroof seals | Waterproof, dustproof, sound insulation, shock absorption, wind noise reduction |
| Electrical Industry | Electrical cabinet doors, instrument enclosures, battery pack seals | Dustproof, waterproof (IP rating protection), moistureproof, electrical insulation |
| Mechanical Equipment | Mechanical equipment covers, pipeline connections, valve seals | Sealing, shock absorption, corrosion resistance to working media |
| Household Appliances | Refrigerator door seals, air conditioner enclosures, washing machine door gaps | Sealing, thermal insulation, noise reduction, moistureproof |
Formula design: According to the use environment, adjust the ratio of ethylene-propylene monomers, vulcanizing agents, reinforcing agents and plasticizers. For example, increase the ethylene content to improve weather resistance, or add carbon black to enhance wear resistance.
Extrusion molding: Control the temperature of the extruder barrel (generally 80-120℃) and the extrusion speed to ensure uniform cross-section, smooth surface and no bubbles or cracks of the product.
Vulcanization process: Adopt continuous vulcanization (steam or hot air vulcanization) with temperature controlled at 150-180℃ and time adjusted according to product thickness. Full vulcanization ensures the elasticity and durability of the sealing strip.
Post-processing: Carry out trimming, deburring and surface treatment (such as flocking or coating) to meet the assembly requirements and improve the friction resistance or adhesion of the product surface.
| Inspection Indicator | Standard Requirement | Test Method |
|---|---|---|
| Hardness | 50-70 Shore A (adjustable according to application) | Use a Shore hardness tester to measure at 3 different points on the product surface and take the average value |
| Tensile strength | ≥10 MPa | Cut standard dumbbell-shaped samples and test with a tensile testing machine at a speed of 500 mm/min |
| Elongation at break | ≥300% | Same as tensile strength test, record the elongation when the sample breaks |
| Compression set | ≤30% (after 22 hours at 70℃) | Compress the sample to 25% of its original thickness, keep it at constant temperature, and measure the recovery rate after releasing the pressure |
| Weather resistance | No obvious cracking, hardening or discoloration after 1000 hours of UV aging | Use a UV aging test chamber to simulate outdoor environment and observe the appearance and performance changes |
| Waterproof performance | No water leakage under specified pressure | Install the sealing strip on the test fixture and conduct a water pressure test (pressure ≥0.3 MPa) |
Causes: Improper cross-sectional design, insufficient compression ratio, uneven product thickness.
Solutions: Optimize the cross-sectional structure to match the assembly gap, ensure the compression ratio is 20%-30%, and strengthen the control of extrusion and vulcanization processes to ensure uniform thickness.
Causes: Inferior raw materials, incomplete vulcanization, lack of anti-aging additives.
Solutions: Use high-purity EPDM raw rubber, add anti-aging agents (such as carbon black, UV absorbers) to the formula, and strictly control the vulcanization temperature and time.
Causes: Contaminated product surface, improper surface treatment, mismatched adhesive.
Solutions: Clean the surface of the sealing strip before assembly, carry out surface activation treatment (such as plasma treatment), and select a dedicated adhesive compatible with EPDM.
Causes: Excessive plasticizer content, insufficient vulcanization degree, unreasonable filler ratio.
Solutions: Adjust the formula to reduce plasticizer dosage, optimize vulcanization parameters to improve vulcanization degree, and select high-quality reinforcing fillers.
