Sheet Molding Composite

Sheet Molding Compound is a sheet composite material made of glass fiber, unsaturated polyester resin, low shrinkage additives, fillers and additives. Through the compression molding process, it can be made into high-strength, lightweight and corrosion-resistant parts, which are widely used in automobiles, construction, electronics and other fields, replacing traditional metal or plastic materials.

SMC Sheet Molding Compound Parameters:

Features

1. High mechanical strength

Tensile strength ≥50MPa, flexural strength ≥120MPa, flexural modulus ≥9GPa, can withstand complex stress environments.

2. Corrosion resistance

Passed the salt spray test ≥1000 hours, suitable for humid, acid and alkali environments.

3. Electrical insulation

Volume resistivity ≥1×10¹³Ω·cm, breakdown voltage ≥20kV/mm, to ensure the safety of electronic equipment.

4. Lightweight

The density is only 1/4 of steel and 2/3 of aluminum, reducing transportation and energy consumption costs.

5. Design flexibility

Supports complex geometric shape molding, tolerance control ±0.1mm, to meet the needs of precision components.

6. Environmental protection

Halogen-free, heavy metal-free, RoHS-compliant, recyclable ≥ 90%.

Application scenarios

Automotive industry

Scenario: body panels, hoods, battery boxes, bumpers and other parts.

Solution:

SMC density is 1.88g/cm³, 60% lighter than steel, improving fuel efficiency;

Temperature resistance range is -40℃ to 120℃, adapting to extreme climates;

Impact strength is ≥50kJ/m², passing C-NCAP collision test.

New energy field

Scenario: electric vehicle battery pack shell, charging pile shell.

Solution:

Flame retardant grade V-0 (UL94 standard), self-extinguishing time from fire ≤3 seconds;

Insulation performance ensures battery pack safety, withstand voltage ≥10kV;

Color difference ΔE≤1.5 after weather resistance test (1000 hours UV aging).

Buildings and infrastructure

Scenario: lightning protection equipment, cable racks, water tanks, manhole covers.

Solution:

Water resistance (water absorption rate ≤ 0.3%) to avoid corrosion in humid environments;

Load-bearing capacity ≥ 5 tons/m², meeting the needs of municipal roads;

Surface flatness ≤ 0.2mm, suitable for decorative coating.

Electronic and electrical

Scenario: high-voltage switch cabinet insulation partition, motor end cover, distribution box.

Solution:

Dielectric constant 3.5-4.5, loss tangent ≤ 0.02, reduce signal interference;

Arc resistance ≥ 180 seconds to ensure the safety of high-voltage equipment;

Dimensional stability (thermal expansion coefficient ≤ 3×10⁻⁵/℃) is suitable for precision instruments.

Railway transportation

Scenario: train interior panels, seat frames, equipment doors.

Solution:

Flame retardant performance passes EN 45545-2 HL3 standard;

Smoke density ≤ 75 (NBS standard), reducing fire hazards;

Fatigue resistance (10⁶ cycles without cracks) adapts to high-frequency vibration.

Shipbuilding and marine engineering

Scenario: cabin interior, engine room partitions, hull guard plates.

Solution:

Seawater corrosion resistance (5 years without rust);

Low-temperature toughness (-40℃ impact strength ≥30kJ/m²);

Anti-slip surface (friction coefficient ≥0.6) to ensure personnel safety.

Environmental protection and public facilities

Scenario: sewage treatment equipment, garbage bins, ventilation ducts.

Solution:

Chemical corrosion resistance (no damage to pH 2-12 media);

Antibacterial rate ≥99% (Escherichia coli, Staphylococcus aureus);

Easy-to-clean coating (contact angle ≥110°) to reduce maintenance costs.

Cleaning and maintenance guide

Daily cleaning:

Use a soft cloth dipped in a neutral detergent (pH 6-8) to wipe, and avoid detergents containing alcohol or solvents.

Oil stains can be treated locally with rosin water, but they must be rinsed with clean water and wiped dry immediately.

Protective measures:

Avoid scratches with sharp objects. Surface scratches with a depth of ≤0.1mm can be repaired with sandpaper (600 mesh).

When exposed to ultraviolet light for a long time, reapply UV protective agent every 2 years.

Repair and replacement:

Cracks or breaks require replacement of the entire component, and the interface is sealed with structural adhesive (shear strength ≥15MPa).

Aged components (surface cracks, discoloration) need to be replaced as a whole to avoid safety hazards.

Storage conditions:

Unused SMC sheets should be stored in a dry environment (humidity ≤50%), at a temperature of 5℃-30℃, and avoid direct sunlight.

After opening, they must be used within 6 months, and the remaining parts should be wrapped and sealed with moisture-proof paper.

FAQs

Q1: Is SMC environmentally friendly?

A: RoHS-compliant, halogen-free, heavy metal-free, and recyclable at a rate of ≥90%.

Q2: Can the color and texture be customized?

A: Support RAL color card customization, minimum order quantity 500kg, delivery cycle 15-20 days.

Q3: Does the molding temperature affect the performance?

A: The molding temperature is 130℃-155℃, and the temperature fluctuation within ±5℃ has no effect on the performance.

Q4: How is the weather resistance?

A: After 5 years of outdoor use, the color difference ΔE≤3, and the tensile strength retention rate ≥85%.

Q5: How long is the service life?

A: More than 15 years for indoor use and 8-10 years for outdoor use (depending on environmental differences).