Technical Data Sheet for SMC/DMC

Sheet /Dough Molding Compounds

Type：Mechanical, Electrical

Introduction：SMC is Sheet Molding Compounds, and BMC is Bulk Molding Compounds (DMC is Dough Molding Compounds). SMC & BMC (DMC) are advanced composite materials manufactured by a special process, which employs unsaturated polyester resin, glass fiber, filler, low shrink agent, curing agent, releasing agent, and other assistants.

Referenced Standard

JB/T 7770-1995

Applications

Reliable flame resistance, arc resistance, and reliable dimensional stability. This product can be molded at a low pressure in a short period. Widely used in electrical fields, automobile field, civil construction, and railway industry.

Properties

Unit

Value

Grade

SMC－1

SMC－2

SMC－3

DMC－1

DMC－2

DMC－3

Density

g/cm³

1.75-1.95

Water absorption

mg

≤20

≤20

—

≤20

≤20

—

Molding shrinkage ratio

%

≤0.15

≤0.15

≤0.30

≤0.15

≤0.15

≤0.30

Heat distortion temperature
（Method A）

℃

≥240

≥240

≥220

≥240

≥240

≥220

Impact strength
(Charpy in-notched)

KJ/m²

≥90

≥60

≥45

≥30

≥25

≥20

Flexural strength

MPa

≥170

≥150

≥135

≥90

≥80

≥70

Insulation resistance

Under normal conditions（A）

Ω

≥1.0×10¹³

≥1.0×10¹³

≥1.0×10¹²

≥1.0×10¹³

≥1.0×10¹³

≥1.0×10¹²

Immerged in water for 24 hours(D-24/23)

≥1.0×10¹²

≥1.0×10¹²

—

≥1.0×10¹²

≥1.0×10¹²

—

Dielectric strength（in 90℃ oil）

MV/m

≥12.0

≥12.0

≥10.0

≥12.0

≥12.0

≥10.0

Dissipation factor (1MHz)

—

≤0.015

≤0.015

—

≤0.015

≤0.015

—

Permittivity（1MHz）

—

≤4.5

≤4.5

—

≤4.8

≤4.8

—

Arc resistance

S

≥180

≥180

≥150

≥180

≥180

≥180

Proof tracking index (PTI)

V

≥600

≥600

≥600

≥600

≥600

≥600

Flammability

—

FV0

FV0

—

FV0

FV0

—

Temperature index

—

155

155

130

155

155

130

Note: Nominal Area of SMC and DMC sheets is 1000×2000mm²