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UPR for SMC, BMC

SMC (Sheet Molding Compound) resin and BMC (Bulk Molding Compound) resin are widely used in the composite materials industry. SMC resin comes in sheet form, offering excellent dimensional stability and high strength. It is suitable for manufacturing large, complex parts. BMC resin, in bulk form, features good flowability and is cost - effective. Both resins can be molded under heat and pressure, finding applications in automotive parts, electrical enclosures, and construction components due to their durability and versatility.

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Changzhou Original Chemical Co., Ltd


Unsaturated Polyester Resins for SMC / BMC

SMC (Sheet Molding Compound) resin and BMC (Bulk Molding Compound) resin are widely used in the composite materials industry. SMC resin comes in sheet form, offering excellent dimensional stability and high strength. It is suitable for manufacturing large, complex parts. BMC resin, in bulk form, features good flowability and is cost - effective. Both resins can be molded under heat and pressure, finding applications in automotive parts, electrical enclosures, and construction components due to their durability and versatility.


The characteristic of smc resin and bmc resin:

Molding Forms：SMC resin is presented in sheet form, which is pre - impregnated with reinforcement materials. This form allows for easy handling and molding into large - sized, complex shapes. BMC resin, on the other hand, exists in bulk. Its granular or dough - like consistency enables it to be easily dispensed and processed in various molding operations.


Mechanical Properties：Both SMC resin and BMC resin offer high strength - to - weight ratios. SMC resin, due to its continuous fiber reinforcement in the sheet, often provides enhanced tensile and flexural strength, making it ideal for structural applications. BMC resin, while having a different reinforcement distribution in its bulk form, still delivers good mechanical properties, especially impact resistance.


Molding Process：SMC resin is typically molded using compression molding. The pre - formed sheets are placed in a mold, and heat and pressure are applied to shape the final product. BMC resin can be processed through compression molding as well, but it is also suitable for injection molding because of its better flowability in the bulk state.


Cost - effectiveness：BMC resin is generally more cost - effective in terms of raw material and processing for small - to - medium - sized parts. Its bulk nature allows for easier handling in large - volume production. SMC resin, although more expensive in some cases due to the manufacturing process of the sheets, offers long - term cost savings for large - scale, high - performance applications where its superior mechanical and dimensional stability properties are crucial.


Name

Type

Viscosity
(25℃)

Tg

Characteristics and applications

BY-1319

Ortho

-

≥140

High reactivity,good mechanical strength and toughness, good heat and electric properties, Recommended for SMC / BMC application

BY-1317

Ortho

-

≥135

High reactivity, readily be thickened with magnesiun oxide, good heat and mechanical strength. Recommended for SMC / BMC application

BY-1318

Ortho

1000-1500

≥145

High reactivity, readily thickened with magnesium oxide, good mechanical strength and toughness. Recommended for SMC / BMC application.

BY-1316

Ortho

1200-1400

≥140

High reactivity, readily thickened with magnesium oxide, good water resistance, mechanical strength and toughness. Recommended for SMC / BMC application.

BY-1320

Hi-activity

2000-2600

≥150

High reactive resin for SMC / BMC, readily thickened with magnesium oxide, suitable for low profile SMC, BMC formulations of encapsulating ware micrometers, automotive parts etc.

BY-1321

Ortho

800-1000

≥135

Readily be thickened with magnesium oxide for antimony paste.

BY-1322

Ortho

600-800

≥140

Medium viscosity, high reactivity and heat resistance. Suitable for SMC / BMC formulations of electric applications, industrial parts and automotive parts etc.

BY-1323

Hi-activity

550-650

≥150

Medium viscosity, high reactivity, good heat resistance. Suitable for low profile and class A SMC formulation combined with high polymer solution. Recommended for productions of electric, industrial and automotive parts etc.

BY-1324

Hi-activity

1450-1850

≥150

High reactivity, readily thickened with magnesium oxide. Recommended for the production of low profile and class A application.

BY-1325

Hi-activity

1450-1480

≥150

High reactivity, readily thickened with magnesium oxide. Recommended for the production of high surface quality applications.

BY-1352

Hi-activity

600-800

≥150

Specially design for SMC / BMC formulations with high surface gloss. High reactivity, readily be thickened with magnesium oxide, good water and heat resistance. Recommended for the production of sanitary, automotive parts etc.

BY-1327

ISO

1500-2000

≥135

High reactivity, good electric properties and mechanical strength. Recommended for SMC / BMC products of encapsulating micrometer, automotive parts, electric applications etc.

BY-1328

PTA / NPG

-

≥135

High reactivity, good pigmentation and readily thickened with magnesium oxide, high mechanical strength, good electric properties and heat resistance. Recommended for SMC / BMC productions of electric application, industrial parts etc.

BY-1329

ISO / NPG

2500-3000

≥135

High reactivity, high mechanical strength, good electric properties and chemical resistance. Recommended for SMC / BMC productions of electric application, industrial parts etc.

BY-1330

ISO / NPG

1600-2000

≥135

High reactivity, readily thickened with magnesium oxide, suitable for products with good mechanical strength, good electrical property, good heat and chemical resistance of VARTM / mould pressing SMC / BMC, applied in the field of electrical parts and industrial equipment.

BY-1331

Ortho

-

≥135

Good water and heat resistance, good electrical property, suitable for vehicle and electrical parts of SMC / BMC products.

BY-1332

ISO / NPG

1000-1500

≥135

High reactivity, high mechanical strength, good electric properties and heat, chemical resistance. Recommended for SMC / BMC productions of electric application, sanitary ware, industrial parts etc.

BY-1333

ISO / NPG

6000-8000

≥135

High reactivity, high mechanical strength, good electric properties and chemical resistance with low shrinkage. Recommended for SMC / BMC productions of electric application, industrial parts etc.


Keywords
high reactivity unsaturated polyester resin,UPR for SMC,UPR for BMC
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