Why does the mold appear oily?

The silicone itself does not emit oil. The oil is caused by adding composite silicone oil (silicone oil mixed with white mineral oil) during operation.

Why does the silicone mold have traces, streaks, and unevenness on the surface?

This happens if the original model is not smooth or polished, or if the release agent was not applied evenly. The mold replicates the surface condition of the original model.

What are the wonderful usages of mold silicone?

It is used in toy, gift, furniture, character reproduction, building decoration, resin handicrafts, candle crafts, plastic toys, gypsum crafts, glass products, and sculpture industries.

PU Crafts

Name: None Oily Two Part Liquid Mold Making Silicone Rubber for Epoxy Resin/Polyurethane/Plastic/PU Crafts
Brand: Dongguan gangtian polymer materials Co.Ltd.
SKU: 2006543885

Guangdong, ChinaDongguan gangtian polymer materials Co.Ltd.

US$7.88

1-199 Pieces

US$7.68

200-99,999,999 Pieces

US$3.88

100,000,000+ Pieces

Sample price:US$7.68/kg.Request sample

Product profile

Customization

Available

Material

Silicone

Application

Household, Medical, Industrial, Agricultural, Mold Making

Model NO.

P40

Certification

ISO, FDA, REACH, RoHS

Component

Part a + Part B (Two Component)

Mixing Ratio

1:1, 10:1, 9:1

Customiation Service

Color, Package

Hardness Shore a

38-42 Shore a

Viscosity - Cps

4000-6000

Shrinkage - %

Below 0.1%

Free Samples

Yes

Tear Strength - Kn/M2

12-16

Tensile Strength - MPa

3.5-5.5

Elongation - %

300-450%

Shipment

by Air, by Sea, by Train

Factory or Not

Yes

Transport Package

1kg/Drum, 5kg/Drum, 20kg / Drum 25kg/Drum

Specification

liquid silicone rubber

Trademark

Gangtian

Origin

Dongguan, Guangdong

HS Code

3910000000

Production Capacity

600 Tons Per Month

Key features

Low Shrinkage Rate: Shrinkage is below 0.1% ensuring high precision in mold replication.

Excellent Durability: High tear strength (12-16 KN/m2) and tensile strength (3.5-5.5 MPa) for long service life.

Customizable Color: Color customization service is available to meet specific requirements.

Long Shelf Life: Product maintains stability for up to 18 months under proper storage.

Multi-Application Support: Suitable for epoxy resin, polyurethane, plastic, and PU crafts mold making.

Fast Sample Delivery: Samples can be shipped within 1-3 days after payment receipt.

Certified Safety: Holds ISO, FDA, REACH, and RoHS certifications for safe usage.

Flexible Mixing Ratios: Available in 1:1, 10:1, and 9:1 mixing ratios for different needs.

Company profile

Dongguan gangtian polymer materials Co.Ltd.

Guangdong, China

CertifiedBusiness Type: Manufacturer/Factory CertifiedR&D Capacity: ODM Service Available & OEM Service AvailableExport Year: 2016-08-08 CertifiedNearest Port: Guangzhou Port, Shenzhen PortAverage Response Time: ≤6.25h CertifiedTerms of Payment: LC, T/T, PayPal, etc.

AI-Powered supplier vetting

SummaryDongguan Gangtian Polymer Materials Co., Ltd. is identified as a China-based manufacturer of silicone and polymer materials, established in 2011, with 59 employees and a 6,000 m² manufacturing plant. Its product portfolio includes RTV 2 silicone rubber, LSR, silicone oil, silicone ink, pigments, and electronic potting compounds. The supplier reports more than 10 production lines and annual capacities totaling 6,900 tons across listed products, as well as exports since 2016 with 21%–30% of sales from exports. It holds an ISO 9001:2015 certificate and reports six R&D engineers and six to ten quality-control staff. The information supports strengths in certification, product breadth, production scale, and international market experience. However, the provided evidence does not sufficiently establish financial credibility, customization capability, or specific customer cases. After-sales capability is indicated by a stated focus on after-service but is not documented in operational detail.

Supplier typeThe supplier is explicitly identified as a manufacturer and as a professional manufacturer of RTV 2 liquid silicone rubbers. Its company type is also described as a limited company, with operations in Dongguan, Guangdong, China.

CertificationsThe supplier holds an ISO 9001:2015 certificate for supplier management systems. This is explicit evidence of a formal quality-management certification.

R&D capabilityThe supplier describes an R&D focus on innovation, reports six R&D engineers, and states that it has developed performance-enhancing silicone solutions. These statements support an established R&D function, although no patents, laboratories, or quantified R&D results are provided.

Production capacityThe supplier reports more than 10 production lines, a 6,000 m² manufacturing plant, and product capacities of 2,500 tons each for tin and platinum silicone rubber, 1,000 tons for silicone oil, 800 tons for electronic potting compound, and 100 tons for pigment. It also states production capacity above 500 tons per month, indicating substantial manufacturing capability.

Product Q&A

Q:Why can the silicone mold be reused only for a few times?

Common reasons include adding too much silicone oil which destroys molecular weight, adding excessive catalyst (more than 2% for tin catalyst) which speeds up operation and reduces strength, or using the wrong hardness for the product design.

Q:Why does the silicone mold get burnt out?

This occurs when using unsaturated resin materials that generate high heat. You must demould the product within 3 minutes. Our rubber includes special materials to resist high temperatures.

Q:Why does the silicone mould appear dry outside but wet inside?

This is a condensation silicone rubber that solidifies by absorbing moisture. To fix this, add 0.05% water and stir briefly at low speed before use.

Q:Why is the tear strength of silicone molds weak?

Weakness is caused by adding too much silicone oil, adding excessive catalyst (recommended max 5%, ideally 2%), or using the mold prematurely before the recommended 24-hour curing period.

Q:Why does the mold silicone have poor tension?

Adding large amounts of silicone oil to reduce viscosity makes the rubber too soft, resulting in poor tensile strength, short service life, and fewer mold turnovers.