Why does the mold appear oily?

The oil comes from composite silicone oil (silicone oil mixed with white mineral oil) added during operation, not from the silicone rubber itself.

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

This occurs if the original model is not polished or if the release agent is not applied evenly.

What are the wonderful usages of mold silicone?

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

Room Temp Vulcanized Platinum Silicone Rubber for Mold Making Epoxy Resin Products

Name: Room Temp Vulcanized Platinum Silicone Rubber for Mold Making Epoxy Resin Products
Brand: Dongguan gangtian polymer materials Co.Ltd.
SKU: 2005942525

Guangdong, ChinaDongguan gangtian polymer materials Co.Ltd.

US$7.68

1-199 Pieces

US$7.38

200-99,999,999 Pieces

US$3.88

100,000,000+ Pieces

Sample price:US$1.00/kg.Request sample

Product profile

Customization

Available

Material

Silicone

Application

Household, Medical, Industrial, Agricultural, Mold Making

Model NO.

GTSIL-P30

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

28-30 Shore a

Shrinkage - %

Below 0.1%

Free Samples

Yes

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% for high precision replication.

Excellent Fluidity: Viscosity of 6000-9000 Cps ensures easy pouring and detail capture.

High Tear Strength: Tear strength ranges from 20-23 KN/m2 for durable molds.

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

Customizable Color: Color customization service is available for specific needs.

Multi-Application Scope: Suitable for household, medical, industrial, and agricultural uses.

Comprehensive Certifications: Certified by ISO, FDA, REACH, and RoHS for safety and quality.

Free Samples Available: Free samples can be provided upon request.

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: ≤6.11h 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 could the silicone mold be reused only for a few times?

Reasons include adding too much silicone oil which destroys molecular weight, adding too much catalyst (over 2% for tin catalyst) which reduces tension, or using wrong hardness for the product design.

Q:Why does the silicone mold get burnt out?

This happens when using unsaturated resin which generates heat. You must demould within 3 minutes. Our rubber includes special materials to resist high temperature.

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

This is due to condensation silicone absorbing moisture. Solution: Add 0.05% water and stir briefly at low speed before use.

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

Causes include adding too much silicone oil, adding too much catalyst (over 5%), or using the mold prematurely before 24 hours. Using an outer mold is also recommended.

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 and short service life.