Why does the mold appear oily?

The silicone itself does not emit oil. Oiliness is caused by adding composite silicone oil (mixed with white mineral oil) during operation, as white mineral oil is a petrochemical product.

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

This happens if the original model is not ground or polished, or if the release agent is not applied evenly. The mold will replicate any imperfections of the original model.

What are the wonderful usages of mold silicone?

It is widely used in toy, gift, furniture, character reproduction, building decoration, resin crafts, candles, plastics, stationery, gypsum crafts, glass products, and sculpture industries.

High Quality RTV-2 Condensation Silicone Rubber

Name: High Quality RTV-2 Condensation Silicone Rubber
Brand: Dongguan gangtian polymer materials Co.Ltd.
SKU: 2011143655

Guangdong, ChinaDongguan gangtian polymer materials Co.Ltd.

US$5.50

50-499 kg

US$5.30

500-999 kg

US$4.60

1,000-4,999 kg

US$4.50

5,000+ kg

Sample price:US$1.00/kg.Request sample

Product profile

Customization

Available

Material

Silicone

Application

Household, Medical, Industrial, Agricultural, Mold Making

Model NO.

GTSIL-T10 ~ GTSIL-T40

Certification

ISO, FDA, REACH, RoHS

Component

Part a + Part B (Two Component)

Mixing Ratio

100:2, 100:3, 100:5

Customiation Service

Color, Package

Shrinkage - %

Around 0.2%

Free Samples

Yes

Shipment

by Air, by Sea, by Train

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 less than 0.1% ensuring high precision in replication.

Long Shelf Life: Maintains stability for up to 18 months when stored properly.

Excellent Heat Resistance: Resists heat, acid, alkali, and aging for durable performance.

Customizable Color and Package: Color and packaging can be customized to meet specific needs.

Free Samples Available: Free samples are provided upon request for quality verification.

Multi-Shipment Options: Flexible shipping via Air, Sea, or Train to suit logistics needs.

FDA and ISO Certified: Meets international standards including FDA, REACH, and RoHS.

Low Viscosity for Easy Mixing: Ensures smooth pouring and easy de-molding for simple molds.

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: ≤6.20h 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?

Common reasons include adding too much silicone oil which destroys molecular weight, adding too much catalyst (more than 2% for condensation cure) 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 which generate great heat. You must demould the product within 3 minutes to avoid burning. Our rubber includes special materials to resist high temperatures.

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

As a condensation silicone rubber, it solidifies by absorbing moisture from the air. 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 (recommend no more than 5%, ideally 2%), or using the mold prematurely before it cures for 24 hours.

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.