35 Shore A Silicone Mold Making Rubber with High Tear Strength and 1:1 Mix Ratio for RTV2 Silicone Rubber Casting

Product Description:

6250-43MJ is a two-part platinum-cured silicone for mold making. It vulcanises at room temperature, so no oven or heated press is needed, and the addition-cure system gives low shrinkage and reproducible detail from the first pull to the hundredth.

At 25,000 mPa·s mixed viscosity it flows into fine undercuts and surface texture without trapping air, which is what decides whether a mold reproduces the original or loses the detail. Typical uses are prototypes, decorative castings and industrial parts.

Tensile strength is 8 MPa and tear strength 20 kN/m. The tear figure is the one that matters for mold life: it decides how many demoulding cycles a thin undercut survives before it starts to nick and tear.

The hardness of this silicone mold making rubber is rated at Shore A 35, striking an excellent balance between flexibility and firmness. This moderate hardness level allows the mold to be flexible enough for easy demolding of complex shapes, while still maintaining sufficient rigidity to support detailed features and structural integrity. This versatility makes it suitable for a wide range of mold making tasks, from delicate artware to robust industrial components.

Platinum cure keeps shrinkage low and dimensions stable, which is what a multi-part mold needs: the two halves have to line up after every cycle. It suits prototypes, artware, decorative concrete and industrial castings.

Furthermore, the room temperature vulcanizing capability of this silicone mold making rubber simplifies the mold production process. Users can cure the material at ambient conditions without the need for additional heating equipment, reducing both time and energy costs. This feature also expands the range of environments in which the material can be used, making it highly adaptable for different workshop settings and production scales.

 In summary, 6250-43MJ combines a 35 Shore A hardness, 8 MPa tensile, 400% elongation and 20 kN/m tear with a 25,000 mPa·s mixed viscosity and a 30-minute pot life at 25 °C. It is built for repeated demoulding, not for one-off castings.

The grade is supplied as two components at 1:1 by weight, so mixing is a scale job rather than a formulation job, and the 30-minute pot life leaves enough working time for large molds without dragging the demould time out.

Features:

• Product Name: Silicone Mold Making Rubber 6250-43MJ
• Curing Type: Platinum-Catalysed Addition Cure, Room Temperature Vulcanising
• Hardness: Shore A 35
• Mixed Viscosity: 25,000 mPa·s
• Mix Ratio: 1:1 by Weight (A:B)
• Pot Life: 30 minutes at 25 °C
• Pot Life: 30 min at 25 °C
• Elongation at Break: 400%
• Tear Strength: 20 kN/m
• ackaging: 20 kg / 200 kg Drums, Part A and B Separately

Technical Parameters:

Applications:

6250-43MJ is a mold making silicone made in Guangzhou, Guangdong, China. It is supplied as two components packed separately, and it is intended for industrial, art, craft and jewellery mold making only.

At Shore A 35 it is soft enough to strip a deep undercut by hand and firm enough to hold a straight wall. The transparent appearance lets you see air bubbles and stone alignment while the mold is still open, and the 1:1 by weight ratio keeps mixing simple.

This grade is not intended for food-contact use. It is a mold making material for plaster, concrete, resin and wax casting, and for candle and soap molds that are not used with food. If you need a food-contact mold silicone, tell us at enquiry stage and we will quote the food-grade series instead.

20 kN/m tear strength is what carries thin undercuts and sharp internal corners through repeated demoulding. It is the reason this grade holds up in jewellery casting, art casting and prototype work, where the mold has to survive dozens of pulls without losing detail.

 In summary, 6250-43MJ is a 35 Shore A platinum-cure mold silicone for concrete, resin, wax and plaster work. It is not for food contact; choose it for detail reproduction and mold life, not for culinary use.

Packing and Shipping:

The material is supplied as two components. Part A and Part B are packed separately in 20 kg pails or 200 kg drums, each sealed and labelled with the batch number and production date. Store at room temperature in a dry, ventilated area away from direct sunlight; shelf life is 12 months. Keep the components away from compounds containing N, P, S, Sn or Pb, which deactivate the platinum catalyst.

For shipping, we use reliable carriers and provide tracking information to keep you informed about your order status. We offer various shipping options to meet your needs, including standard and expedited services. All shipments are handled with care to ensure your Silicone Mold Making Rubber reaches you safely and promptly.

FAQ:

Q1: What is the brand and model number of this silicone mold making rubber?

A1: The silicone mold making rubber is from the brand RUIHE, and the model number is 6250-43MJ.

Q2: Where is this product manufactured?

A2: This silicone mold making rubber is manufactured in Guangzhou, Guangdong, China.

Q3: What compliance does 6250-43MJ come with?

A3: The material is REACH and RoHS compliant, and the factory holds ISO 9001. COA, TDS and MSDS are supplied with each batch.

Q4: What is the minimum order quantity and packaging details?

A4: The minimum order quantity is 20 Kg. The product is packaged in 20 Kg per pail, with Part A and Part B packed separately.

Q5: What are the delivery time and payment terms?

A5: The delivery time is 7-15 working days. Payment terms are T/T with a 30% deposit before production and the balance paid before shipment.

Q6: Can I use this silicone for chocolate or cake molds?

A6: No. 6250-43MJ is not a food-contact grade and must not be used for chocolate, cake or any mold that touches food. For culinary molds, ask us for the food-grade mold silicone series.

Q7: How long is the pot life and how much working time do I get?

A7: Pot life is 30 minutes at 25 °C from the moment A and B are mixed. Warmer workshops shorten it, so mix in small batches for large molds.