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1. Why does mold silicone have a low number of molding cycles?

Silicone rubber is not inherently good or bad; it's simply a matter of suitability. Using a high-hardness mold silicone for small, intricately patterned products will result in fewer molding cycles because the silicone becomes brittle and prone to breakage. Conversely, using a low-hardness mold silicone for large products will also yield unsatisfactory results; the silicone will be too soft, reducing its tensile and tear strength, leading to deformation and fewer molding cycles. If the silicone itself is of good quality, using a hardness appropriate for the product will prevent this issue.

2. Why does burning occur in silicone molds?

Because unsaturated resins and resin products, after adding a peroxide curing agent, generate significant heat during the resin reaction. The typical resin curing time is 3 minutes; demolding should be done promptly after this time to prevent burning of the silicone mold.

3. Molding and segmented mold making methods for mold silicone:

Segmented mold or sheet mold method: Apply degassed silicone using brushing or pouring methods. If using a brushing method for sheet molds or segmented molds, first apply a release agent or separating agent to the product or model to be duplicated. Then, brush the silicone onto the product (Note: ensure even coating). After 30 minutes, apply a layer of gauze or fiberglass cloth to increase strength, then apply a second layer of silicone. After the silicone dries, create the outer mold using materials such as plaster or resin.

Pouring or injection molding method: This method is suitable for relatively smooth or simple products. The product or model to be duplicated is enclosed with a rubber plate or glass plate, and the degassed silicone is poured directly onto the product. After the silicone dries and sets, the product is removed, and the mold is complete (Note: injection molding typically uses softer silicone for easier demolding and to prevent damage to the product inside the silicone mold). This is the entire process of using and operating mold silicone.

4. Why does the phenomenon of surface drying but not internal drying occur in mold silicone?

Mold silicone is a condensation type silicone that cures by absorbing moisture from the air. If the moisture is evaporated during the manufacturing process without adding the appropriate amount of water, this phenomenon will occur. Solution: This is not a product quality issue, but rather a result of not controlling the moisture content. Increasing the silicone's storage life and shelf life can lead to this phenomenon. Simply adding 0.05% water and mixing thoroughly when using the silicone can resolve this issue.

5. Why does the mold exhibit poor tensile strength?

During mold making, to reduce silicone viscosity and ease handling, customers often add excessive silicone oil. This softens the silicone, resulting in poor tensile strength, reduced tear strength, and decreased overall tensile strength. This leads to less durable molds, shorter lifespan, and fewer molding cycles.

6. Why does oiling occur in the mold?

Mold silicone itself does not produce oil. Oiling occurs due to the addition of compound silicone oil (a mixture of silicone oil and white mineral oil) during processing. White mineral oil is a petrochemical product, not silicone oil.

7. Why do molds exhibit poor acid and alkali resistance and poor aging resistance?

When making silicone molds, it is recommended to avoid adding any silicone oil. If necessary, the amount of silicone oil added should not exceed 5%–10%. Excessive silicone oil addition can damage the molecular weight of the silicone, resulting in molds with poor acid and alkali resistance and poor aging resistance.

8. Why do silicone molds exhibit surface marks, streaks, and roughness?

This phenomenon occurs if the product or model to be duplicated has not been sanded or polished. If the model or product itself is not smooth or perfect, even the best silicone will produce an unaesthetic and rough mold if the product or model hasn't been sanded or polished. Another possibility is uneven application of release agent, which can also cause mold roughness.