Frequently Asked Questions
General Questions
What products does Square Silicone offer?
Square Silicone provides silicone materials and related solutions across a wide range of industries, including food grade, energy power, medical grade, automotive, industrial gasket and parts, optical LSR, printer roller, sportsware, textile and coating, silicone oils, additives, and silicone foam.
Which industries do your silicone materials serve?
Our silicone materials are used in energy, automotive, medical care, consumer products, electronics, and building and construction, with product categories on the website also covering food, industrial parts, optical applications, rollers, and sports-related products
How can I contact your team?
Documentation
Do you provide Technical Data Sheets?
Do you provide Safety Data Sheets?
Can I request both TDS and SDS before ordering?
Service & Support
Can you support custom requirements?
Can I request samples?
How do I choose the right silicone material?
Do you have certificates and qualification documents?
Problems Solved
I. Problem: Bubbles are found in the produced products.
Solutions:
- Caused by excessively high injection pressure or speed; try reducing the injection machine pressure or speed.
- Overly high mold cavity temperature; attempt to lower the set mold cavity temperature.
- Clogged or unreasonably designed mold venting channels; try cleaning the mold, reducing the clamping force, and deepening the venting channels.
- Air trapped in the mixer; attempt to inspect the mixer seals and purge the air from the mixer.
- Insufficient mold cavity vacuum; try checking the vacuum pump and seals for malfunctions, and extend the vacuum time.
- Uneven material feeding; attempt to balance the material feeding across all runners.
- The rubber compound itself contains excessive bubbles; perform defoaming treatment before use.
- Excessive crosslinking agent in the rubber compound; check if the hydrogen content is too high, as hydrogen gas will be generated in the presence of the catalyst, causing bubbles.
- Low viscosity of the rubber compound; appropriately increase the rubber compound viscosity or slightly reduce the injection pressure.
II. Problem: Uncured or incompletely cured mixture.
Solutions:
- Check if the curing time is too short; try extending the curing time.
- Check if the mold cavity temperature is below the process-required parameters; inspect the heaters and thermocouples, verify temperature uniformity, and shorten the mold opening time.
- May be caused by unbalanced feeding of Component A/B; check if the mixer pressure fluctuation is normal, inspect the feeding system for blockages (e.g., gel formation), and note that excessive Component B will slow down curing.
- Catalyst poisoning: The platinum catalyst has come into contact with compounds containing S/Sn/N/P, as well as organosilicon compounds with high vinyl content.
III. Problem: Scorching, overheating, or runaway reaction of liquid silicone rubber (LSR).
Solutions:
- Excessively low injection speed; try increasing the injection speed or pressure.
- Overly high mold temperature; attempt to lower the set mold cavity temperature and reduce the temperature in the cold runner.
- Excessively fast curing speed (too low TC10 value); try slowing down the curing speed.
IV. Problem: Material shortage in production line supply.
Solutions:
- Low injection pressure or speed of the equipment; try increasing the injection pressure or speed.
- Inadequate material supply; attempt to increase the flow rate of the feeding system.
- Poor venting; refer to the Solutions for Bubbles in Products.
- Overly high mold temperature causing fast curing; lower the set mold cavity temperature.
- Excessive catalyst dosage leading to fast curing; reduce the catalyst proportion.
- Blockage in the feeding system (e.g., gel formation); inspect and clean the injection unit and feeding pipes.
- Uneven material feeding across mold cavities; inspect and adjust the feeding volume of each runner, and optimize the mold design.
Applications
Do you offer food-grade silicone materials?
Do you provide energy power silicone solutions?
Do you offer medical-grade silicone?
Do you provide automotive silicone materials?
Do you support industrial gasket applications?
Do you offer optical LSR materials?
