澳洲幸运10开奖号码

澳洲幸运10开奖平台

澳洲幸运10号码

澳洲幸运10龙虎和走势图

澳洲幸运10官方开奖

澳洲幸运10娱乐平台

澳洲幸运10最新开奖结果

澳洲幸运10大小玩法

//
Epoxy Casting Tips
Submit an Inquiry
Sample / Quote

ISO 9001:2015 Certified

Epoxy compounds are used to cast various shapes and sizes of components. Although epoxies are relatively simple to use, there are some basic steps that must be followed to establish a trouble free casting operation.

 

澳洲幸运10公式

  • Processing limitations
  • Tool (mould) design
  • Viscosity
  • Reactivity
  • Exotherm
  • Vapour pressure
  • Shrinkage
  • Expansion characteristics
  • Thermal shock capabilities
  • Thermal stability characteristics

 

澳洲幸运10龙虎走势图

Consideration must be given to the availability of appropriate processing equipment. Epoxy systems are available to suit hand casting, automated casting, heat curing and higher temperature (oven) curing. Epoxy compounds may contain fillers or may be unfilled liquids.

 

澳洲幸运10注册

The following are the basic considerations for tool design in casting with epoxy compounds:

  • The pour hole should be located for the shortest path into the cavity being filled.
  • Provide vent openings to allow air to escape as the epoxy fills the cavity. Air vents should be provided for all areas where air might be trapped such as flat surfaces and around intricate inserts.
  • A reservoir of material should be available to draw from as the epoxy shrinks during the gellation process. Most often the reservoir will be located over the pour hole which is usually the largest opening into the mould.
  • Avoid sharp corners and undercuts wherever possible as these are areas conducive to air entrapment.
  • Provide uniform wall thickness (mass) throughout the tool to allow for uniform heating and to prevent large temperature variations due to different rates of cooling.

 

 

澳洲幸运10开奖结果

The lower the mixed viscosity the easier it is to process the epoxy. The mixed viscosity of two component epoxy compounds can be reduced significantly by separately heating the resin and hardener prior to mixing together or warming the mixture itself.

Storing materials containing fillers under heat will require constant agitation to prevent filler settling and the possibility of an off ratio mix. Heating will normally result in shorter pot life.

 

澳洲幸运10官方开奖结果

"For every 10oC rise in temperature the reaction rate doubles" This means that for every 10oC rise in temperature, the pot life (the time during which the mixture remains pourable) is reduced by (half) 50%. For example; if an epoxy system is formulated to gel (become firm) in 30 minutes at 25oC (77oF), then if warmed to 35oC (95oF) it will gel in approximately 15 minutes.

 

澳洲幸运10开奖预测

Exotherm is the heat generated by the compound, above the cure temperature, during the reaction. The amount of heat (exotherm) generated depends on the epoxy formulation and the (mass) amount of product being reacted at one time. The exotherm generated by resins and/or hardeners heated to reduce the viscosity will be greater than without the application of heat. As a general rule, fast reacting epoxy systems generate higher exotherm during the reaction.

 

澳洲幸运10结果走势图

If a curing epoxy system becomes too hot, it will generate gas bubbles which, if the bubbles form just before gellation (hardening), can become trapped in the structure. Vapour pressure is also a key consideration for the use of vacuum to remove air from the epoxy mixture. Certain key ingredients such as accelerators or portions of the curing agent itself can be stripped out of the mixture under vacuum.

 

澳洲幸运10安卓手机软件

Shrinkage is the reduction in volume during cure. Excessive shrinkage will cause internal stresses and serious degradation in the performance of the solidified epoxy. Epoxy systems containing fillers shrink less than unfilled epoxies. As a rule, the higher the filler content the lower the shrinkage. Providing a reservoir of product to replenish the shrinking epoxy improves the end result.

 

澳洲幸运10开奖

This must be considered especially if the casting contains embedded component such as inserts within the cured epoxy. Large differences between the expansion characteristics of the epoxy and the embedded inserts can be the cause of cracking and reduced thermal cycling abilities. In general, the more flexible the cured epoxy the more it will expand and the higher the filler content the lower the rate of expansion.

 

澳洲幸运10官方直播

The higher the elongation capabilities of the cured epoxy the better the thermal shock capabilities. Unfortunately, highly flexibilized systems exhibit rather poor thermal stability. The epoxy system must be formulated to achieve a suitable compromise between cured hardness, tensile strength and elongation to achieve the desired characteristics for the application.

 

澳洲幸运10开奖号码记录

The thermal stability of a cured epoxy system is its ability to operate at elevated temperature while maintaining a specified set of minimum properties. A common test method to determine thermal stability is % weight loss in a period of time at a given temperature.

Since every manufacturing process is somewhat unique and the parts manufactured must meet different performance requirements, it is not possible to provide hard and fast rules that could apply to all processes and materials. The following is a general set of trade-offs caused by specific changes in the handling of epoxy compounds:

 

Disclaimer
The above information is general in nature and is based solely on experiences by Crosslink Technology Inc. The recommendations provided herein may not be applicable in all situations. They are provided to the recipient as part of our customer service and the user must determine the relevance of the information to his/her application, considering any limitations that may be applicable thereto. Crosslink Technology Inc. does not accept any liability for direct or consequential damages resulting from the the implementations of these recommendations or the use of this information.

This email address is being protected from spambots. You need JavaScript enabled to view it.

Get in touch with our experts about your processing issues and needs!

Phone: (+1) 905.673.0510
Toll free North America: 1.800.563.3769
6430 Vipond Drive,
Mississauga, ON L5T 1W8. Canada

Follow Crosslink Technology Inc. on LinkedIn  Follow Crosslink Technology Inc. on Twitter  Follow Crosslink Technology Inc. on YouTube 

澳洲10开奖历史 秒速飞艇预测 快乐飞艇官方网址