Transformer Bushing Insulating Material
DL-500 transformer bushing insulating material is widely used in optical cable, high voltage, EHV XLPE cable, local communication cable,capacitor, etc.
Water blocking, low density, low acid value, corrosion resistance, excellent electric properties, and excellent oxidation resistance and resistance to fungal growth .
Main Technical Parameters
Density @ 20°C (g/ml)
Flash point (°C)
@ 25°C (dmm)
@ -40°C (dmm)
ASTM D 217
ASTM D 217
Viscosity @ 10 1/S 25°C (Pa.s)
CR Ramp 0-121/s
Oil seperation @ 80°C / 24 hours (Wt %)
Volatility @ 80°C / 24 hours (Wt %)
OIT@ 190°C (min)
Acid value (mg KOH/g)
Relative dielectric constant @ 50Hz, 23°C
Volume resistivity @ 20℃ (Ω.cm)
Dielectric power factor （1MHz）
Breakdown voltage （KV）
Expansion coefficient （℃-1）
Test with customers
DL-500 transformer bushing insulating material is well compatible with high polymer.But we recommend that the compatibility test should be made before high polymer materials are in contact with the compound.
DL-500 transformer bushing insulating material is designed for cold filling.
30% deposit ,70% balance should be paid before shipment.
20’GP : witnin 7 working days after receiving the deposit.
40’GP : within 10 working days after receiving the deposit.
Five Top Reasons Why Google Fiber Fails
The first attempt by Google Fiber to provide fiber optic networks for homes has slowly been shelved. Initially, Google Fiber was described as the most exciting project of the ISP market, but so far has not achieved its expected goal. In October, Google FiberCEO Craig Barratt announced the departure of the project and the project gradually ceased service. It is reported that due to the serious shortage of users of the project, the relevant staff will be halved. Google has adopted different strategies to build Fiber plans, such as the use of wireless Gigabit services, but the Internet and video services provided by Fiber did not attract enough users.
The following briefly analyzes the five reasons why Google Fiber failed.
I can receive marketing emails from local cable and internet providers almost every week to introduce the latest bundled transactions and encourage the author to use them. This kind of marketing has never been Google's strategy, which may take away some of Google's users. In the case of Austin, Texas, AT&T beat Google in the city and launched its rival GigaPower. The company also launched a 300 Mbps connection to the market and provided up to 1 Gbps of connectivity available. This brings a large number of users to AT&T, and has ensured these users until Fiber is actually available.
At the beginning of Google Fiber's launch, its core fiber-optic Internet service costs $70 a month, and TV services require additional fees. The company now adds a cheap, $50 per month service for 100 Mbps service. Low price can bring benefits to users and attract new users, but it does not create commercial value. The low price of Google Fiber can not bring enough profits for the company to offset the high cost. The launch of Google Fiber Services proved that its actual price is much more expensive than expected, and it takes longer, which may be the reason why Google temporarily suspended the project.
Although Google is an internet company, it is not an infrastructure company. Building infrastructure from scratch is a difficult task. Google relies heavily on fiber deployment and urban partnerships, but the lack of relationship between the company and other partners has caused the project to face many obstacles. In cities such as Louisville and Nashville, Google faces lawsuits involving the suspension of fiber optic cables from existing infrastructure (such as telephone poles). In addition, Google's lack of resources and slow development in the city led to its defeat by traditional suppliers in cities such as Austin and Charlotte. In order to offset infrastructure costs, Google has begun to focus on wireless broadband plans, but it is still unclear whether the market can meet the use of the technology.
4. Increased competition
The launch of Google Fiber led to a huge rebound from existing providers. Google is clearly a catalyst for the development of its competitors, but it may not be a good thing for Google. In the market where Google Fiber is provided, Comcast and other providers have increased their speed of competition, usually offering a similar $70-a-kilo service. In addition, companies represented by Nokia also demonstrated their ability to innovate. They claimed that they could provide faster Internet services. In the wireless field, taking Starry as an example, they provide Gigabit Ethernet download services.
Internet service providers are usually the industries with the lowest user satisfaction index in the United States. There are usually many bad services and network interruptions. However, for a new competitor and no experience in the field to enter the market, such bets are extremely high. In 2015, Google Fiber was interrupted during the world-class competition and had no service in more than two hours. Network outages are not new in the ISP space, but this serious disruption may have a devastating effect on new users, especially those on Google.