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Quick Details

  • Type: Other Heat Insulation Materials, Ropes
  • Place of Origin: Zhejiang, China (Mainland), Zhejiang, China (Mainland)
  • Brand Name: GYSM/ruifeng
  • Model Number: FD101/FD102
  • product: Dust Free rock wool packing round
  • color: white
  • size: 4mm-50mm
  • Dimensions: 3-50MM
  • Loss On Ignition: 32%
  • Working Temperature: 250-550℃

Packaging & Delivery

Packaging Details plastic woven bag
Delivery Time Shipped in 2 days after payment

Dust Free rock wool packing round

  Product Description

rock wool  Rope The series of rock wool  products handled and exported by our corporation consist of
rock wool  yarns, rock wool  packing, rock wool  tapes, 
compressed rock wool  fibre joint sheets and lubricate rock wool  packing, etc.
Possessing the properties of fireproof, heat insulation, thermal retention, electric
insulation and alkali resistance, these gasket and sealing stuff are essential
to modern machinery, electrical machinery, steamship boiler, electrical engineering
and other industries.

Our rock wool  products are made of high quality materials with skillful workmanship.
With their excellent quality and complete range of specifications, they are warmly
welcomed by customers both at home and abroad.

There are two type of rock wool  fiber yarn, dust free and with dust:
Dust free yarn: composed of around 99% asbestos fiber and 1% chemical powder, color: white, temperature: 550°C
Dust yarn: composed by around 70-85% rock wool  fiber and 15-25% cotton fiber, color:
white, temperature: 250 ~ 550°C, according to quality grade of  rock wool
fiber, it can be divided into five grades: common, A grade, AA grade, AAA grade,
and AAAA grade, different grade has different temperature resistance and tensile
strength, the yarn can be reinforced by glass fiber yarn, brass yarn, and stainless
steel yarn according to requirements.

rock wool  ropes:
1) Made of long rock wool  fiber yarn and braided into round form
2) Extensively used as heat insulation materials on thermal installations and heat
conduction systems operated at temperatures up to 250°C, loss on ignition
32% max.
3) Braided rock wool  round ropes with metallic (copper wire, nickel wire or stainless
wire) are also available
4) Refractoriness: 250 ~ 550°C
5) Refractoriness of dust free asbestos round rope: 480 ~ 550°C
6) Thickness: 3 - 50mm


  Technical Data

performance indexTesting standardTesting result


Main chemical composition



Ai2O3GB/T 6900.445 - 48
Fe2O3GB/T 6900.30.7  - 1.2
CaO+Na2OGB/T 6900.90.43
Max temperature(°c)GB/T 1183 5550
Average OD of fiber (μm)GB/T 5480.42 - 4
Linear Shrinkage ( 550 °c, 24h)(%)GB/T 1183 53.5
Thermal conductivity (478°c, 8pcf)(W/m,K)GB/T 1029 40.130
Shot content (%)GB/T 5480.5<8.5


Packaging & Shipping

Package: woven bag or carton with inner plastic bag


Delivery time: 7~10 days after advanced payment



Certificate of Ruifeng:


Packaging & Shipping

Package(Per Spool) of Graphite And PTFE Packing:


Regular:3m, 8m, 1kg, 1 pound, 2.5kg, 2.5 pound, 5kg, 5 pound,10kg, 10 pound.

Other packages are available on request


Package Choise of Gland Packing:


Ningbo Gongyao Sealing Materials Co., Ltd. is established in 1965. We mainly supply sealing gland packing, asbestos products, fiberglass products, carbon fiber products, ceramic fiber products, expanded graphite products, and PTFE products. 

We are one of the largest manufacturers of sealing, fireproof, and heat insulation in china at present. We have 6,500 square meters building in the south factory, and another 13,300 square meters in the north, with more than 200 skillful employees. Our company invested in Xuxi county of Jiangsu Province at the beginning of 2005, set up a new production base in order to seek development. 

Our enterprise objective is: based on sincerity, the high quality at low price strives for the survival; the technical innovation strives for the development. 

We are sincerely looking for partners to develop and cooperate together in new business opportunities in the principle of mutual benefit. If you are interested in any of our products, please feel free to contact us for more information.


Company Name: 
Ningbo Ruifeng Sealing Materials Co., Ltd.


Operational Address: 
No. 2, Tanghe Road, Kuangyan Town, Cixi, Ningbo, Zhejiang, China (Mainland)




Website on alibaba.com: 




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