In the following letter, a young George Washington writes to Sarah Cary Fairfax regarding a lag in correspondence from her.

宁波安达防腐材料有限公司研制开发的复合型聚乙烯防腐胶带，简称聚乙烯胶带，又称管道防腐胶带，冷缠胶带。产品性能达到国际同类产品水平，质量指标符合美国AWWA C214 与国家SY/T0414的标准要求。2005被中国石油天然气集团公司防腐保温专委会评为防腐优质产品。

产品具有冷缠胶带的特性，施工方便，无环境污染，防腐性能优异，使用寿命长，综合成本低等优点。广泛应用于石油天然气，石油化工，城市燃气，电力供水，冶金造船等管道工程的钢质管道外防腐。

产品系列规格：

Joint wrap tape: Polyethene is used as thebase material which is coated by the liquid butyl rubber film, both of which are pressed and compounded. Usually its pe film is thinner than the one of nti-corrosion tape while the adhesive layer is much thicker. Joint wrap is used on pipe joints,fabrications,bends,fittings and tie bars.

1) T-365 with 0.65mm / 25mil thickness and 50 - 230mm width
2) T-380 with 0.76mm / 30mil thickness and 50 - 230mm width
3) T-3100 with 1.02mm / 40mil thickness and 50 - 230mm width
4) T-3130 with 1.27mm / 50mil thickness and 50 - 230mm width
5) Thickness: 0.40mm - 1.30mm
6) Width can be 50mm, 75mm, 100mm, 150mm, 230mm
7) Length: 30 - 200m

Protective tape (outer tape]:Polyethene is used as the base material which is coated by the liquid butyl rubber film, both of which are pressed and compounded. The film of protective tape is thicker and higher in intensity. Protective tape will protect the pipe and its anti-corrosion tape surface from damages.

Product Specification :
1) The specification of the tape consists of two layers, adhesive and film
2) Inner layer: butyl rubber
3) Outer layer: polyethylene
4) Thickness: 0.40 - 1.30mm
5) Width: 50, 75, 100, 150, 230mm
6) Length: 30 - 200m

Specifications:
1) T-240 with 0.38mm / 15mil thickness and 50 - 230mm width
2) T-250 with 0.51mm / 20mil thickness and 50 - 230mm width
3) T-265 with 0.64mm / 25mil thickness and 50 - 230mm width
4) T-280 with 0.76mm / 30mil thickness and 50 - 230mm width
5) T-2100 with 1.02mm / 40mil thickness and 50 - 230mm width
6) T-2130 with 1.27mm / 50mil thickness and 50 - 230mm width

The tape is consists of two parts:
1. Adhesive: Inner layer of Butyl rubber.
2. Backing: Outer layer of Polyethylene(PE) Plastic.

They can be used in underground,submarine and overhead pipelines to protect pipes against corrosion.

Product Specification :
Type:T-100 series;
Color:Black;
Thickness:15 to 50 mil
Width:2 to 9 inch
Length:30 to 120 yard
Elongation:300%
Tensile:27 to 66 lbs/in

characteristic:
Constant quality under low or high temperature(-30 to 75 centigrade)
Economical long-time solution against corrosion
No cracking and no hardening
Easy application and short working time
Heavy duty adhesive
Complies with AWWA(USA) C-214 standard.
This kind of tape can be applied by hand or with a wrapping machine.