PTFE 标准复合材料

最常见的PTFE复合材料以玻璃纤维、青铜、石墨、碳为填料。相关图表中的数值通过对模压和挤压工艺的分析获得。最左列汇总了纯PTFE G400的基本数据，以便与不同复合材料的数值进行比较。

可供选择的"G"系列复合材料 - 填料及其功能

除纯PTFE G400产品外， GUARNIFLON® 还提供多种复合材料产品。
这些复合材料直接在Guarniflon® 复合单元中以精选聚合物和特种高纯填料为原料加工而成，终端用户可从中找到满足其技术要求的解决方案。为便于选择，以下表格总结了：

下表展示了每种填料对物理和机械性能的影响方式。
两种或多种填料的组合（表中未涉及）可产生大量复合材料，从而提供多种应用的组合性能。


Filler	Property	Most common applications
Glass	Enhanced wear resistance. Enhanced chemical resistance (except for alkali and hydrofluoric acid).	Valve seats, seals, bearings, requested to resist sliding and chemicals. Suitable for bearings working at low PV values.
Graphite	Extremely low coefficient of friction. Fairly good compressive strength. Good wear resistance.	Bearings for high speed on fairly hard surface.
Carbon	Good thermal conductivity. Good resistance to deformation.	Valve seats. Bearings for high speed and when fast dissipation of electric charges is needed. Elastic bands for unlubricated compressors.
Molibdenum disulphide	Enhanced non-stick properties. Low static coefficient of friction. Fairly good resistance to deformation.	Guide bands. Details needing good resistivity.
Bronze	Enhanced compressive strength. Good wear resistance and high thermal conductivity.	Anti-extrusion rings. Unlubricated bearings for high speed on not hard surface.

Guarniflon® 可提供极为广泛的G系列复合PTFE削切胶带、板材、挤压和模压棒材及管材。尺寸及相关公差包含在尺寸手册中。胶带、板材和成品可提供蚀刻处理。


Property	Test method	Unit	Virgin	G Standard Compounds
			G400	G403 15% GLASS FIBER	G405 25% GLASS FIBER	G412 15% GRAPHITE	G415 25% SOFT CARBON	G453 25% CARBOGRAPHITE	G458 60% BRONZE 2% CARBON
Moulded
Specific gravity	ASTM D792	g/cm3	2.14 - 2.18	2.19 - 2.22	2.20 - 2.26	2.10 - 2.15	2.05 - 2.11	2.05 - 2.11	3.75 - 3.93
Coefficient of linear thermal expansion 25-100¡C	ASTM D696	10-5 (mm/mm)/¡C	12 - 13	11 - 13	7.5 - 11	8 - 10	9 - 12	10 - 12	7 - 8
Hardness Shore D	ASTM D2240	Punti	≥51	≥60	≥70	≥ 55	≥ 60	≥ 64	≥ 62
Tensile strength	ISO 527	N/mm2	≥24	≥17	≥17	≥18	≥15	≥14	≥15
Elongation at break	ISO 527	%	≥250	≥250	≥230	≥200	≥150	≥90	≥100
Compressive strength at 1% deformation	ASTM D695	N/mm2	4 - 5	6 - 7	8 - 9	6.5 - 7.5	7 - 9	7 - 9	10 - 11
Deformation under load (24 h 13.7 N/mm2 23¡C	ASTM D621	%	≤17	≤14	≤10	≤10	≤6.5	≤7	≤6
Permanent deformation (as above after 24 h relaxation)	ASTM D621	%	≤9	≤7	≤6.5	≤6	≤4	≤5	≤2.5
Kinetic coefficient of friction	ASTM D1894	/	0.03	0.12	0.13	0.07	0.13	0.11	0.13
Wear factor at PV 100	ASTM D3702		2.900	10 - 20	10 - 15	60	20 - 30	16 - 20	10
Extruded
Specific gravity	ASTM D792	g/cm3	2.14 - 2.18	2.18 - 2.21	2.18 - 2.26	2.09 - 2.14	2.04 - 2.10	2.04 - 2.10	3.80 - 3.88
Hardness Shore D	ASTM D2240	Punti	≥40	≥ 60	≥60	≥ 55	≥ 60	≥ 64	≥ 65
Tensile strength	ISO 527	N/mm2	≥20	≥15	≥13	≥ 14	≥15	≥12	≥13
Elongation at break	ISO 527	%	≥ 200	≥200	≥180	≥150	≥50	≥50	≥80

设计用性能

与PTFE混合的填料可改善纯聚合物的某些基本物理性能，优势如下：

机械性能

谈及材料机械性能时，抗拉强度和断裂伸长率通常是首要关注的指标。然而，这两个最常见的性能并不总能准确反映材料在某些应用中的实际表现，而抗压性能实际上才是最重要的指标。我们重点关注在设定变形量下的抗压强度、恒定载荷下的变形量以及在设定温度下的永久变形。