1、BRITISH STANDARD AEROSPACE SERIES BS PL 6:2005 Properties of unsaturated polyester resins for low pressure laminating of glass fibre reinforced composites Specification ICS 59.100; 83.120 BS PL 6:2005 This British Standard was published under the authority of the Standards Policy and Strategy Commit
2、tee on 8 June 2005 BSI 8 June 2005 The following BSI references relate to the work on this standard: Committee reference ACE/65 Draft for comment 04/30115930 DC ISBN 0 580 45901 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Com
3、mittee ACE/65, Inspection and testing requirements for non-metallic materials, upon which the following bodies were represented: British Hydromechanics Research Group British Plastics Federation Society of British Aerospace Companies Ltd. Co-opted members The following bodies were also represented i
4、n the drafting of this standard, through panel ACE/65/-/64, Structural reinforced plastic: Defence Science and Technology Laboratory Co-opted members Amendments issued since publication Amd. No. Date Text affectedBS PL 6:2005 BSI 8 June 2005 i Contents Page Committees responsible Inside front cover
5、Foreword ii 1S c o p e 1 2 Normative references 1 3 Terms and definitions 1 4 Material 2 5 Properties 2 6 Quality of material 5 7 Marking, labelling and packing 5 Annex A (normative) Preparation of laminates 6 Table 1 Physical properties of the resin and resin system 3 Table 2 Mechanical properties
6、of laminates 4 Table 3 Electrical properties 4BS PL 6:2005 ii BSI 8 June 2005 Foreword This British Standard has been prepared under the direction of ACE/65/-/64. With BS PL 7, this document supersedes DTD 5549 July 1961, which was declared obsolescent by the Ministry of Defence from 1st April 1999.
7、 Test methods associated with this specification are published separately as BS PL 7. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user f
8、rom legal obligations relating to health and safety at any stage. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity
9、 from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 6 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.BS PL 6:2005 BSI 8 June 2005 1 1 Scope This British St
10、andard specifies requirements for unsaturated polyester-type synthetic resins (modified or unmodified), with a suitable curing agent for use in the impregnation of glass fibre, and capable of being moulded at low pressure during the curing process. NOTE Modified resins may contain constituents such
11、as thixotropic agents, fire retardants, pigments and fillers. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the reference cited applies. For undated references, the latest edition of the referenced documen
12、t (including any amendments) applies. BS 3396-3, Woven glass fibre fabrics for plastics reinforcement Part 3: Specification for finished fabrics for use with polyester resin systems. BS 6580, Specification for corrosion inhibiting, engine coolant concentrate (antifreeze). BS 2L 504, Specification fo
13、r sheet and strip of magnesium 3 % zinc-zirconium alloy (Zn 3.0, Zr 0.6). BS 6L 17, Sheet and strip of 99 % aluminium (temper designation 0). BS PL 7, Unsaturated polyester resin for low pressure laminating of glass fibre reinforced laminates Test methods. BS STA 18, Services specification for brass
14、 strip for QF and SA cartridge cases and for caps. Def Stan 03-19, Electro-deposition of cadmium. Glasgow: UK Defence Standardization. Def Stan 91-48, Hydraulic fluid, petroleum: superclean. Glasgow: UK Defence Standardization. Def Stan 91-98, Lubricating oil, gas turbine engine, synthetic grade 7.5
15、 cSt. Glasgow: UK Defence Standardization. DTD 406B, De-icing fluid. Glasgow: UK Defence Standardization. DTD 911C, Protection of magnesium-rich alloys against corrosion. Glasgow: UK Defence Standardization. Mil-S-81087C, Silicone fluid. USA: US Army Petroleum Center. 3 Terms and definitions For the
16、 purposes of this British Standard, the following terms and definitions apply. 3.1 low-pressure moulding process in which the applied pressure during the curing operation is within the range of 0 to 1.4 MPa 3.2 unsaturated polyester resin solution of styrene (or other reactive monomer or mixture of
17、monomers) of a polymer in which the structural units are linked by ester groupings obtained by condensation of one or more polycarboxylic acids (and if desired a minor portion of a monocarboxylic acid) with one or more polyhydric alcohols (and if desired a minor proportion of a monohydric alcohol).
18、At least one of the acids or alcohols is ethylenically unsaturated 3.3 curing agent additive such as a catalyst and/or an accelerator added to the base resin to enhance the rate of curing 3.4 resin system resin catalyst and/or accelerator mixed in ratios as specified within the manufacturers control
19、led documentationBS PL 6:2005 2 BSI 8 June 2005 3.5 storage life shelf life time period at a specified temperature under which the resin/curing agents, stored in their original unopened containers when tested will meet the requirements of this specification 3.6 pot life time period between mixing th
20、e resin and the resin setting to a soft gel, during which the resin is in a workable state 3.7 curing cycle time/temperature/pressure application profile, including rate of heat up and cool down as specified within the manufacturers controlled documentation 4 Material 4.1 Manufacturing control The r
21、esin shall be formulated and manufactured to issue-controlled documents, which shall form part of the contract between purchaser and manufacturer. Changes to the formulation or manufacturing process shall not be made without due consideration being given that the modified material meets all the requ
22、irements of the standard. 4.2 Grades and options The resin shall be supplied as: Grade M, for use where mechanical properties only are of primary importance; or Grade E, for use where both mechanical and electrical properties are of primary importance. 4.3 Classification and coding Each grade of res
23、in shall be classified according to maximum service temperature. Class MA and EA, for use at temperatures not exceeding 70 C. Class MB and EB, for use at temperatures not exceeding 90 C. Class MC and EC, for use at temperatures not exceeding 150 C. Class MD and ED, for use at temperatures not exceed
24、ing 200 C. Class MF and EF, for use at temperatures not exceeding 260 C. 5 Properties 5.1 Resin and resin system physical properties The resin and resin system shall meet the requirements specified in Table 1 when tested in accordance with BS PL 7. The manufacturer shall specify: a) the proportions
25、of individual constituents within the catalysed resin system; b) the mixing sequence; and c) the maximum pot life of the catalysed resin at an ambient temperature of 25 C. The resin shall meet the requirements of Table 1 when stored in its original sealed tin at a maximum temperature of 25 C for a t
26、ime period specified by the manufacturer. The resin shall meet the requirements of Table 1 when stored in its original sealed tin at a maximum temperature of 40 C for a time period specified by the manufacturer.BS PL 6:2005 BSI 8 June 2005 3 Table 1 Physical properties of the resin and resin system
27、5.2 Laminated resin system physical and mechanical properties Laminate test plaques shall be manufactured in accordance with Annex A using glass fabric to BS 3396-3 S2/22 grade S. They shall meet the requirements of Table 2 when tested in accordance with BS PL 7. After conditioning the cast resin pl
28、aque for not less than 40 h at (23 2) C and (50 5) % RH, determine the Barcol hardness in accordance with the requirements of BS 2782-10: Method 1001. Test specimens showing signs of damage such as cracking, crazing, delamination or other signs of physical damage resulting from preparation or condit
29、ioning shall not be tested. Material Test Test requirement Resin Density at 25 C Nominal value 0.01 % Viscosity at 25 C Nominal value 30 % Acid value, mg KOH/g Nominal value 4 % Resin system a Gelation time at 25 C Nominal value 30 % Gelation time at 82 C b Nominal value 30 % Change in viscosity wit
30、hin stated storage life 30 % of initial value Change in gelation time within stated storage life 30 % of initial value NOTE Nominal value is that value specified by the manufacturer in the controlled documentation for the material a The resin system shall be fully catalysed in accordance with the ma
31、nufacturers instructions. b Material subjected to a room temperature or curing process below 82 C shall not be subjected to the gelation test at 82 C.BS PL 6:2005 4 BSI 8 June 2005 Table 2 Mechanical properties of laminates 5.3 Electrical properties Laminate test plaques shall be manufactured in acc
32、ordance with Annex A using glass fabric conforming to BS 3396-3 S2/22 grade S and E type resins. They shall meet the requirements of Table 3 when tested in accordance with BS PL 7. Table 3 Electrical properties Test Test requirement Flexural strength, MPa (minimum) 380 Initial modulus of elasticity
33、in flexure To be recorded Flammability, mm/min (maximum) 25 Glass content To be recorded Resistance to water a) flexural strength after immersion, MPa (minimum) b) initial modulus of elasticity after immersion c) absorption of water, mg (maximum d) leaching in water, mg (maximum) 310 To be recorded8
34、05 Flexural strength after heat ageing, MPa (minimum) a a) after (30 1) min b) after (192 4) h 138 172 Flexural strength after weathering and heat ageing, MPa (minimum) a a) after (30 1) min b) after (192 4) h 103 138 Resistance to fluids b a) retention of flexural strength, per cent of original val
35、ue (minimum) b) change in weight, per cent of original value80 0.5 Determination of corrosive nature in presence of metals, mg c Loss in weight to be recorded a Heat ageing shall be carried out at the maximum service temperature for the grade of resin under test. The tolerance on ageing temperature
36、shall be 2 C for temperatures up to and including 150 C, and 5 C for all other temperatures. b Resistance to fluids shall be determined by conditioning test specimens in the following aircraft fluids: a) hydraulic oil petroleum base conforming to Def Stan 91-48; b) de-icing fluid conforming to DTD 4
37、06B; c) inhibited ethylene glycol conforming to BS 6580; d) standard rubber test fluid mixture of 30 parts by volume of pure toluene (analytical reagent quality) and 70 parts by volume of pure iso-octane (2,2,5-trimethyl pentane); e) lubricating oil conforming to Def Stan 91-98; f) chlorinated silic
38、one fluid conforming to Mil-S-81087C. c Freedom from corrosive substances shall be determined by testing with the following metals. a) mild steel, cadmium plated and passivated, conforming to Def Stan 03-19; b) brass conforming to BS STA 18; c) aluminium conforming to BS 6L 17; d) magnesium alloy co
39、nforming to BS 2L 504 treated to DTD 911C Bath 3. Test Test requirement Before storage After storage for 21 days at (20 2) C and (90 2) RH in an enclosed chamber Permittivity 4.4 (maximum) 5.5 (max) and not more than 25 % higher than before storage Loss tangent 0.02 (maximum) 0.025 (max) and not mor
40、e than 25 % higher than before storageBS PL 6:2005 BSI 8 June 2005 5 6 Quality of material A representative sample of each manufactured batch of resin and curing agent shall be tested for density, viscosity, acid value and gelation tests at 25 C and at 82 C in accordance with the requirements of Tab
41、le 1. 7 Marking, labelling and packing 1) The labelling of the resin shall consist of the following details in the following order: a) the number and date of this standard i.e. BS PL 6:2005; b) the classification of the resin, e.g. Class MA; c) the manufacturers name or trade mark, e.g. AB and Co.;
42、d) the date of manufacture; e) the batch number; f) the preferred storage temperature; g) the maximum storage life in months from date of dispatch. 1) Marking BS PL 6:2005 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufac
43、turer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party certification of conformity.BS PL 6:2005 6 BSI 8 June 2005 Annex A (normative) Preparation of laminates Cut 12 pi
44、eces of fabric of approximate size 300 mm 300 mm. Cover two suitable flat plates (400 mm 400 mm) with a sheet of regenerated cellulose film or a suitable release film or release agent. Dry the glass fabric in a ventilated oven for a minimum of one hour at (100 5) C, cool it in a desiccator and use i
45、t immediately on removal. Carry out both the impregnation and building up of the laminate in a room temperature of 17 C to 25 C. The warp direction of the fabric in any ply shall be parallel to the weft direction in the adjacent ply of the laminate. Impregnate the fabric with resin to give a final g
46、lass content of 60 % to 65 % of the total weight. The wet impregnated fabric shall be uniformly translucent to demonstrate thorough impregnation. Based on the weight of glass fabric to be used, catalyse an excess weight of resin (for example 1.5 times the weight of fabric) to produce a void-free lam
47、inate. Catalyse the resin in accordance with the manufacturers instructions and use it immediately in the following manner. Pour approximately one twelfth of the catalysed resin on to the cellulose film and place one ply of glass fabric on top. Using a knife blade squeegee roller or other device, ap
48、ply pressure to the fabric until it is wetted with resin and becomes evenly coated and uniformly translucent. This operation shall be performed with one to two minutes per ply. Repeat the same procedure rotating the ply 90 in relation to the previous layer. Immediately cover the top ply with cellulo
49、se film and the second flat plate. Place stops three millimetres thick between the upper and lower plates. Within five minutes of completion of the assembly, place the completed assembly between platens of a press, close and adjust it to apply a positive pressure of 0.05 to 0.10 MPa. Cure in accordance with the manufacturers instructions. If required, carry out post cure in
